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OS MasterMap user guide: product specification v5.1

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1. 2 2004 O Crown copyright Page 181 line The straight line segment between two given points Not to be confused with polyline or line segment feature line feature The OS MasterMap abstraction of a linear object such as a wall or riverbank The geometry of a line feature is a polyline an ordered string of points A particular line feature will often represent only part of an object For example a line feature may represent a linear entity for example part or all of a fence the boundary of an area for example a house or both for example a fence around a field local holdings The situation where a customer has to hold and manage data that is supplied to them make An attribute indicating whether the land surface is natural or man made See the Reference section OS MasterMap user guide media supply See off line supply metadata Graphical or textual information about the content quality condition origins and characteristics of data National GPS Network The infrastructure of active and passive GPS reference stations that allow surveyors to determine precise coordinates in GPS and British National Grid spatial reference systems The National GPS Network provides the physical definition of the British National Grid the primary spatial reference system used in OS MasterMap A central component of the Digital National Framework National Grid A unique referencing system that can be applied to all Ordnance Survey
2. Access Prohibited To vehicleQualifier type exceptFor True Emergency Vehicles RR a OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 98 No Motor Vehicles or motorcycles 8 am to 6 pm except buses taxis and permit holders The restriction is an Access Prohibited To for the specified vehicles dateTimeQualifier n a environmentQualifier instruction Access Prohibited To vehicleQualifier type exceptFor True Buses use exceptFor True Taxis use exceptFor True Permit Holders One way street for buses only The restrictions here are one way and access limited to buses two features are captured Feature one Feature two dateTimeQualifier dateTimeQualifier n a n a environmentQualifier environmentQualifier instruction One Way instruction Access Limited To vehicleQualifier vehicleQualifier n a type exceptFor False Buses Note the vehicleQualifier for the Access Limited To has the exception set to false to indicate that it applies to Buses as a vehicle type only In this example all other vehicles are not subject to the restriction therefore it is inferred that there is no access to any vehicles other than those specified buses RR a a OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 99 Permit holders only The restriction is Access Limited To permit holders dateTimeQualifier
3. This functionality will enable the import of polygons or lines in the formats listed below Please note that constraints will apply depending on the size of polygon or line you wish to import You may also find that the specification of your PC and browser affects the ability to edit the polygon s once loaded Acceptable formats e GML v2 1 2 we only accept polygons in this format not lines e Mapinfo8 MIF version 6 or later e ESRI Shape Arcview 3 2 or later e DXF release 12 or later Constraints The maximum number of nodes in a polygon s is 50 000 For example e You can import one polygon containing 50 000 nodes or multiple polygons with a combined total of 50 000 nodes e The maximum number of nodes in a line or network is 10 000 e The maximum width of a buffer that can be applied to a line is 10 000 metres a AE OS MasterMap user guide product specification chapter 1 9 v5 1 2 2004 Crown copyright Page 118 Initial supply change only update and re supply can be supplied for the whole of the user s selected contract area or ordered by subset It is chunked to allow supply as manageable sized files see Chunking supply of data in chapter 1 9 e The layer themes of data required Features that form part of several selected topography themes are supplied only once Some themes are dependent on others being selected e The licence period you wish to use the data for e The number of terminals you will be usi
4. What is supplied unclipped data Topographic data The following diagram shows how topographic data that overlaps the data selection polygon is supplied You will notice that the data is unclipped that n River supplied whole length is the line features of both independent and unti broken by another feature ee is topological see the Reference section for example a bridge or the outside the selectio OS MasterMap user guide polygon features rivers ends ao x that overlap the selection polygon are x supplied in their entirety The only difference is that the attribution of those line features that are entirely outside the selection polygon is not Hausa eupplied ii supplied with independent polygons but is its entirety as part with topological polygons Data of it falls within selection selection polygon The building that crosses the selection polygon polygon However the garage does not has both its area and bounding line features so is not supplied supplied as does the inferred property it lies within However the adjoining garage is not supplied as none of its walls fall within the selection polygon except for the wall adjoining the house The garage will appear as a hole in Road supplied until the property area feature it meets junctions Other features are supplied in the same way such as roads and rivers Address data Address features have a single point position and if that coordinate
5. AQL an average of 0 6 category A units of change per 0 25 km in urban areas and per km in rural areas over six months old remains unrevised Generally no known task that is in excess of 10 units of change and over six months old will remain unrevised Rural and moorland areas will be subject to a programme of cyclic photogrammetric revision known as the national sweep Categories A and B see appendix B will be surveyed and made available within OS MasterMap AQL an average of 4 0 units of change per km in rural moorland areas including 0 6 category A units of change may remain unrevised Generally no individual km in rural and moorland areas will contain more than 15 units of change uncaptured that were in existence at the date of the photography used to revise the data Category C data will normally only be revised when required to logically complete revision of category A or B detail see appendix B Correction We aim to survey within three months of notification by a customer any category A change not surveyed within six months of the change occurring on the ground Any uncaptured category B change that was in existence at the date of the photography used for cyclic revision will generally be subject to remedial action within six months of notification OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 148 Improvement Ordnance Survey is seeking to continually imp
6. Fire ambulance and police services are able to instantly identify the location of an address to increase their response times in emergency situations Since the Address Layer is compatible with other layers in OS MasterMap it is a powerful tool in managing insurance risk or in analysing environmental impacts of new engineering developments such as road building or the development of waste disposal sites OS MasterMap is the most powerful land and property management tool available covering all of Great Britain coupling the precise location of PAF addresses and a unique referencing system for non addressable properties RRR A a OS MasterMap user guide product specification chapter 1 5 v5 1 2 2004 Crown copyright Page 53 From routing and scheduling in traffic management through to the provision of location based services the Address Layer defines the relationship between service and customer and this can be used to save time and money General principles PAF The PAF contains postal address data for approximately 26 million Delivery Points These Delivery Points may be premises that are shown on OS MasterMap such as buildings or they might be features that do not form part of the Topography Layer specification such as PO Boxes caravan parks buildings under railway arches temporary buildings and houseboats All valid addresses in PAF to which coordinates can be allocated will be in the Address Layer Ordnance Survey do not
7. Referred RR A a OS MasterMap user guide product specification chapter 1 5 v5 1 2 2004 Crown copyright Page 60 Chapter 1 6 Imagery Layer The OS MasterMap Imagery Layer adds a visualisation and contextual capability to the other vector data layers in OS MasterMap It has many uses and applications in areas such as property insurance risk analysis asset management land use analysis agricultural land use and crops inventory vegetation cover property management planning applications route planning and accessibility assessment and location based services Figure 1 6 1 Example of the Imagery Layer As the use of geographic information and GIS spreads to a wider community of users imagery has an important part to play with its powerful visualisation properties especially for users who are less familiar with map based presentation In addition it has the valuable ability to expose additional detail including small temporary or unmapped items such as road furniture car park spaces foliage moored boats or cleared development sites Combined together these two properties are frequently useful for site evaluations vegetation studies and environmental analysis without the need for costly site visits OS MasterMap user guide product specification chapter 1 6 v5 1 2 2004 Crown copyright Page 61 Ordnance Survey has set the specification and quality levels for the OS MasterMap Imagery Layer with the aim of providing a reli
8. RoadNode from Road Network RoadLink from Road Network A a 1 pa A im if N f FerryTerminal from Road Network xy lan TopographicArea from Topographic OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright from Road Routing Information RoadRoutelInformation from Road Routing Information BS RoadPartialRouteInformation from Road Routing Information Page 80 Qualifiers The nature and applicability of RRI features is supplied by the use of qualifiers on each RRI feature Routing information is divided into three main areas that provide information about what the information is to whom it applies and when it is applicable These are known as the date time vehicle and environment qualifiers Routing nformation O 0 n 1 dateTimeQualifier vehicleQualifier environmentQualifier e The nature of the RRI is recorded by the use of an environmentQualifier e To whom the RRI applies is defined by a vehicleQualifier e When the RRI applies is defined by a dateTimeQualifier e An environmentQualifier is always required e A dateTimeQualifier is optional and if not present then the routing information applies at all times e A vehicle
9. any modification to a point feature as a result of real world change will result in the deletion of the original feature and creation of a new feature unless there is a clear reason to identify the resultant real world object with the original This applies to both geometric change and change of descriptive group or descriptive term Modification of point features due to error correction When a point feature is found to be incorrectly attributed due to an error or is moved due to the correction of a positional accuracy error the original feature is retained appropriately modified and with an incremented version number a EA OS MasterMap user guide product specification chapter 1 8 v5 1 2 2004 Crown copyright Page 111 Address feature lifecycle rules Creation of AddressPoint features The Royal Mail creates new addresses within the PAF update of which is supplied monthly to Ordnance Survey Following processing into Ordnance Survey systems a new AddressPoint feature is created in OS MasterMap This feature will be automatically matched to an approximate position based upon the correlation between its postcode and other AddressPoint features with similar or identical postcodes In time the match may be improved by Ordnance Survey to a more accurate position this would be classified as a modification of an existing AddressPoint feature Deletion of AddressPoint features When the Royal Mail decides that an address no longer rec
10. e ward A textual description is used for clarification If the alignment of an administrative boundary coincides with any other feature other than another boundary then both will be shown in their respective themes RRR a a OS MasterMap user guide product specification chapter 1 4 v5 1 2 2004 Crown copyright Page 39 Buildings All permanent buildings defined as physical features which it is reasonable to assume will remain in position for at least 10 years whose plan outline covers an area of 8 m or more are captured unless within private gardens when the minimum size is 12 m Smaller permanent buildings are shown when the building is in such a detached position as to be an important topographical feature it is then exaggerated and shown at minimum size Buildings are always shown regardless of size when the building has been used for a bench mark With a few exceptions for example by describing government offices or hypermarkets no distinction is currently made between residential private public commercial or industrial buildings Physical features shown in the buildings theme e roofed buildings of sufficient size or importance to be shown e mobile or park homes that are permanent residential and have a postal address e archways and covered passageways where the alignment can be determined from outside the building e horticultural glasshouses over 50 m and e covered tanks Features such as cool
11. fence hedge or wall the central alignment is shown at that minimum distance away from the feature e Where one edge of a track is parallel and close to the bank of a water feature the track edge nearest to the river is omitted Structures The Topography Layer contains information relating to all permanent structures that are large enough to be included LD SI o Mooring Posts 4 taraira Sege Figure 1 4 3 Examples of real world objects in the structure theme OS MasterMap user guide product specification chapter 1 4 v5 1 2 2004 Crown copyright Page 46 Physical features in the structure theme include e detached monuments e gas holders e cooling towers e fountains e double walls e upper levels of communication and e covered reservoirs pontoons e bridges viaducts aqueducts and piers e pylons e uncovered tanks e weirs and sluices e conveyors Terrain and height For the latest information on transformations and control visit the Ordnance Survey web site at www gps gov uk The Topography Layer shows three types of control point e Triangulation stations these are physical marks that represent one point in the national triangulation scheme The best known form is the triangulation pillar often found on hill or mountain tops Please note that more up to date and detailed information about a triangulation station may be held by Ordnance Survey The coordinates of a triangulation sta
12. 115 EST SM lb AAA TT 116 TG OO iii a ale Osio 116 Routing into MON aia 116 Chapter 1 9 Guide to Using the OS MasterMap data elec ds 117 Minimum system requirements for the data Selector ooooncocinoccccnnnocccononnncnonncnnnnnnncnnnon ono nono nn nana rn nn non rn rr ano n rene nr r nn nn rra ra nnn rr rnann ra ESE EE nt 121 EIEEE E E A o la E E E 122 What is suppled nclhpped Qata coi E A E AA adds 123 Topographic data arson aapa aa A E Aa 123 Address dala aeaee a A A A a a E S 23 TN Roads NetWork datassa pesoi eE EE EE ea LEE a A ai ira nai ETE 124 Imagery Va ceda 25 CRUNKING Supply Of data cti A did 25 Ghange only Update SENICE cda ci n 127 A Gaateitahatamtuscsecvaus seacuadeaasttesccaaiesssadreessusactea aa yeavexcteoetaasetetaacientuaceca asacetaddactravenan setae E 128 Estimate Velicity and ESM OM aa A en eat wd nice nal dos 129 Cookies Security of information provided to the data selector and security of purchasing ONIING eee eter tenets entree eettteeetneeeseneeeree 130 How customer information is protected in the data SeleCtor sesisssriisssiisstititttti inttiin nana o cnn ona cnn n ono n nr naar cr nan nn rra nr rnnn rara 130 0 RARA OS MasterMap user guide product specification contents v5 1 2 2004 Crown copyright Page 8 Password management GUIDANCE irc de ia 130 Chapter 1 10 Data management guidelines 131 U datng your data no NGS lalo iii at 131 Important note about departed features in change
13. 2004 Crown copyright Page 150 Conformity Ordnance Survey continually monitors data collection to ensure that attributes reflect the real world Ordnance Survey will be sampling to establish metrics of the following conformance measures The percentage of descriptive groups that are correct The percentage of change through time attributes that correctly reflect the change that OS MasterMap features have undergone The percentage of newly captured CartographicText that correctly describes the feature Correction Any reported attribute errors are addressed during the normal update cycle or earlier if warranted by their impact on customers business Improvement Ordnance Survey will continue to monitor the data collection processes and to review the specification periodically to reflect customers requirements The 2002 Quality improvement programme will progressively upgrade descriptive terms with the value of unclassified Tracks and unmade paths are not explicitly identified by descriptive group and currently appear in the land theme not the roads tracks and paths theme RRR OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 151 Address Layer Completeness Definition Completeness is a measure of the correspondence between the specified data content for OS MasterMap and Royal Mail s PAF Measurables The measurable is the correlation between the monthly PAF and t
14. 75 Road junctions Not populated in current release Will be available from summer 2004 oooooccocnoccccoooccccooonnccononcncoonnncnnnnnnncnnncnnos 76 Vehicular ferry routes Not populated in current release Will be available from summer 2004 ooococnnnoccccnoccccconoccnconnnnccnoncncn nnnnnos 76 PSM O O NN FEMYN OGG iii oda enone LAA Terminalaren a e aa ATE cy chi Aa Aai nra RAEE AEE nea Aaaa ANa riaa aAA raii A aai Aaa E en ers Road Routing Information RRI Simplification and priority of routing information features onnocnonccnnoncccnononcccnnonnnnnnnn cnn non nc rca nn rc c nao nn anna rn rn aan n rr r narrar rain nrr nana rarnnnnnr Representation of information captured feature ypPES ooconoccccnnnocnnononnncnnonnnnonon ocn a ea aesa EAA ana ener rre rn Daada aAa DE creen Information colncident with Ro adNode Teatures cuina dd Ei e dolia ina Information about a RoadLink where direction of travel is unimportant Information about a RoadLink or number of RoadLinks specific to a given direction Of traVel oonionncninocccnnnnccccnnnnnccnnan canino nncnnnn 79 0 RATA OS MasterMap user guide product specification contents v5 1 2 2004 Crown copyright Page 6 Information about part of a RoadLink where direction of travel is unimportant Information about part of a RoadLink specific to a given direction of travel Relationships between ITN Roads features Qualifiers asise RRI WIth CXCEPtlONS a
15. Daiana de derrita adria iii areas 57 RRR OS MasterMap user guide product specification contents v5 1 2 2004 Crown copyright Page 5 BUIN NAMES neiseina e a ii 57 ES CHIN CAE TALIA SUS ee ice vase So peck AGE Soe oia va eda Pai angie ode sas al E 57 Dependenttioroug Mare ai Aiecudinateccecyadieemiat itaaath ciuns aa ra a aa e eE A e edad dieeatanteaanatedewes 58 Mi O ce E A treater 58 Double dependent locality smin ado atucgnnaniecanmawedeae 58 Dependent localize aE iii 58 ROSETO Meee aaen e a A a a a e e ae E a E E e 58 POSICOJOS O 59 Address AUIS cid 59 addressStatUS iaioa lla oia a Ea aa A ARE irana aaea a Eae EE EE E 59 Struct re TYDE ranee rea a e a a Ea N O I A E E Eare rre Ea rere tree cee reer ree 60 POSIT CMa IY o e e a e ae ae E e e E a a a a a A a 60 physicalStatUS sret ansar deepest nadia 60 mate STATUS ninr ea dd ci il aaia aae N aE SADE bic 60 Chapter 1 6 Imagery Layer A EA A E 61 Mmagemmetadala nai dd 63 Chapter 1 7 MN Roads an ao oia 65 A es AE E EEEE E E A E E E T acetates steele as dmaus des seeps E EEE E EEE 65 Potential USOS capita ai a ceeds a a a be annals a a ae a ea a a a e ia 66 ROAGSTOMIMCIUSIOM kone ea A EE E 66 Representation Of the Toad MEtWOMK cirio tacita ds A Ra Ea Eara Aaa AE a aaa aa e ao 67 Roadmames and NUDE tad eoe iea e old e e aa e a Aa aea e a aare eA eare e aiena 67 erte ge E nME read E E E E E E T T5 R ad INLETS SCTIOMS keien ena iaaa e a aeaea e rae aa kaia aeaa ae an Si eea a E
16. MasterMap user guide product specification appendix A v5 1 2 2004 O Crown copyright Page 177 complex feature A feature that is a collection of other features An example could be a feature representing a river composed of many area and line features representing parts of the river Complex features are not currently a part of OS MasterMap contract The agreement that a customer has for access to Ordnance Survey products and services An OS MasterMap contract will be defined in terms of an area of interest a list of themes a time period the number of terminals the data will be used on and a set of terms and conditions coordinate transformation A computational process of converting an image or map from one coordinate system to another customer An organisation or individual that makes use of Ordnance Survey s data supply facilities This includes both direct sales customers of Ordnance Survey and Ordnance Survey Options as well as customers of Licensed Partners It does not include anyone or any organisation that has access to Ordnance Survey material without charge dataset An identifiable set of data that share common characteristics and that are managed as a subset of the data within a database For example TOPO ROADS and ADDRESS are Ordnance Survey datasets from which the products Land Line OSCAR and ADDRESS POINT are respectively derived deletion 1 The removal of a feature from the OS MasterMap database 2
17. RoadLinks by road features representing DfT numbered roads at roundabouts and junctions Any RoadLink may only be referenced by one DfT numbered Road feature with the exception of Trunk Roads and Primary Routes as described above The following priorities are used to determine how links are referenced at road junctions including roundabouts 1 The road number that Ordnance Survey has information from DfT is applicable to the link 2 If no information is available a hierarchy is imposed where the following priorities are applied Motorway A Trunk A Primary Route A Road B Road Where two roads of equal magnitude meet then the lower numbered route would be used For example the A1 Trunk would be preferred over the A11 Trunk OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 68 Example Numbered roads at a roundabout L In this example in the absence of other information the A27 has priority over the A32 at the roundabout and the RoadLink features are referenced accordingly OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 69 Named Roads A Road feature is created for each named road As there are many roads with the same name for example High Street Road features reference all of the RoadLink features that represent the same named road within an area To achieve this automatically a threshold is applied where
18. The inclusion of the TOID of such a feature as a departed feature in change only update delivery mechanism The method of supply of data to a customer for example off line online departed feature A feature supplied as part of a change only update supply which has either been deleted has changed theme or has moved outside of the area of order since the specified change date a REA OS MasterMap user guide product specification appendix A v5 1 2 2004 O Crown copyright Page 178 descriptive group See the Reference section OS MasterMap user guide descriptive term See the Reference section OS MasterMap user guide digital identifier An identifier that is primarily intended to provide unique and unambiguous feature identification for the purposes of exchanging feature based information between computer systems or associating data within a computer system The Digital National Framework DNF A nationally consistent geographic referencing framework for Great Britain Comprising the National Grid and the National Topographic Database that defines each geographical feature as it exists in the real world with a maintained unique reference allocated to each feature The DNF is not a product it is the framework on which our future products will be based direct sale A direct transaction between Ordnance Survey and a customer direct sale price Those prices that are applied where Ordnance Survey sell OS MasterMap based produc
19. are delivered to the addressee It should be noted that using PO box postcodes within location based searches will identify the position of the delivery office not the addressee RR a a OS MasterMap user guide product specification chapter 1 5 v5 1 2 2004 Crown copyright Page 56 Sub building name and or number The sub building name and or number are identifiers for subdivision of properties For example FLAT 3 Sub building name POPLAR COURT Building name LONDON ROAD Thoroughfare NOTE if the above address is styled 3 POPLAR COURT all the text will be shown in the buildingName field and the subBuildingName and or buildingNumber field will be empty The building number will be shown in this field when it contains a range decimal or non numeric characters see below Building names The building name is a description applied to a single building or a small group of buildings such as Highfield House This also includes those building numbers that contain non numeric characters such as 44a Some descriptive names when included with the rest of the address are sufficient to identify the property uniquely and unambiguously and are included in the Address Layer with no further investigation for example MAGISTRATES COURT Descriptive names in brackets following a distinctive name will only be shown in the Address Layer when they are shown in this form in PAF For example RAILWAY TAVERN PUBLIC HOUSE or THE COURT ROYAL HOT
20. are significantly important and have an outline that is either liable to change or not defined precisely by any surveyable feature for example vegetation limits or man made slopes The nature of vegetation is shown except for trees and scrub bushes brambles and undergrowth growing in permanent water Indefinite detail is not surveyed precisely The accuracy of survey is related to the degree of definition on the ground Topographic feature levels Topographic features within OS MasterMap carry a physical level feature attribute indicating the level at which the feature lies that is underground obscured ground level or a level above ground See the Reference section OS MasterMap user guide for further technical information Cartographic surface level Where one level of detail exists cartographic surface level is the same as general surface level Where more than one level of detail exists the cartographic surface level is defined as the upper surface level of surveyed detail All features surveyed at levels below cartographic surface level are captured using obscured detail or underground detail feature codes RR a OS MasterMap user guide product specification chapter 1 4 v5 1 2 2004 Crown copyright Page 33 Ground surface level The definition of ground surface level is usually self evident Where more than ne sort 1 i one level of detail exists ground m Merryorook L surface level is defined as the l
21. area of mapping within the data selector you may tick the Topo layer feature density check box to overlay the density model onto the mapping The colouring will vary from a very pale colour for a low TOID density area such as the Highlands of Scotland to a deep dark colour for the highest TOID density areas such as London The feature density layer box works like a toggle switch and must be ticked on or off to access the overlay You should then save your estimate and should you wish to convert it to a contract this can be done online Estimates are valid for 30 days or until the next price change is implemented if sooner but are held for six months and can be recalled to set up your contract or to be amended Saved estimates should always be recalculated before converting to a contract if they have been saved for longer than 30 days in case of price changes After ordering data to be delivered online via the FTP server you will be sent an email informing you when the data is ready to be downloaded For customers with small orders the option of FTP supply will be available while larger orders will be supplied on either CD or DVD a EA OS MasterMap user guide product specification chapter 1 9 v5 1 2 2004 Crown copyright Page 120 The OS MasterMap data selector can be accessed at any time although support is only available between 08 30 and 17 30 hours weekdays excluding Bank Holidays using your user name and password which were e
22. but which are part of the geometry of area features inside the supply polygon are also supplied This ensures that the full geometry of all area features that overlap the chunk edge is available in each chunk A consequence of this is that some features are supplied in more than one chunk Systems reading OS MasterMap data must identify and deal with these duplicated features This applies not only to line and polygon features but also to features with point geometry that is AddressPoint TopographicPoint CartographicPoint and CartographicText features This is because the query used to populate a chunk file includes all features that touch its boundary and this boundary is shared with adjacent chunks Address features are the exception Although Address features reference the building TopographicArea feature in which the AddressPoint lies it is possible for the TopographicArea feature to be supplied in an OS MasterMap GML file without the AddressPoint feature when both buildings and Address themes are requested This happens when the TopographicArea feature intersects the chunk file boundary but the address feature is outside it In this case the Address feature will be found in an adjacent chunk file unless the chunk in question is on the boundary of the supplied area You should therefore ensure that whole buildings that hold the addresses you require are included when drawing your selection polygon in the online service Empty chunks are
23. by a FerryLink This feature does not have geometry itself but is a logical link between the locations where a ferry allows vehicles on and off the ferry A FerryLink feature necessarily includes references to the FerryNode features that represent its start and finish point FerryNode The ends of a FerryLink this may indicate part of a ferry route for multi stage services are represented by a FerryNode These features represent the general location of the end of a FerryLink and have a single point position A FerryNode feature may serve multiple FerryLink features if more than one destination is served from the same general location Because FerryLink features do not have geometry of their own they cannot intersect in the way RoadLink features do therefore FerryNode features will only ever exist at a location where vehicles or people are permitted on and off the ferry OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 76 FerryTerminal The ferry and road networks are linked by a FerryTerminal feature which represents where a potential change of mode of transport occurs from a road vehicle to ferry or vice versa A FerryTerminal feature has no geometry but simply provides a logical link between the road and vehicular ferry networks Road Routing Information RRI RRI is information about a route that may affect a driver s choice of route It could be either restriction information such
24. centre of the flowchart New Changed Removed real world real world real world object object object Is it still the same real world object N Yes Retain feature Delete feature Create new update version Create new Delete feat feature version 1 P Cielo Teale number feature version 1 Creation of area features due to real world change When a new real world object represented as an area feature such as a pond a building or a land parcel comes into being a new area feature is created in the data with a new TOID and a version number Users with local holdings of OS MasterMap data will be informed of new features in their holding via change only data update Deletion of area features due to real world change When a real world object represented as an area feature no longer exists in the real world the area feature is deleted from the database A record is kept in the database to indicate that a feature with this TOID used to exist Users with local holdings of OS MasterMap data are informed of the deletion in their next change only data update a AE OS MasterMap user guide product specification chapter 1 8 v5 1 2 2004 Crown copyright Page 104 Modification of area features due to real world change When a real world object represented as an area feature changes but is considered to be still the same real world object the corresponding modified feature is retained in the database The version number is increm
25. classified as Primary Routes or Trunk Roads by the DfT Unnamed and unnumbered roads are included as RoadLink features but are not referenced by a Road feature Numbered roads Road features representing DfT numbered roads reference all of the RoadLink features that represent that classified road These links may not be contiguous either across junctions and where a classified road consists of separate sections they may be separated by some considerable distance Trunk Roads and Primary Routes are captured as independent Road features that include an attribute that describes them appropriately They reference only the links that represent their geometry This results in two numbered road references to the same link s in this case the number will be the same but one feature will have an additional attribute describing it as a Trunk Road or Primary Route RRR a a OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 67 Example Road Feature Road Feature A303 A30 Primary A303 A303 Primary A30 A30 A30 A30 Road Feature A30 In this example the A303 Primary Route joins the A30 the A30 then becomes a Primary Route Three features are required e the A30 representing all RoadLinks part of the A30 e the A303 Primary representing all RoadLinks part of the A303 Primary Route and e the A30 Primary representing the subset of the A30 that is classified as a Primary Route Reference to
26. containing file references to the chunking of the data and other relevant information a AE OS MasterMap user guide product specification chapter 1 9 v5 1 2 2004 Crown copyright Page 119 e Your data will remain on our FTP server for seven days for collection after which time it will be deleted It is not possible to remind customers to collect their data or to resurrect orders Media e Either CD or DVD Readme files will also accompany this data as detailed above e CD media data format the directory and file naming convention used on this media conforms to the ISO9660 format using the Joliet and Rock Ridge file extensions e DVD media data format the directory and file naming convention used on this media conforms to the Universal Disk Format UDF using the Joliet and Rock Ridge file extensions NOTE The formats independent polygons and topological polygons are only relevant if you have ordered polygonised data that is the Topography Layer A purple shaded overlay based on the feature density model is available for use within the user defined polygon sections of the data selector to give you a visual representation of the Topography Layer TOID density for any area The cost of the data is related to the density of TOIDs within your selected area The greater the TOID density the higher the cost of the data Address and ITN Roads network TOIDs are not included in the feature density model Once you have selected an
27. diagram have a descriptiveGroup attribute with the value Building so they pass the rule to be members of the buildings theme They do not pass the rules of any other themes based on their own attribution The line feature coloured orange in the diagram has a descriptiveGroup attribute with the value General so it passes the rule to be a member of the land theme It does not pass the rules of any other themes based on its own attributes RR OS MasterMap user guide product specification chapter 1 3 v5 1 2 2004 Crown copyright Page 25 The three line features are then placed in the themes of the area features they bound giving the final assignment of features to themes shown in the diagram below Buildings Buildings e Roads tracks and paths e Buildings Land Roads tracks and paths e Roads tracks and paths OS MasterMap user guide product specification chapter 1 3 v5 1 2 2004 Crown copyright Page 26 Chapter 1 4 Topography Layer Overview The Topography Layer of OS MasterMap represents real world objects such as buildings kerb lines fences and letter boxes as well as intangible objects such as county boundaries or the line of mean high water See figure 1 4 1 Real world objects are represented as a series of area point line and text features within OS MasterMap Ground relief features are only shown where they represent a serious hazard to passage on foot These are features
28. each time there is change of any kind to the feature in the Ordnance Survey database see Chapter 1 8 Life cycles of OS MasterMap features The change that causes a version number increment can be to the feature geometry or the feature attributes and can be due either to real world change or to processes not connected with real world change such as error correction or geometric cleaning and structuring In a small minority of cases a new version of a feature can be created without any change apparent to the user This is due to change to private attributes that the OS MasterMap database holds but which are not included in product data The classification of OS MasterMap features is based on the feature type and feature description attributes More information on feature classification can be found in the Reference section OS MasterMap user guide Inferred links OS MasterMap data also includes inferred links see Chapter 1 12 OS MasterMap quality statements which are not TopographicLine features inserted to provide a more useful subdivision of area features These occur in situations where TopographicLine features do not serve this purpose The most common examples are the division of private gardens where no physical boundary exists and the division of roads into sections at junctions These links represent inferences about the real world based only on the topographic map information not on any other sources of fact Inferred links in private
29. errors ideally within one month but within a maximum of three months Improvement Ordnance Survey will continue to monitor processes and to review the update of OS MasterMap addresses periodically to meet customers requirements RRR a OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 153 Temporal validity currency Definition Currency is a measure of the percentage of addresses matched to a final real world position with respect to the total number of addresses in the PAF Measurables Ordnance Survey measures the percentage of addresses matched to a final position at both a national and postcode sector level Conformity A minimum of 95 of addresses will be matched to a final position in every postcode sector e in 96 of Urban postcode sectors at least 97 8 of addresses will be matched to a final position e In 96 of Rural postcode sectors at least 97 0 of addresses will be matched to a final position It should be noted that there will be a delay between PAF update being loaded and the match process being completed Therefore the percentage of addresses matched to a final position will vary within the update cycle Correction Any reported errors of comission or omission are addressed by Royal Mail or Ordnance Survey Ordnance Survey will endeavour to rectify errors within its remit ideally within one month but within a maximum of three months Improvement Ordn
30. falls within the data selection polygon then the feature is supplied 0 ae CCC CTD OS MasterMap user guide product specification chapter 1 9 v5 1 2 2004 Crown copyright Page 123 ITN Roads network data The following table defines how ITN Roads network data is supplied in relation to the data selection polygon Feature type Road RoadLink RoadNode InformationPoint FerryLink FerryNode FerryTerminal RoadNode Information RoadLink Information RoadRoute Information RoadPartialLink Inf ormation RoadPartial Routelnformation Supply rules Any Road feature that refers to at least one RoadLink feature within the area of interest will be supplied All RoadLink features that intersect with the area of interest will be supplied in their entirety RoadLink features referenced by a supplied Road feature but lying outside the area of interest are not supplied RoadLink features referenced by a RoadRoutelnformation feature but lying wholly outside the area of interest are not supplied All RoadNode features within the area of interest will be supplied RoadNode features at the end of RoadLink features that are supplied but that themselves lie outside the area of interest are not supplied All InformationPoint features within the area of interest will be supplied A FerryLink feature that references a FerryNode feature within the area of interest will be supplied A FerryNode feature within the area of interes
31. feature The TOID and the geometry of the feature are both attributes of the feature In GML and XML documents and specifications this term is used in a different way This usage is noted in the OS MasterMap specifications as appropriate attribute set A group of attributes that can legitimately be used together Each feature type uses a particular attribute set change only update COU The ability to supply to a customer only those features that have been created or changed since a specified date Change only supply includes a list of the TOIDs of deleted features In the OS MasterMap context the selection of changed data will be by change since date that is all change since the 00 00 hours on the specified date It is not possible to select change since your last update Therefore the customer system must recognise repeatedly supplied features change since date The date used when requesting change only update that indicates the date since which change is required This will result in the supply of all change in the database since the beginning that is 00 00 of that day chunking The process of breaking up the area of order into manageable physical units of supply that is files for supply to the customer comission Features are captured that do not conform to the specification Features representing departed real world objects remaining in the data commercial service provider See application service provider 0 REE OS
32. features shown in the heritage and antiquities theme e due to the variety of real world objects in this theme they will not all be listed but they do include e standing stones e earthworks hill figures e ruined buildings e tombs and e stone circles Non physical features shown in the heritage and antiquity theme e textual descriptions for the real world objects and e battle sites RR a OS MasterMap user guide product specification chapter 1 4 v5 1 2 2004 Crown copyright Page 41 Constraints imposed by survey principles Many earthworks are of low relief and do not meet Ordnance Survey survey criterion To depict the feature clearly it may be necessary to exaggerate antiquity detail In mountain and moorland areas some antiquity features may be generalised without losing the essential characteristics of the depiction Land The land theme encompasses those areas that do not form part of another theme such as water rail or roads tracks and paths For example a grass verge next to a road would appear in the roads tracks and paths theme whereas a park area would be in the land theme OS MasterMap does not attempt to record the shape of the earth The limits of geographical features such as hills and valleys are not recorded although the distinctive names of these geographical features are shown Physical features shown in the land theme include e parks playing fields football pitches golf courses and so on
33. gardens do not represent property ownership boundaries Seamless data OS MasterMap data is not managed as map tiles but as a seamless representation of the whole country There is no map tile or similar data unit the basic units of OS MasterMap data are features Therefore user systems must manage OS MasterMap data at the feature level using the TOID to reference and store information on features RR a a a OS MasterMap user guide product specification chapter 1 2 v5 1 2 2004 Crown copyright Page 20 Themed data Features are grouped into themes see Chapter 1 3 OS MasterMap themes such as buildings roads and land to enable more flexible data selection by customers Themes should not be thought of as independent data layers because one feature can be a member of more than one theme Themes allow a customer who is only interested in say building footprints and addresses to select just this data The theme s that a feature belongs to are determined by theme rules based on feature type and descriptive attributes Additionally the TopographicLine features that bound a TopographicArea feature belong to the theme of that area feature For instance all the line features that bound a lake are included in the water theme The terrain and height theme currently contains limited information Please see the theme rules in chapter 1 3 for the contents before ordering Address Layer OS MasterMap includes an Address Layer that provide
34. is represented by a feature in OS MasterMap data A complete list of the real world objects and their feature representations in the Topography Layer is given in the OS MasterMap Real World Object Catalogue OS MasterMap user guide product specification chapter 1 2 v5 1 2 2004 Crown copyright Page 17 An OS MasterMap feature within the Topography Layer may be e a TopographicPoint feature representing a small object such as a letter box e a TopographicLine feature representing the centre line of a linear object such as a fence or hedge e a TopographicLine feature representing the boundary of an area object such as the extent of a building e a TopographicLine feature representing the inferred division between two objects such as an internal house division e a TopographicLine feature representing the shape of the terrain such as the top or bottom of a slope e a BoundaryLine feature representing an administrative boundary such as a county e a TopographicArea feature representing an object bounded by a continuous sequence of line features such as a building road section field or pond e aCartographicText feature giving additional information such as the distinctive name of a topographic feature or e a cartographic symbol feature giving additional information such as the direction of water flow An OS MasterMap feature within the Address Layer is e a point feature representing the location of a postal address An OS Mas
35. necessary for postal purposes where there are thoroughfares of the same name to aid differentiation For example SHIRLEY and SWAYTHLING in the situation HIGH STREET SHIRLEY SOUTHAMPTON and HIGH STREET SWAYTHLING SOUTHAMPTON Post town The post town is the town or city in which is located the Royal Mail sorting office from which mail is delivered to its final recipient There may be more than one possibly several sorting offices in a town or city OS MasterMap user guide product specification chapter 1 5 v5 1 2 2004 Crown copyright Page 58 Postcodes A post code is an abbreviated form of address made up of combinations of between five and seven alphanumeric characters These are used by Royal Mail to help with the automated sorting of mail A postcode may cover between 1 and 100 addresses The average number of addresses per postcode is 15 There are two main components of a postcode e the outward code also called outcode The first two four characters of the postcode constituting the postcode area and the postcode district It is the part of the postcode that enables mail to be sent from the accepting office to the correct area for delivery and e the inward code also called incode The last three characters of the postcode constituting the postcode sector and the postcode unit It is used to sort mail at the local delivery office For example OUTWARD INWARD NW 6 4 DP Unit Sect
36. non real world object part of an object or several objects Lineage Great Britain was completely remapped between the years 1946 and 1983 and this mapping continues to be updated and upgraded Since 1946 surveying and mapping techniques have developed and the specifications for capture and maintenance of the mapping have changed to meet new user requirements Consequently maps have been produced by a number of different methods producing a range of accuracies and content within the overall tolerances appropriate to the scale of the published map The graphic mapping was digitised from published Ordnance Survey topographic maps created from ground or photogrammetric surveys Large scale topographic maps were traditionally published at scales of 1 1250 urban areas 1 2500 rural areas and 1 10 000 mountain and moorland areas The survey practices and quality control procedures adopted during their production were designed to ensure that the resulting maps are true cartographic representations of the landscape commensurate with the scale of publication These maps were not intended to represent surveys of engineering quality or precision but are a multipurpose series of general topographic maps The digitising programme began in May 1971 and was aimed at the automation of graphic map production The increasing demand for digital data in the 1980s led to an acceleration in the digitising programme and coverage of Great Britain was completed in
37. on e All vegetation e Tracks and paths including driveways gt 100 m long in private gardens e Telephone call boxes and letter boxes e Extensions to commercial industrial community and public sector buildings less than 0 25 hectares in extent e Apparent property boundary features not in category A that is those erected since the initial development and not part of refurbishment programmes Mean high and low water when affected by change to other features in category A and B Category C Category C is not currently revised but is retained within the specification either to meet current customer needs to allow for changing customer priorities in the future or to allow sensible completion of category A and B revision e Extensions to existing private residential buildings e Private garages e Street furniture such as guide posts mile stones and water taps e Archaeological information RRR a OS MasterMap user guide product specification appendix B v5 1 2 2004 Crown copyright Page 189 Categories of land Urban All contiguous built up areas that are over 20 hectares in extent and that have a population greater than 1 000 Rural All parts of Great Britain excluding those areas defined as either urban or moorland Moorland All areas of undeveloped topography currently defined by the extent of original capture at 1 10 000 scale The area covered by each of the categories can be seen at www ordnancesurvey co uk p
38. only update fil8S oooinnnninnnnninnnnncccnnnccccnnorncn nn n nc cnn cnc raro 132 NCTEASINO your data AAA A aires 133 Renewing VOU CONTA te 134 A A e sass eaeyesoresnenscces 134 COIN Santana aora 135 Feature MOUSCKEE PING shes a A A c a 136 FIltering IESCTIPtIVS ATIDUTES iii eones 136 Chapter 1 11 OS MasterMaprand Positional ACCURACY ai ba 137 Chapter 1 12 OS MasterMap quality statements ninia aaa dada 138 PURDOS Boost id dia 138 SCOPE and GOTMMONS ida 138 COVE AGS ii dace dansngeidad E E E E A NS 138 Acceptable quality level AQU arras a a ea aia Ea teres E E 138 Copidencelevel Snar e a E E e a a e a oiina 138 RE al WOM ClO DIO CU ray ssi ia E ae eE ESOT Aa 139 FQ TUG viscid vnnsne ld aei a desing seein A E ia 139 Hnede nuas O E 139 Contentispeclficalon changes s enie an a e aa a a A i ia aa E En ad aar or AE 140 QUAIL statement Components stank re a a a aa aa aeai ee aae aa aeaa elena 140 COmpleleness asio oiingan ete erai attend ERE AE Eaa ATTE EA DEAE Ta SEN ee 141 DEMO A E A dulesendb vedrmaaed frends bale wed anemia neonates 141 Measurable Smoar a O A A Ea AA a E cotasheecuameanes 141 COMO r e a A A a R a hata a a a E E 141 COMES SUG N asor ri ane e ara ia dinette esis e a aa ie ANa a E sor ON a Ae EAT a E a rai 142 OPONE a aces 142 POSITION ACCUNACY a E E E E s 142 Geomettic Hades a R O A A E A a S S 142 REENER ACCURACY AE A E A E E A E AE 143 PDSOIUTC ACCAC Ynis eean i E baci Ea Eaa aaa ES A E E A ida 145 Temporal ACCUTANE a
39. or organisation Remember you are responsible for your password and its use by any member or your organisation or any third party to which you are contracted If you suspect that your password has been disclosed to an unauthorised person or organisation you must change your password by using the change password function on the data selector You may change your password at any time using the data selector This request will be validated with the account holder for your organisation by emailing the new password to them If you lose or forget your password you will need to request a new password via our Customer Service Centre either by email to digitalsalesenquiries ordnancesurvey co uk or by telephoning 023 8030 5520 Again this request will be validated with your organisation s account holder by emailing the new password directly to them The data selector will allow you ten attempts at inputting the correct password before you are blocked from entering it If this occurs you will need to contact the Customer Service Centre by either email or telephone as above to request a new password Once again any request will be validated with your company account holder It will take time to issue a new password please bear this in mind and safeguard your password For security reasons your password is only valid for 180 days After this time when you next log onto OS MasterMap you will be advised that your password has expired and asked to use the C
40. sections only give an indication of real world objects that may appear in the Topography Layer themes See Chapter 1 3 OS MasterMap themes for further explanation on themes RRR a OS MasterMap user guide product specification chapter 1 4 v5 1 2 2004 Crown copyright Page 35 Administrative boundaries Boundary alignments are shown within the administrative boundaries theme as well as the boundaries relationship to real world objects its mereing and boundary descriptions where needed for clarification The following types of boundary are shown within the administrative boundary theme Parliamentary boundaries e European electoral region e burgh constituency Scotland e county constituency e assembly electoral region and assembly constituency Wales and e borough constituency e parliamentary electoral region and parliamentary constituency Scotland England and Wales Local government boundaries e In England e county e City and County of London district London borough unitary authority and metropolitan district e civil parish and the Inner and Middle Temples e electoral division and e ward e In Wales unitary authority e community and e electoral division e In Scotland e unitary authority and e ward RR a a OS MasterMap user guide product specification chapter 1 4 v5 1 2 2004 Crown copyright Page 36 Boundary alignments Administrative boundaries may or may not have a predefined rela
41. the Integrated Transport of OS MasterMap and the base requirements Network ITN Roads Layer specification for use of the data product e Chapter 1 8 explains how change to a feature is applied e Chapter 1 2 gives an overview of the key features of OS MasterMap which are fully detailed in the Reference e Chapter 1 9 gives an overview of the online supply section OS MasterMap user guide service e Chapter 1 3 describes the themes available e Chapter 1 10 provides advice and information on how to best manage OS MasterMap data in your system e Chapter 1 4 describes the Topography Layer e Chapter 1 11 deals with OS MasterMap and positional e Chapter 1 5 describes the Address Layer accuracy e Chapter 1 6 describes the Imagery Layer e Chapter 1 12 is a statement about the quality of OS MasterMap Appendix A is a glossary with links to and from the relevant parts of the user guide Appendix B describes our priorities when capturing change Appendix C is a product and service performance report form for you to submit any comments on OS MasterMap RRR a a a a OS MasterMap user guide product specification chapter 1 1 v5 1 2 2004 Crown copyright Page 12 General description of OS MasterMap OS MasterMap is a consistent and maintained framework for the referencing of geographical information in Great Britain It comprises detailed topographic cartographic administrative boundary postal address topological road netw
42. the TOID provides a unique reference to a particular version of a changing feature There is inevitably some degree of subjectivity involved in judging that a real world object Address or ITN Roads feature has changed so much it can no longer be considered the same object and therefore the OS MasterMap feature s representing it should be deleted and replaced In the case of ITN Roads features topological structuring required to make the data useful can significantly impinge on the ability to logically preserve features This document details the rules we apply to reduce this subjectivity as much as possible The purpose of TOIDs OS MasterMap TOIDs have several purposes e TOIDs are designed to allow the association of data pertaining to real world objects thus reducing the need for multiple parties to capture and maintain feature geometry and facilitating sharing of information between OS MasterMap users e TOIDs are also used to refer to one OS MasterMap feature from another For instance the boundary of an OS MasterMap area feature in topological polygon data is specified by a chain of line feature TOID references e TOIDs are used to inform the user of modified and departed features in change only data update e Sets of TOIDs can be used as complex features representing schools factories road junctions or individual properties comprising a house its garage and garden The potential power of the TOID is dependent upon the cons
43. well defined point of detail in OS MasterMap are compared to their true position the expectation would be that in 95 of cases they would lie within a circle of radius 1 0 m from the true value Correction Any reported errors are addressed during the normal update cycle or earlier if warranted by their impact on customers business Improvement Ordnance Survey is improving the positional accuracy of rural overhaul 1 2500 scale pre positional accuracy improvement OS MasterMap through our Positional accuracy improvement programme http www ordnancesurvey co uk positional Temporal accuracy The two components of temporal accuracy are consistency and validity Temporal consistency Definition Shows how well ordered events are recorded in OS MasterMap Measurables e TOID version numbers for change only update will only increase with time for updated features e TOID version dates for change only update will only increase with time for updated features e Version dates and history dates relate to date of update RRR a OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 146 Conformity TOID version numbers increase by one or more for each feature update TOID version dates increase for each feature update but do not exceed delivery date History dates are equal to or less than the last version date AQL 100 Correction All errors are identified by validation softw
44. where variations are not significant The files are encoded in XML according to an XML schema definition that is available at http www ordnancesurvey co uk xml schema v3 0SImageMetadata xsd The geometry components make use of GML 2 1 2 geometry definitions as defined in Chapter 2 3 and Chapter 2 4 An example is outlined below lt xml version 1 0 encoding UTF 8 gt lt osgb OrthoImageMetadata xmlns osgb http www ordnancesurvey co uk xml namespaces osgb xmlns gml http www opengis net gml xmlns xsi http ww w3 org 2001 XMLSchema instance xsi schemaLocation http www ordnancesurvey co uk xml namespaces osgb OSOrthoMetadata xsd gt lt osgb copyright gt Ordnance Survey c Crown Copyright 2002 lt osgb copyright gt lt osgb kmReference gt SU4818 lt osgb kmReference gt lt osgb dateFlown gt 2001 08 21 lt osgb dateFlown gt lt osgb kmRectangle gt lt osgb Rectangle srsName osgb BNG gt lt gml coordinates gt 436000 108000 437000 109000 lt gml coordinates gt lt osgb Rectangle gt lt osgb kmRectangle gt lt osgb lensFocalLength uom http www ordnancesurvey co uk xml resource units xml millimetres gt 150 352 lt osgb lensFocalLength gt lt osgb nominalFlyingHeight uom http www ordnancesurvey co uk xml resource units xml metres gt 1800 lt osgb nominalFlyingHeight gt lt osgb nominalImageScale gt 1 10000 lt osgb nominalImageScale gt lt osgb resolution uom http www ordnancesurvey co uk xml reso
45. 04 Crown copyright Page 29 Example Property management Do you need to manage large areas of land Individual polygons may be customised to identify different types of land use terrain value and so on Area polygons also have a value known as the calculatedAreaValue which allows users to determine the area of the polygon in metres square Yessell Farm End Property Management All area measurements are in square metres OS MasterMap user guide product specification chapter 1 4 v5 1 2 2004 Crown copyright Page 30 Example Incident control Do you need to share information with other users TOIDs provide a unique reference for real world objects that allow customers to identify and pass on information to other parties info Tool x TOID 0001000019585464 El Hazardous_Material Liquid Petroleum Gas Contact Mr J Law Number 4234 567891 3213 Hazardous_Database x OS MasterMap user guide product specification chapter 1 4 v5 1 2 2004 Crown copyright Page 31 General principles Wherever possible real world objects are represented in their true surveyed position For the sake of clarity of display or plotting real world objects may be generalised for example small juts in house fronts The normal methods of generalisation that can be applied to features are e emphasis e selection for inclusion e simplification and e omissio
46. 1 8 v5 1 2 2004 Crown copyright Page 109 Because there is no recorded relationship between OS MasterMap line features and particular discrete real world objects any change to a line feature may result in deletion or significant modification of that feature and creation of new line features This change is not necessarily caused by real world change to the linear object represented by the feature In the example above the original line feature is retained as one of the resultant line features the other line feature is new The user cannot predict which of the resultant line features will bear the original TOID This means that associating user data with OS MasterMap line features by TOID references is rarely advisable The major exception to this is that when the reasonForChange is a correction of error rather than real world change then features are retained whenever possible Creation of line features When a new linear real world object comes into being a new line feature is created to represent it Deletion of line features When a real world object is no longer present in the real world the corresponding line feature is deleted from the database A record is kept in the database to indicate that a feature with this TOID used to exist Modification of line features due to real world change As noted above a line feature may be modified due to changes to the real world object or due to changes in adjacent real world objects The o
47. 1995 These digital maps have been constantly revised within a digital environment since their initial capture and are now known as the Land Line product In April 2000 Ordnance Survey commenced a programme to convert the unstructured tile based data into an object based seamless dataset to form the basis of OS MasterMap The resultant data was further improved in a manual editing programme finishing in October 2001 RRR a OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 139 Content specification changes There have been small changes to elements of the content specification now the OS MasterMap real world object catalogue since the initial digitising programme commenced in 1971 Such changes have not normally been implemented retrospectively This means that within the data there are features that do not fully comply with the current OS MasterMap real world object catalogue For example Ordnance Survey historically captured all buildings greater then 8 0 m in private gardens This minimum size was increased to 12 0 m in 1988 Buildings now considered undersized but captured before that date could remain in the data Quality statement components Ordnance Survey assesses the quality of OS MasterMap data by five quantifiable components e completeness e positional accuracy temporal accuracy e logical consistency and e attribute accuracy These quantifiable components ap
48. A a a OS MasterMap user guide product specification chapter 1 1 v5 1 2 2004 Crown copyright Page 13 System requirements OS MasterMap data is designed for use as an intelligent digital map within geographical information systems GIS and database systems We are unable to give guidance on hardware and software requirements since these depend entirely on how you intend to use the data System developers can offer advice and can develop a system to suit your application For details of Ordnance Survey s Licensed Partners who can incorporate OS MasterMap in their systems please see the systems software page on our web site To help in your system planning the following approximate compressed file sizes for the Topography Layer only are 1 Birmingham urban Area 266 976 km 880 Mb 2 Carmarthenshire mainly rural Area 2 453 540 km 410 Mb 3 Edinburgh urban Area 272 392 km 290 Mb 4 Horsham suburban Area 529 389 km 180 Mb 5 Rutland mainly rural Area 392 478 km 60 Mb For estimates of file sizes for the Imagery Layer see Chapter 1 10 Data management guidelines The minimum system requirements to use the OS MasterMap service are at heading Minimum system requirements for the online service in chapter 1 9 RR a a a OS MasterMap user guide product specification chapter 1 1 v5 1 2 2004 Crown copyright Page 14 Supply e OS MasterMap incorporates a web based ordering system that allows you t
49. Colour e Contrast e Sharpness and image smearing Obscuring shadow such that ground detail within the shadow is not visible Conformity Images are substantially free from artefacts Small amounts are acceptable in localised areas and only where significant features are not obscured RRR EE OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 165 Clipping of the extremes of the image greyscale histograms is minimised and avoided wherever possible Cloud cover and cloud shadow is less than 5 per sq km image and the detail obscured is not urban or of major significance in rural areas Colour and contrast will be as consistent and as near to a realistic representation of the true colour on the ground as possible The image will be sharp when viewed at actual pixel resolution 1 1 scale and will not show unnecessary grain or softness due to flying conditions or image processing Image smearing blurring or ghosting will be minimised Obscuring shadow that is where it is not possible to interpret and identify topographic features such as street furniture road markings access routes and extent of buildings will be minimised Correction No correction that requires either the return of imagery to the supplier for reprocessing or the capture of new imagery specifically to correct an error will take place unless Ordnance Survey believes that failure to do so would have serious cons
50. EL Descriptive names with or without numbering are captured if included in PAF Building numbers The building number or postal number is a number given to a single building or a small group of buildings thus identifying it from its neighbours for example 44 HIGH STREET Building numbers that contain a range decimals or non numeric characters do not appear in this field but will be found in the buildingName or the subBuildingName fields RRR a a a OS MasterMap user guide product specification chapter 1 5 v5 1 2 2004 Crown copyright Page 57 Dependent thoroughfare In certain places for example town centres there are named thoroughfares within other named thoroughfares for example parades of shops on a high street where different parades have their own identity For example KINGS PARADE HIGH STREET and QUEENS PARADE HIGH STREET Thoroughfare A thoroughfare in the Address Layer is fundamentally a road track or named access route on which there are Royal Mail delivery points for example HIGH STREET Double dependent locality This is used to distinguish between similar or same thoroughfares within a dependant locality For example Millbrook Industrial Estate and Cranford Estate in this situation BRUNEL WAY MILLBROOK INDUSTRIAL ESTATE MILLBROOK SOUTHAMPTON and BRUNEL WAY CRANFORD ESTATE MILLBROOK SOUTHAMPTON Dependent locality Dependent locality areas may define an area within a post town These are only
51. Imagery Layer Every effort is made to ensure that the Imagery Layer matches the Topography Layer however there will be occasions where this does not occur for example in rural areas where PAI has not taken place or where the Topography Layer is awaiting update OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 175 Appendix A Glossary The purpose of this chapter is to provide a glossary of terms used in the definition of products services licensing and other terms and conditions for OS MasterMap and OS MasterMap based products Where terms refer to other terms within the glossary they are connected by means of hot links to the relevant entries account Every OS MasterMap customer has an account This is more than just a financial account but is an overarching term for the agreements orders access rights and financial arrangements that a customer has with Ordnance Survey addressed premise A permanent or non permanent location with an address being a potential delivery point for Royal Mail Examples of an addressed premise are a house a flat within a block of flats a caravan site a bollard to which several houseboats may be moored or an organisation occupying the whole or part of a building ancestry The ability of a feature to reference deleted features that have some relationship to it Ancestry is not currently a feature of OS MasterMap application service provider ASP A c
52. Map features also have life cycles For example a new building Address or ITN Roads feature will be created in the data it may be modified one or more times and eventually it may be deleted OS MasterMap TOIDs do not have life cycles A TOID is the unique number that identifies a feature It is assigned when the feature is created and is never reassigned to a different feature A TOID does not itself have any geometric or other attributes those belong to the feature it identifies The life cycle of an OS MasterMap feature is closely linked to the real world object life cycle However not all changes to the real world object will be reflected in changes to the feature For example the addition of a new porch to a house might be considered too insignificant for Ordnance Survey data capture Different users with different applications think of feature life cycles in different ways For some any change to the geometry or classification of a feature means that the feature is no longer the same feature for their application For others the requirement is for persistence of features so a feature continues to exist through extensive modification a AA OS MasterMap user guide product specification chapter 1 8 v5 1 2 2004 Crown copyright Page 101 After consultation with users we have adopted the approach of allowing features to persist through changes so far as is reasonable We also provide a feature version number which when used with
53. Ordnance Survey CRAWESICIAEION User guide Product specification Preface Contact details This user guide is divided into two parts Part 1 product specification contains the information you need to make effective use of the OS MasterMap product and service and is designed to help you understand the information contained in the data Part 2 reference section contains detailed technical information and data format specification This user guide has been checked and validated before issue and every endeavour made to ensure that the contents are accurate If you find an error omission or otherwise wish to make a suggestion as to how this user guide can be improved please contact us at customerservices ordnancesurvey co uk or the address shown under contact details or use the Product and service performance report form at appendix C The Customer Contact Centre will be pleased to deal with your enquiries Phone 023 8030 5520 Fax 023 8030 5477 Email digitalsalesenquiries ordnancesurvey co uk Welsh Language HelpLine in Welsh phone 08456 05 05 04 or write to Customer Contact Centre Ordnance Survey Romsey Road SOUTHAMPTON United Kingdom 016 4GU Visit the Ordnance Survey web site at www ordnancesurvey co uk OS MasterMap user guide product specification preface v5 1 2 2004 Crown copyright Page 1 Product performance If you have any problems with or identify any errors in the data or user gu
54. Qualifier is optional and if not present then the routing information applies to all vehicle types RR a OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 81 environmentQualifiers The environment qualifier can provide either an instruction or classification The diagram below shows the structure lt should be noted that the lists of instructions and classifications are only illustrative the actual values are specified in the Reference section OS MasterMap user guide see Attribute values instruction and Attribute values classification environmentQualifier 0 0 n instruction classification Mandatory Tum gt No Turn Bridge Over Road No Entry Bridge Under Road One Way Level Crossing Access Limited To For d Access Prohibited To Barrier Gate Toll Indicator Mini Roundabout Traffic Calming Firing Range Through Route Rising Bollards Gradient Severe Turn OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 82 dateTimeQualifier A date time qualifier specifies the date and or time period that the routing information applies to This may be through known named dates times or specified dates times It should be noted that the lists of possible attributes are illustrative the actual values are specified in the Reference section OS MasterMap user guide see Attri
55. VALETO IERE e0 OAE E A A A E T E T A T 74 Imagery Laya A os 175 GIGS SONY cies cna lawsainetsencaloataeysainndennen E E EET E EENE E A E AE E 176 Categories of CANO ii 188 Cate gO Ati 188 Cae OO Br aaee A A A E a a A E a A E E 189 Gategory C ncm A EA T a EER E A A TON EE 189 Categories of land as 190 Uraren aa ts cate eat cate cn AEREA A OO 190 O RA 190 OS MasterMap user guide product specification contents v5 1 2 2004 Crown copyright Page 10 Moorland Units of change Appendix C Product and service PEMONMANGE report TOM dara e 193 O ees ees ee see ee OS MasterMap user guide product specification contents v5 1 2 2004 Crown copyright Page 11 Chapter 1 1 Introduction Using the user guide This documentation is supplied in Portable Document Format PDF only Free Adobe Acrobat Reader software which displays the user guide allows you to navigate and also incorporates search and zoom facilities Navigation can also be carried out by clicking on the blue hyperlinks and the table of contents Hyperlinks are used to navigate between associated parts of the user guide and to relevant internet resources This user guide is divided into two parts Part 1 as detailed below contains basic information you will need to understand use and manage OS MasterMap Part 2 contains detailed technical information and data format specification e Chapter 1 1 provides a brief description of the concept e Chapter 1 7 describes
56. a named road is not continuous for example at a junction to identify other links that may be part of the same road In this way a Road feature is created referencing the links in an area that represent a single named road On rare occasions RoadLink features representing the same named road separated by a distance in excess of the set tolerance may result in two Road features being created with the same name Similarly it may be that two roads with the same name separated by less than the threshold may be created as a single feature Representation of roads by RoadLink features and Road features Example of the relationship between RoadLink Road feature features and Road features Crabwood Close is roadName Crabwood Close represented by a Road feature that references networkMember 1 2 3 RoadLink features number 1 2 and 3 OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 70 Reference to RoadLink features by Road features representing named roads at roundabouts and junctions At a roundabout or road junction any RoadLink may only be referenced by one named Road feature The following priorities are used to determine how links are referenced at road junctions including roundabouts 1 To reflect the real world situation as far as possible 2 Where no single named road extends either side of a roundabout then the roundabout RoadLinks will not be referenced by any of t
57. a result of differences in process or technique in the original image capture and processing rather than substantial changes or natural variations on the ground Imagery is supplied to the customer in tiles that are 1 km by 1 km in 24 bit colour Each image file is accompanied by an XML metadata file see Image Metadata It is sourced from air photography with a ground resolution of 25 cm All of the imagery supplied is orthorectified using National Grid control or GPS data with a suitable transformation The terrain model used is at or above the specification for the Ordnance Survey Land Form PROFILE product Imagery flown before 1999 will not be used in the first release of the OS MasterMap Imagery Layer The objective is that the OS MasterMap Imagery Layer should be consistent in its quality across all of Great Britain to meet a set of standards in relation to e the image capture to follow RICS 89 RICS 2001 or equivalent e film and camera e nominal photo scale e orthorectification procedures including quality of the terrain model to be used e geometric accuracy e image appearance including thresholds for cloud cover and artefacts within the image and mosaicking including quality of joins and colour balance RRR a OS MasterMap user guide product specification chapter 1 6 v5 1 2 2004 Crown copyright Page 62 Moving forward Ordnance Survey recognises that advances in imagery technology and techniques should furth
58. ably consistent source of orthorectified aerial photography for general business use in Great Britain Ordnance Survey plans to ultimately cover the whole of Great Britain with a target rolling renewal programme three year for urban and rural five year for mountain and moorland The Imagery Layer will provide users of all but the most detailed applications with a consistent seamless source of imagery data that integrates with other layers in the OS MasterMap family Our objective of a seamless layer is that the joins between the separate images that make up the Imagery Layer will be minimal that it is colour balanced and edgematched such that analysis of information across image boundaries is not seriously hampered by misalignment or inconsistency Variations because of time of day differences for example lengthening shadows colour changes time of year differences for example vegetation changes river levels and age differences for example new developments road changes mean that some variation is inevitable and an overzealous attempt at imposing an artificial evenness would be misleading The successful integration of imagery that has been captured and processed by several suppliers has required some of the industry s best skills and a considerable investment in time and resources The result is a product that has greatly increased utility and value through the levelling of many of those variations in colour contrast and alignment which are
59. act on the refererenceToTopographicArea attribute of RoadLink and RoadNode features when they have no topographic features to reference RRR a a OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 173 Attribute accuracy Unclassified features There are a small number of unclassified area features and a larger number of unclassified text and point features These all appear in the land theme A significant proportion of text and some point features will be correctly themed by a future release of OS MasterMap At 30 November 2001 0 05 of area features were unclassified Heritage theme The heritage theme currently contains very little information Most of the features that would be considered to be heritage features fall in the land theme Tracks and paths Tracks and unmade paths are not explicitly identified by descriptive group and currently appear in the land theme not the roads tracks and paths theme This is likely to be addressed by a future release of OS MasterMap Dual themes Some area features may intuitively belong to more than one theme for example a railway station Currently the vast majority of area features will only belong to one theme Some area features may become dual themed in a future release of OS MasterMap Referencing from OS MasterMap ITN Roads Layer to OS MasterMap Topography Layer The referenceToTopographicArea attribute from RoadLink and RoadNode feat
60. adLink or at a point along a RoadLink are captured as RoadLinkInformation features Typical examples that apply to an entire link could be access restrictions such as no access for unauthorised vehicles residents only or information such as the presence of traffic calming measures Examples that apply to a specific location on a link regardless of direction of travel are level crossings gates fords and height restrictions not associated with a road bridge Where location along a link is relevant and available this is supplied as both National Grid coordinates and the distance along the link from its start point Information about a RoadLink or number of RoadLinks specific to a given direction of travel RRI features that apply in a specific direction of travel to single or multiple RoadLink features are captured as RoadRoutelnformation features Examples would be turn restrictions which apply to multiple links such as no U turn one way streets which affect a single link in a specified direction and access restrictions that apply in one direction only Where location along a RoadLink is relevant and available this is supplied as both National Grid coordinates and the distance along the RoadLink feature from its start point Information about part of a RoadLink where direction of travel is unimportant RRI features that apply regardless of direction of travel to a portion of a single RoadLink are captured as PartialRoadLin
61. al objects in the OS MasterMap real world object catalogue are captured as part of revision and that features representing no longer extant real world objects are deleted We do not routinely remove features that were in previous versions of the content specification if they represent objects in the real world that still exist Ordnance Survey does not capture metrics on completeness because of the difficulty in establishing numerical baselines for the real world and the data Capture of change is described under Temporal consistency RRR a OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 141 Correction Any reported errors of comission or omission are addressed during the normal update cycle or earlier if warranted by their impact on customers business Improvement Ordnance Survey will continue to monitor the data collection processes and to review the OS MasterMap real world object catalogue periodically to meet customers requirements Positional accuracy Positional accuracy has three main components geometric fidelity relative accuracy and absolute accuracy Geometric fidelity Definition Geometric fidelity is the trueness of features to the shapes and alignments of the real world objects they represent Normally geometric fidelity takes priority over relative and absolute accuracy Measurables The degree to which e detail that is square on the ground is represented
62. al polygon product The difference only lies in the representation of polygons there is no difference in point and line geometry types inferred links Line features representing inferences about the real world rather than topographic statements of fact These sensibly subdivide certain types of area feature where there is no appropriate topographic detail They are normally used to e divide road sections e separate individual garden plots in residential areas where no dividing fence hedge or wall exists e close junctions between roads and car parks or hardstanding areas and oO ose fields that have simple breaks in the hedge or wall rather than gates These are automatically created using software layer A layer is a group of related OS MasterMap themes A layer may consist of one or more themes For instance the Topography Layer is composed of nine themes whereas the Address Layer contains only one theme Licensed Partner Any organisation that has entered into a formal licence agreement with Ordnance Survey to market map information or to incorporate map data with their application or service life cycles The series of events that occur in the life of a real world object or the OS MasterMap feature s that represents it This will always include those events that result in creation and deletion and may also include events that result in amendments or change OS MasterMap user guide product specification appendix A v5 1
63. alifier Taxi School Bus Patron 0 n use Access gt exceptFor boolean false Resident Emergency Vehicle Nos load exceptFor boolean false 0 0 type exceptFor boolean false maxHeight maxCompositeHeight OS MasterMap user guide product specification chapter 1 7 Emergency Access Public Transport Authorised Vehicle Local Bus Escorted Traffic Explosives D Dangerous Goods Abnormal Loads Wide Loads Buses Coaches Mopeds Motor Cycles 1 HGVs LGVs Towed Caravans Motor Vehicles Cycles Tracked Vehicles v5 1 2 2004 Crown copyright Page 84 Examples of RRI features One way Example Dual carriageway with turning roads A and B and joining road C In this example Pine Street consists of two carriageways where traffic is only permitted in one direction on each carriageway In this example there will be a RoadRoutelnformation feature for each of the RoadLink features that are one way The references to the RoadLink features specify the direction that the restriction applies in RoadRoutelnformation attributes dateTimeQualifier n a environmentQualifier Instruction One Way vehicleQualifier n a OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 85 T
64. aller field feature is deleted 2 Three fields which are broadly similar in size are merged into one such that none of the original fields are recognisable as the obvious predecessor of the resultant field The original features are deleted and a new feature is created to represent the field 3 A small pond within a field is filled in The feature representing the pond is deleted and the field feature is retained 4 Two semi detached cottages of equal size are combined into one dwelling with no alteration to the external geometry of the building Both of the original features are deleted and a new feature is created a AE OS MasterMap user guide product specification chapter 1 8 v5 1 2 2004 Crown copyright Page 107 5 A large greenhouse lies within a parcel of land only marginally larger than itself The greenhouse is demolished The feature representing the greenhouse is deleted and the feature representing the land parcel is deleted as it has increased significantly and can no longer be seen as the same object Change of area feature classification When a real world object represented by an area feature changes such that the descriptive group or descriptive term of the feature changes then the feature is usually retained unless changes to its geometry indicate deletion of the feature under the guidelines above For full information on these feature attributes see the Reference section OS MasterMap user guide Alterations d
65. an added value service PAYU Pay As You Use OS MasterMap user guide product specification appendix A v5 1 2 2004 Crown copyright Page 183 period licence A licence to use a data product or any other value added service or product derived from detailed datasets for business use for an agreed period of one or more years It covers the initial supply of the data and supply of update period licence service A service provided to customers by Ordnance Survey or Licensed Partners giving access to Ordnance Survey data for business use including update maintenance The service will be for a defined period These services will be available under a period licence agreement physical level A feature attribute giving an ordinal classification applied to vertical relationships between various features or within feature collections In the OS MasterMap context this is the level at which the feature lies that is underground obscured ground level or a level above ground physical presence A feature attribute indicating whether a feature represents an obstructing or non obstructing real world object Also includes several other possible values point See Reference section OS MasterMap user guide point feature A feature representing a real world object The geometry of a point feature is a single point a pair of coordinates with optional size and orientation polygon The polygon geometry type is used to specify the outer an
66. an tides or mean spring tides in Scotland flow at low water The point is shown and annotated by text e the text descriptions of all water features and e flow arrows a symbol used to indicate the direction of flow of non tidal moving water Constraints imposed by survey principles Rivers streams and drains are shown at their true scale width or by a single line where their width is less than 1 0m urban areas 2 0m rural and mountain and moorland areas OS MasterMap user guide product specification chapter 1 4 v5 1 2 2004 Crown copyright Page 51 Chapter 1 5 Address Layer Overview The Address Layer in OS MasterMap provides the location of approximately 26 million residential and commercial postal addresses in Great Britain The Address Layer originates from Royal Mail s PAF Ordnance Survey matches PAF addresses to their real world location and represents this by coordinate values When the address can be matched to a building feature then a reference between the building and the address is created Figure 1 5 1 Example of the Address Layer used with the Topography Layer OS MasterMap user guide product specification chapter 1 5 v5 1 2 2004 Crown copyright Page 52 Addresses are subject to change from many causes including property redevelopment new construction and house street name changes The Address Layer provides a mechanism that assists users to track and manage these changes with respect to the a
67. ance Survey will continue to monitor processes and to review the update of OS MasterMap addresses periodically to meet customers requirements RRR a a OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 154 ITN Roads Layer Completeness Definition Completeness measures how many ITN Roads RoadLink and RoadNode features captured under current specifications are present compared with the real world Measurables e Visual checks against OS MasterMap Topography Layer e Field auditing Conformity At least 99 5 of polygons representing a road in OS MasterMap will have ITN RoadLink features and RoadNode features At least 95 of road names numbers and extents in the ITN Roads will match the corresponding road name number or extent as captured within the OS MasterMap Topography Layer At least 95 of Road Routing Information captured under current specifications will be present and correctly related to the relevant RoadLink and or RoadNode features Whilst Ordnance Survey makes every effort to ensure that all roads features and attributes are captured it cannot guarantee that the current ITN Roads contains all roads in Great Britain Correction We aim to correct any errors of comission or omission reported to the ITN maintenance team ideally within one month but within a maximum of three months Improvement Ordnance Survey will continue to monitor the data collection pr
68. appears more than once within a chunk square each selection polygon is supplied in separate files The following diagram shows what happens in the instance of a selection polygon that falls within a chunk square twice polygon Two files are supplied each one distinguished by a counter number 1 and 2 The counter numbers are included in the file name see File names in chapter 1 10 OS MasterMap user guide product specification chapter 1 10 v5 1 2 2004 Crown copyright Page 135 Feature housekeeping Software designed to maintain an OS MasterMap data holding should be capable of feature level housekeeping functions An example of such a function is the removal of features that are entirely outside the user s nominal data holding area and are not referenced by features within the area Line features can occur in this state if they were once part of a polygon that overlapped the data area but are no longer part of that polygon These line features will be left in your data holding unless your system is capable of dealing with them and may conflict with other features Filtering descriptive attributes The description of an OS MasterMap topographic feature is contained in its feature type descriptive group s descriptive term s when present physical presence when present and make Feature supplied in its entirety Selection boundary The feature reduces in size and a new bounding line feature is adde
69. are most are corrected immediately Residual errors are addressed when notified by customers if warranted by their impact on customers business Improvement Ordnance Survey will introduce new technology and procedures that ensures each update of a feature is represented by a unit increase of its feature s version number Temporal validity currency Definition Temporal validity is defined as the amount of real world change that has been incorporated into OS MasterMap data that is scheduled for capture under current specifications Real world change is measured in units of change see appendix B Measurables e The amount of real world change that has been incorporated into OS MasterMap within the published timescales RRR a a OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 147 Conformity Capture of real world change Known category A change see appendix B will be captured and made available as OS MasterMap data within six months of the change occurring subject to the following e Isolated houses traffic calming measures and mobile park homes will only need to meet this requirement once an area has been subject to a national sweep unless they form an integral part of a new development e For the rural and moorland areas yet to undergo any form of cyclic revision only category A change exceeding one hectare in extent or one km for linear features will be captured
70. as a prohibited turn or advisory information such as the presence of a ford Within ITN routing information is maintained as separate features from the base network these reference the underlying road network features RoadLink or RoadNode features to provide their location Simplification and priority of routing information features Road routing information features attempt to record the effect and the nature of the real world restriction or environmental factors However this is not always possible as restrictions in particular may be manifest in many different ways yet have the same effect For example a single restriction may consist of a one way street that has a no entry sign no right left turn signs and or mandatory turn signs on the approach roads This would be represented in the simplest way by recording a one way street To ensure a level of consistency a hierarchy is used when more than one restriction that has the same effect at a given location occurs Only the restriction that has the highest priority will be captured Therefore RRI features primarily model the effect of any restriction in the simplest possible way and secondary to this is recording the real world manifestation OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 77 Restriction priority table Priority Restriction type 1 One way 2 No Entry Access Prohibited To Access Limited To 3 Mandatory Turns 4 No Tur
71. as square in the data and shapes must be accurate e alignments that are straight in the real world are represented as straight lines within the data e lines of sight that pass through ground points should when plotted at the scale of the original survey pass through the plan positions of the corresponding points and e adjacent features are in sympathy with each other as regards alignment and orientation RRR a OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 142 Conformity Acceptable geometric fidelity is defined as when data is plotted or displayed at the source scale of the mapping from which the data was originally digitised see Lineage It reflects the real world object s geometry Ordnance Survey does not collect statistics on this item but continually monitors the data collection methods to ensure compliance to an acceptable level of geometric fidelity Correction Any reported errors are addressed during the normal update cycle or earlier if warranted by their impact on customers business Improvement Errors in geometric fidelity will continue to be corrected to ensure that all data has acceptable geometric fidelity Relative accuracy Definition Relative accuracy is the positional consistency of a data point in relation to other local data points Measurable The comparison of the scaled distance between features measured from the data with the distances meas
72. ase 1 Road features ITN Roads Road features representing named or numbered roads are generated automatically and may on rare occasions combine two or more roads or split a single road RRR a a OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 171 Temporal accuracy consistency Supply of unchanged features It is possible that a very small number of features may be supplied as change only updates that have not changed since the last customer supply because the database that OS MasterMap is populated from does not currently include time stamping This is to ensure that all possible changed features are included in customer supply Features across supply chunks When change only update is supplied in chunks features may disappear entirely yet remain or newly appear in another To facilitate effective update customers should delete all features from each chunk then apply updated and new features to prevent accidentally deleting features that persist Versions and reasons for change There is not necessarily a one to one relationship between the version and reasonForChange attribute It is possible that a new version of a feature could be generated without the reasonForChange attribute being updated A typical example would be when the bounding features of an area change the area itself may not record the reasonForChange Versions Version numbers record the changes that have been mad
73. at the railway bridge OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 157 Example 2 Alley The RoadLink features represented here as thick white lines are broken at the road junction but not across the pavement OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 158 Example 3 Tunnel The RoadLink features represented here as thick red lines are not broken at the tunnel entrance OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 159 Example 4 Level crossing The RoadLink feature represented here as a thick red lines is not broken across the level crossing Correction We aim to correct any reported errors of comission or omission reported to the ITN maintenance ideally within one month but within a maximum of three months Improvement Resources are directed towards continually maintaining all ITN RoadLink and RoadNode features within the defined or inferred limits of the relevant features in the Topography Layer eS Se OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 160 Temporal accuracy Temporal validity Currency Definition Temporal validity is defined as the amount of real world change and or RRI scheduled for capture under current specifications that has been incorporate
74. ata direct on media or an email confirming that the data is ready to be collected from the FTP server Manual change only update is best taken with respect to the extraction date of the data last ordered under your contract The use of extraction date rather than the date you last placed an order or the date you actually downloaded the data is important These dates can be different and it is important that you use the extraction date as this will ensure you do not miss any changes or receive any duplicate features The service does not record when you have taken updates or the extraction dates of that data so you will need to keep a record of this For FTP orders the extraction date is stored on the lt order num gt details txt file on the FTP server For orders on media the extraction date is printed on the label and is contained in the Disc Contents txt file Change only update should not be taken for an area where you have not already taken full supply If you have not taken full supply of data there will not be anything with which to compare the change only update You can take changes only or a complete re supply of the latest data for your original area of interest It may be necessary to take a re supply to consolidate your holdings in the advent of corruption or data loss Like full supply change only update is available for supply via the FTP server and on media CD and DVD You can order updates at any time and as often as you wish for th
75. ater springs except where passing beneath a permanent structure such as a jetty canals lakes and lochs ponds bridges and footbridges moats reservoirs rivers streams drains and ditches foreshore features floating objects only shown when they are fixed and attached to permanent detail shake holes and swallow holes in mountain and moorland areas limits of numerous shake holes are shown and the area described as area of shake holes sluices except those found in sewage works stepping stones taps which take the form of drinking fountains or that form the communal water supply T tidal gauges waterfalls only if formed by natural features water troughs public t weirs bollards capstans and mooring posts breakwaters and groynes culverts perches pilot beacons and navigational beacons pumps wells spouts springs and fountains drinking fountainst swimming pools watercress beds issues sinks and springs These features are no longer captured under current specification and will only be maintained through deletion OS MasterMap user guide product specification chapter 1 4 v5 1 2 2004 Crown copyright Page 50 Non physical features shown in the water theme are e NTL the point inland to which mean tides or mean spring tides in Scotland flow at high water The point is shown and annotated by text e low water level LWL the point to which me
76. because this information is stored on the Road feature a AE OS MasterMap user guide product specification chapter 1 8 v5 1 2 2004 Crown copyright Page 114 Changes in topology 1 Where a RoadLink feature is split through structuring of another RoadLink feature or addition of a RoadNode feature the resultant feature with the greatest length will retain the original TOID and have its version increased The smaller section s will be created as new RoadLink feature s 2 Where a RoadLink feature is merged by removal of either a joining RoadLink feature or a RoadNode feature then the longest original RoadLink feature will persist with an increased version RoadNode A RoadNode feature that is moved and represents broadly the same intersection of RoadLink features should persist and the version increase Changes in topology 1 A RoadNode feature that has additional RoadLink features joined to it will persist with an increased version 2 ARoadNode feature that has RoadLink features removed from it will persist provided it is still required to represent either the intersection of two or more RoadLink features a change end of road name or the end of a RoadLink feature The version will increase InformationPoint InformationPoint features are relatively robust and will only very occasionally cease to exist 1 A changed motorway junction number will result in a new feature being created 2 Ifthe intersecting roads change then the Infor
77. bouts e kerb barriers a P o H e traffic islands in roads except when very small gates across roads x 2 traffic islands must be 8 m or more e posts preventing vehicular access e traffic calming measures forming a physical e weighbridges and obstruction including pinch points e cattle grids e dedicated cycle lanes road bounding features such as e fords and e hedges walls fences and banks and e car parks e crash barriers where they form the sole bounding e edges or centre alignments of tracks and paths feature of a carriageway e the treads of steps Non physical features shown are e textual descriptions whether they be descriptive or distinctive These features are recent additions to the specification and are being retrospectively captured as part of the revision process There is not expected to be national coverage of such features within the Topography Layer for five years dependant upon the progress of the revision programme These features are no longer captured under current specification and will only be maintained through deletion RRR a a OS MasterMap user guide product specification chapter 1 4 v5 1 2 2004 Crown copyright Page 45 Constraints imposed by survey tolerances The following two situations are treated in the following ways e Where the central alignment of an unmade path is less than 1 m urban areas or 2 m rural and moorland from an adjacent building
78. bute values dateTimeQualifier dateTimeQualifier 1 Period Z NamedPeriod SpecifiedPeriod school hours 7 0 n TimeRange 1 0 n Day NamedTime SpecifiedTime pstartTime time M endTime time dusk till dawn dawn till dusk Monday Tuesday Wednesday Thursday Friday Saturday Sunday Weekend Weekdays Bank Holidays Market Days 0 n DateRange SpecifiedDate MNomedDate startDate date MendDate optional date Month Season Easter Christmas OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 83 vehicleQualifiers The vehicle qualifier indicates whether the instruction applies or does not apply to specific types of vehicle The vehicle qualifiers currently describe a vehicle using use load or type and height information Where a vehicle type is an exception to the routing information it is identified by setting the exceptFor attribute to true The diagram below shows the structure It should be noted that the lists of textual values are illustrative only and are specified in the Reference section OS MasterMap user guide see Attribute values vehicleQualifier vehicleQu
79. cal relationship to another feature that defines its spatial context or a geometric representation such as a point line or polygon OS MasterMap ITN road features are a representation of named or numbered roads and the physical road These features include the road classification such as motorway or A road and the nature of the road such as a dual carriageway or slip road OS MasterMap ITN road routing features provide information that complements the road network These includes detail that may affect a driver s choice of route such as mandatory turns or one way streets OS MasterMap Imagery Layer is not part of the feature model as it does not contain individual features but provides a seamless source of orthorectified aerial photography that can be integrated with other layers in OS MasterMap L ARRE OS MasterMap user guide product specification chapter 1 2 v5 1 2 2004 Crown copyright Page 16 In this user guide the term real world object is used to describe a physical entity that can be captured and represented in the data In the extract below real world objects include buildings land and the letter box Not all of what we are representing has a definitive physical presence often we are expressing administrative concepts such as ward boundaries named roads or turn restrictions In the extract below the red dashed line infers a property boundary where no physical boundary has been surveyed K A real world object
80. cates how closely the coordinates of a point in the Imagery Layer agree with the true coordinates of the same point on the ground in Ordnance Survey National Grid Two data capture standards apply to the Imagery Layer Urban and rural areas encompassing all 1 1250 and most 1 2500 topographic basic scale areas as well as a few small 1 10 000 topographic basic scale areas RRR a OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 168 Designated sparsely populated areas encompassing the majority of 1 10 000 mountain and moorland and some 1 2500 topographic basic scale areas The imagery accuracy area coverage map located on the OS web site states which capture standard applies to each tile within the imagery layer Measurables The comparison between the position recorded in the Imagery Layer and the true position of the feature on the ground Conformity Data capture standards RMSE Urban and rural areas 1 4m Designated sparsely populated areas 4 0 m 3 4 m applies to any imagery created from photography flown in areas of designated sparsely populated areas after 1 March 2004 Correction No correction that requires either the return of imagery to the supplier for reprocessing or the capture of new imagery specifically to correct an error will take place unless Ordnance Survey believes that failure to do so would have serious consequences for customers ability to use the data I
81. ch of which covers a nominal square area or part of such a square Data chunks are unclipped that is features that overlap the boundary of the chunk will be supplied in their entirety see Chunking of supply data in chapter 1 9 e For the Topography Layer you have a choice of topological or independent polygons see Reference section OS MasterMap user guide when ordering your data e To speed up the online supply of data and enable areas to be supplied as complete files on CD your data will be compressed using the gzip compression method See Chapter 1 9 RR a a a OS MasterMap user guide product specification chapter 1 1 v5 1 2 2004 Crown copyright Page 15 Chapter 1 2 Overview of OS MasterMap Data overview The purpose of OS MasterMap data is to support a wide range of customer applications that utilise geographical information These may include e geographical analysis e geographical referencing e data association e asset management e route planning and e cartographic representation OS MasterMap topographic features are representations of real world objects including buildings roads tracks paths railways rivers lakes ponds structures such as oil storage tanks and pylons and land parcels The data also includes non topographic features such as administrative and electoral boundaries cartographic text and symbols and postal addresses Each feature has a spatial attribute that is either a topologi
82. change the content of PAF directly feedback is sent to Royal Mail where discrepancies occur between PAF and the Topography Layer These changes may take several months to be reflected in the Address Layer Address components Each address within the Address Layer must contain the following information e postcode and e post town and e organisation name or e PO box number or e building name or number or e sub building name or number OS MasterMap user guide product specification chapter 1 5 v5 1 2 2004 Crown copyright Page 54 This is the minimum information required by the Royal Mail in order to deliver post to an address There are five postcodes used by Royal Mail that are not included in Address These are e Gl for National Giro e BT for Northern Ireland e M for the Isle of Man e JE for Jersey and e GY for Guernsey Alderney and Sark Authorisation of names In Great Britain except in the case of certain administrative names there is no national body responsible for the names and spellings of places appearing on official maps or documents Each administrative area that is district borough unitary authority has a Street Names Authority and a Housing Numbering Authority The record kept by these authorities after agreement with Royal Mail is the authoritative reference supported by an Act of Parliament Personal names There are some occurrences of an occupant s personal name in the data wher
83. common ones are listed Where the mereing relationship of any boundary alignment changes or where a boundary changes from one side of a real world object to another the point of change is shown by a boundary half mereing change symbol usually in opposing pairs The location of the boundary half mereing symbol is coincident with the boundary alignment and not the feature to which it is mered Physical features shown in the administrative boundaries theme e boundary posts e boundary stones and e boundary markers Non physical features shown in the administrative boundaries theme e alignments of boundaries and textual descriptions of boundaries boundary mereings and boundary posts and stones RR a OS MasterMap user guide product specification chapter 1 4 v5 1 2 2004 Crown copyright Page 38 Application of feature code precedence Where two or more boundaries are coincidental a single alignment is shown by the most important boundary in the following order e In England and Wales e county city amp County of the City of London unitary authority district London borough and metropolitan district e civil parish community inner and middle temples e European electoral regions county borough constituencies e Welsh Assembly electoral region e electoral division and or ward e In Scotland e unitary authority e European electoral regions county burgh constituencies e Scottish parliamentary electoral region
84. ct specification chapter 1 7 v5 1 2 2004 Crown copyright Page 89 Turn routing consisting of a No U Turn RRI attributes for no U turn information dateTimeQualifier n a environmentQualifier Instruction No Turn vehicleQualifier n a This feature includes references to the three directed links highlighted in brown in the diagram RR a OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 90 RRI features at specific locations Height restriction coincident with intersection of RoadLink features RoadNodelnformation attributes for feature low bridge at A dateTimeQualifier n a environmentQualifier classification Bridge Over Road vehicleQualifier maxHeight uom metres 4 5 maxCompositeHeight feet uom feet 14 inches uom inches 7 OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 91 Height restriction enforced by a structure such as a railway bridge or footbridge RoadNodelnformation attributes for feature low bridge at A dateTimeQualifier n a environmentQualifier classification Bridge Over Road vehicleQualifier maxHeight uom metres 4 5 maxCompositeHeight feet uom feet 14 inches uom inches 7 OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 92 In this example a road passes t
85. ctual building on the ground Potential uses e incident analysis for emergency services e risk analysis for insurance financial and environmental services e facilities planning for utilities e site location analysis for retailing and e school catchment areas for local government e address list cleaning The Address Layer establishes the link between PAF addresses and all other geographic information including topography transport networks imagery height boundaries land use and any other source of information that has a geospatial context Benefits Businesses involved in the provision of services to the doorstep including gas water electricity and telecommunications need to relate a customer property to their support infrastructures in the street The Address Layer assists customers in meeting these requirements Utility providers are able to quickly identify customers affected by interrupted services through simple routines that correlate the faulty infrastructure with properties supported by those infrastructures The Address Layer enables a two way communication between addresses and other geospatial information For example in a geographical information system GIS a customer can plot the location of addresses on an aerial image or can ring fence an area on the image and identify the addresses in that area in order to communicate with them The accuracy of address location is critical in providing efficient public services
86. d The two line features which fell partly within the selection polygon are changed leaving a line feature outstanding in your system attributes The feature code attribute does not add any extra information to that contained in these descriptive attributes it is determined by rules based on the descriptive attributes Hence the feature code can be ignored by your system without losing any information The same is true of the theme attribute with the exception of line features which as well as being themed based on their own descriptive attributes are also members of the themes of the area features that they bound The feature code and theme attributes are an example of filtering features based on their descriptive attributes Software capable of handling OS MasterMap should provide flexible methods of filtering features which means taking actions based on the descriptive attributes of each feature These actions include sending features into different GIS data layers and applying different cartographic styles to features The OS MasterMap feature code and theme attributes may or may not be useful in doing this depending on your requirements A customisable filter based on descriptive attributes will allow you to effectively set up the data subsets most useful in your application OS MasterMap user guide product specification chapter 1 10 v5 1 2 2004 Crown copyright Page 136 Chapter 1 11 OS MasterMap and positiona
87. d the road routing information will be updated within six months of change occurring in the real world RR a OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 65 Potential uses The data can be used in many ways with the appropriate software It can be used either alone or combined with other products and customers own datasets Possible uses include e Accident analysis e Logistics management e Asset recording and inventory management e Real time traffic control e Catchment area analysis e Road and highway maintenance e Command and control e Road design e Defect analysis e Route planning e Derivation of street gazetteers e Scheduling and delivery e GIS analysis indexing and mapping e Site location Highway planning and engineering e Traffic management e In vehicle navigation and guidance e Vehicle tracking e Locational referencing Roads for inclusion A road is defined as a metalled way driveable by an ordinary vehicle such as a family car where metalling is defined as the systematic application of material to assist the passage of a vehicle Public and private roads are included in the data and the accessibility of any road section of road is indicated by combination of the attributes on the RoadLink and Road Routing Information All public roads will be in the data In the first release of ITN Roads the coverage of private roads and alleys is limited to those present in pre
88. d classification as follows e Atleast 99 of ITN road B classification and above will be correct e Atleast 97 of all other ITN road classification will be correct e Atleast 95 of natureOfRoad attributes will be correct where compared against the OS MasterMap Topography Layer and e Atleast 99 of grade levels will be correct where compared against the OS MasterMap Topography Layer Correction We will aim to correct any reported errors of comission or omission reported to the ITN maintenance team ideally within one month but within a maximum of three months Improvement Ordnance Survey will continue to monitor the data collection processes and to review the specification periodically to reflect customers requirements RRR a a OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 162 Imagery Layer The Imagery Layer comprises existing imagery and new imagery which are defined as follows e Existing imagery orthorectified imagery suitable for the OS MasterMap Imagery Layer created prior to 1 January 2003 e New imagery orthorectified imagery suitable for the OS MasterMap Imagery Layer created after 1 January 2003 The following quality statements are common to both existing and new imagery Completeness Definition Completeness is a measure of the planned national coverage against the actual imagery coverage achieved Measurables e Software validation e Visual check
89. d inner boundaries of an area feature In topological polygon data a polygon consists of a closed chain of line features specified by reference to the TOIDs of those line features Each line feature is used either forwards or backwards in the chain In independent polygon data a polygon consists of an ordered list of coordinated points explicitly specifying the polygon geometry polyline See Reference section OS MasterMap user guide positional accuracy The accuracy of the feature geometry relative to the coordinate spatial reference system RRR a a OS MasterMap user guide product specification appendix A v5 1 2 2004 Crown copyright Page 184 property See attribute In GML documents this term has a formal meaning that is not used elsewhere real time An immediate response The processing of data by a computer as rapidly as the data is input or within some small upper limit of response time This is NOT synonymous with online real world object The real thing represented by a feature For instance a building a section of fence the boundary of a wood a sharp change of gradient rectangle See Reference section OS MasterMap user guide representative point A point feature used to represent a real world object for example centroids seeds area labels Representative points are not included in OS MasterMap data seamless database In the OS MasterMap context this refers to a geospatial database in which there is no co
90. d into OS MasterMap data Measurables The amount of real world change and or RRI that has been incorporated into OS MasterMap within the published timescales Conformity Changes to or new ITN Roads feature alignments are related to OS MasterMap revision of Category A change and will generally be captured within six months of occurring Changes to classification of road networks will generally be captured within six months of occurring Changes to RRI will generally be captured within six months of occurring Correction We will aim to correct any reported errors of comission or omission ideally within one month but within a maximum of three months Improvement Ordnance Survey is seeking to continually improve currency and is investigating the use of pre build and developers plans to make information available at the earliest opportunity RRR a OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 161 Thematic attribute accuracy Definition How accurately the attributes within OS MasterMap record the information about a real world object Measurables The three components of attribute accuracy that can be measured e Feature descriptiveGroup and descriptiveTerm attributes representing attributes of real world objects e reasonForChange attributes correctly reflecting the change through time of OS MasterMap features Conformity ITN road classifications will match the real worl
91. doi E 146 Elm POFAal lt COMSISTSNGCY errors ee E E E E ENS EE A E E ea 146 Temporal validity CUMENCY cccccecgiccheas NT 47 OOO O a ee OS MasterMap user guide product specification contents v5 1 2 2004 Crown copyright Page 9 Appendix A Appendix B Logical CONSISTIR 149 Thematic attribUte aCCUACY eii ii a a ad a asa 150 Address Lai ai ias 152 COMICS R SSS a ad ida lr idad 152 da misii iioaeoei aE aE AE AORERE GEEA AAA DAE ENEE AAN EEA ANA EAO AAE O 53 Temporal Validity CUM idad de 154 A A A NT 155 COMPleleneSS artritis on ti 155 SOMME US TOS IY ar A ideas 156 TEMP ACCURACY a ia 61 Thematic attribute CCU ok 162 HELENA A a a ae E e E e 163 COMPlelenesS orrian ansen nadi i anie ad A aT ENEN 163 GOMES dely sotansa A O O A a Aa Aai NESES 64 Image appearance semi ora A E N SS 165 MosalckiIMBi iaa a ice 166 A casspanteasescectuausectsedsetaainatie catuey aden chansauathetyae aattacerehaseesnuaiac e e a a 167 ABSOlUtS ACC UPA C Yiia isenimine aN a toa 167 NEW IMAGERY ii Rss 168 ADSOlUte ACCULAGCY sure abst na a E E N E A E saci A E E sash cagteacpectutenduumetans 168 Radiometnic acCUraCY esdan i e T E das sate A Re E A E Aaa ea E 70 Known data conformance ISSUES e antenei darsa inini nae aaa a AE E OE E Aea sacetabs ine oneabacde ata sapaphdlacteusadueceastenfeaaacdes 171 COMpleteneS Sorrisi T Eredi acetates RENE eos 171 Temporal ACCUFACY CONSISTENCY irske ds 72 Logical CONSISTE li a e Sates a A EEE EN a aos 173
92. e and will be treated as the same feature even if it undergoes change until the building is demolished The main exception to this principle is the life cycles of line features including topological network line features These are constrained by topological structuring rules and so cannot always follow the life cycle of the real world objects they represent A line feature dissected by another becomes two features This should be borne in mind when considering associating information with line features TOIDs Every OS MasterMap feature has a unique identifier known as a TOID This is a number that uniquely identifies that feature TOIDs hold no intelligence they are allocated sequentially as updates are applied to the database The TOID will stay the same throughout the life of a feature Any data you wish to associate to a feature can be done via its TOID meaning you are attaching information to the whole feature In addition to the TOID AddressPoint features also have an OSAPR Ordnance Survey ADDRESS POINT Reference identifier Each OSAPR corresponds to a TOID OSAPRs are included in OS MasterMap AddressPoint features so they can continue to be used as the primary identifier of postal addresses in applications based on our ADDRESS POINT product OS MasterMap user guide product specification chapter 1 2 v5 1 2 2004 Crown copyright Page 19 Feature version numbers Each feature also has a version number which is incremented
93. e date from which you wish to receive updates from This can be any date but you may wish to make it the date at which you last ordered a supply Change only update can be supplied for your whole contract area or by subset see What s new in version 5 chapter 1 2 Change only update will be chunked see Chunking supply of data in chapter 1 9 and unclipped see What is supplied unclipped data in chapter 1 9 For the Topography Layer the information supplied in change only update is different depending on whether independent polygon or topological polygon data is supplied because an independent polygon area feature includes the full polygon boundary of the area whereas a topological polygon area feature includes only references to line features When some of the line features making up a polygon change only those line features are supplied Therefore systems that use topological polygon data must have access to the other unchanged line features in order to construct the polygon Important note about departed features in change only update files In OS MasterMap change only update data is supplied in multiple files each of which contains a data chunk see Chunking supply of data in chapter 1 9 The same TOID can appear as both a departed feature in one chunk file and as a modified feature in an adjacent chunk The reason for this is that the departed features in each chunk are those that have ceased to exist within the boundary of that c
94. e duration of the licence For information on how to manage your updates see Updating your data holdings in chapter 1 10 a AAA OS MasterMap user guide product specification chapter 1 9 v5 1 2 2004 Crown copyright Page 127 Passwords Customers wishing to order OS MasterMap data will be required to register with Ordnance Survey to open a credit account Once the account has been opened you will be issued with an account number URL for the data selector user name of your own choice and a password The user name and password will be needed to enable you to access the data selector to capture your area of interest and order data from your contract area The first time you log onto the online service you will be asked to change your password to one of your own choosing There will only be one password issued for each customer account regardless of the number of contracts held by that customer The password and user name will only be emailed to the person who has requested the account to be opened All requests for changes to passwords new passwords or updates to passwords will be validated with the person who asked for the account to be set up Please ensure that provisions are made within your organisation to cover for any leave of absence of this person to ensure continuity of use Passwords are the responsibility of each customer and you must ensure that you protect your password from being disclosed or used by any unauthorised person
95. e serious consequences for customers ability to use the data Improvement Resources are directed towards continually improving the acceptable quality levels for radiometric accuracy with each update of the Imagery RRR a OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 170 Known data conformance issues Completeness Feature for the sea OS MasterMap does not include a feature for the sea The effect of this is that beyond the last intersecting feature of a body of tidal water there will be no feature within the data In the case of some large tidal estuaries this will be a considerable way inland Text features There are currently no accents on text features Non intuitive features Not all features are intuitive where real world objects do not exist to bound off logical entities Typical examples are path networks that can extend for considerable distances and are represented by a single feature Inferred links Inferred links have been created to split up some features currently roads and some open plan gardens These inferred links have been generated by software and in some cases are not directly relevant to the ground situation timeQualifiers for ITN Roads RRI features timeQualifiers that apply to exceptions rather than the restriction itself are not present in the first release Tunnels in ITN Roads Tunnels are not described as an environmentQualifier in rele
96. e slopes and cliffs e car parks e gardens e woodlands and e other areas of vegetation including scrub heath rough grass and marshland Non physical features shown in the land theme e text descriptions of some land theme features Rail The Topography Layer of OS MasterMap contains information relating to permanent railways that form communication between two points for example from railway station to railway station or from an industrial building to a private quarry The rail theme contains the names of all stations junctions and termini RR a a OS MasterMap user guide product specification chapter 1 4 v5 1 2 2004 Crown copyright Page 42 Standard gauge railways are shown to scale by a pair of rails separated by the correct distance of 1 435 m Railways narrower than 1 435 m are deemed to be narrow gauge and are shown by a single line representing the central alignment Tramways metros and light rapid transit systems are treated as railways Underground portions of the Metropolitan and District lines in London that are close to surface level are shown Where a deep level tube railway comes to the surface and continues as a normal railway it is shown as a standard gauge railway In other cities only the sections of underground railways that are open to the sky are currently shown Physical features shown in the rail theme e level crossings e switches and slips e lighting towers e retarders e loading gauges e br
97. e such as paths and tracks inferred links and some very large features Transitory incorrect features The tile based update of OS MasterMap means occasionally features will not be formed correctly This is indicated by the attribute lt broken true gt Whilst logically correct in that they meet the specification such features are of limited use to customers At April 2002 0 13 of area features which cover 0 14 of the total surface area of Great Britain fell into this category Landform area features Some landform area features do not have the required line geometry to form correctly In these cases the line geometry will be supplied but no area feature created Typical features affected are pits cliffs and coastal slopes Landform features do not topologically structure with other features in the land theme Therefore this does not prevent complete area feature coverage from being generated Some landform features are being improved and will be made available in a future release of OS MasterMap Update of OS MasterMap Topographic and ITN Roads data OS MasterMap Topographic data and ITN Roads data are currently updated semi independently Because of this when change occurs there may be a small delay until both themes are synchronised to include information about the same real world change This may either manifest as a road feature in the ITN Roads theme not within the Topography theme or vice versa This also has an imp
98. e this is the only form of address for the property These are shown as on PAF and will appear contained in brackets Data Protection Act 1998 Ordnance Survey is responsible for including OS MasterMap and the Address Layer in its notification to the Information Commissioner This advice relates to the basic Address data Customers who link additional data to the Address Layer will need to consider the requirements of the Act Ordnance Survey strongly advises customers to contact the Commissioner where this is the case RR a OS MasterMap user guide product specification chapter 1 5 v5 1 2 2004 Crown copyright Page 55 Representation of addresses Organisation name The organisation name is the business name given to a delivery point within a building or small group of buildings For example TOURIST INFORMATION CENTRE HIGH STREET This field could also include entries for churches public houses and libraries Department name In a few organisations department name is indicated because mail is received by subdivisions of the main organisation at distinct delivery points For example ABC COMMUNICATIONS Organisation name MARKETING DEPARTMENT Department name LONDON ROAD Thoroughfare Post office box A post office PO box is a non geographic address assigned a number by Royal Mail As these are non geographic and cannot be matched to the customers address Ordnance Survey will match them to the delivery office from which they
99. e to an OS MasterMap feature they may not reflect the number of real world changes a feature has undergone For example a building may be modified two or three times before Ordnance Survey captures all of the changes in one operation A feature that exists across more than one Ordnance Survey historic tile will have its version incremented by however many tiles are affected for what may be only one real world change In some cases the initial incarnation of a feature will have a version greater than one Versions are an effective method of ensuring that the same incarnation of a feature is being referred to However a high version number does not always indicate a real world object that has been subject to a large number of changes Update Features may be supplied as a new version without any change being apparent to the customer This is due to changes in attributes that modify a feature but that attribute is not supplied to a customer OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 172 Logical consistency Quality improvement and life cycles of OS MasterMap features Quality improvement initiatives to create more logical features will result in update that may create new versions or even delete existing features and replace them with new ones This will not be reflecting any real world change The number of features affected is likely to be small and is limited to particular types of featur
100. eas through our Positional accuracy improvement programme http www ordnancesurvey co uk positional OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 144 Absolute accuracy Definition Absolute accuracy is a measure that indicates how closely the coordinates of a point in the dataset agree with the true coordinates of the same point on the ground in the British National Grid reference system Measurable The comparison between the position recorded in the data and the true position of the feature on the ground Conformity Ordnance Survey has continually sampled data and tested the absolute accuracy of well defined points of detail The aggregated average results of this testing over the last 30 years show that the absolute accuracy of existing data is as shown below in table Data capture standards original capture scale 99 confidence level Current accuracyOfPosition attribute value Rural overhaul 1 2500 pre positional accuracy improvement lt 5 8m lt 6 0m Mountain and moorland 1 10 000 NOTE these differences are due to Ordnance Survey refining the positional accuracy statements The accuracyOfPosition attribute values will be revised to reflect this in a future release OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 145 Example of absolute error statistic Urban 1 1250 If the coordinates of a
101. ed The feature version number is incremented 3 An area of non coniferous trees has been incorrectly assigned the descriptive term coniferous trees by photogrammetric revision techniques The feature is reclassified and retained The feature version number is incremented 4 A building foundation captured as a feature with descriptive group unclassified is completed and the feature is reclassified to descriptive group building The feature is retained The feature version number is incremented Line feature life cycle rules Line features in OS MasterMap are not persistent in the manner of area and point features This is because line features are maintained by topological structuring rules If a line feature is intersected by another line it is broken at the intersection This means that a single linear real world object is often represented by several line features There is no concept in OS MasterMap of a line feature that is made up of multiple line geometry elements This limitation has significant impacts making life cycles of line features difficult to manage For example A fence cuts a field in two A new fence is built at right angles to the original to further divide one half of the field Although the old fence has not changed at all it will be split into two separate line features Before one After one real world object real world object one line feature two line fea OS MasterMap user guide product specification chapter
102. ed excavation below the ground surface either without disturbance of the ground surface above or where a replacement of the ground surface occurred after excavation This does not include obscured detail but it does include tunnels and subways Because of their nature tunnel alignments are not captured to the same accuracy as features on the surface Obscured level Where more than one level of detail exists all detail that meets the specification for capture positioned below cartographic surface level and either at or above ground surface level is captured as obscured detail Parallel features Where a fence hedge or wall runs approximately parallel to another feature and so close that they cannot both be plotted correctly at scale of survey then only one feature is shown in OS MasterMap In determining which feature to include the following hierarchy is used by the surveyor 1 Include if the feature is used to mere an administrative boundary 2 Include if the feature appears to define the extent of a property 3 Include if the feature appears more important for example if there is a hedge next to a cattle protection fence show the hedge Topography Layer themes The Topography Layer is broken down into nine themes administrative boundaries buildings heritage and antiquities land rail roads tracks and paths structures terrain and height and water These themes make it easier to access specific elements NOTE The following
103. ed feature actually deleted these are the ones with TOIDs that do not occur as modified features in any chunk by cross referencing between the two passes through the chunk files Increasing your data holdings Existing contracts can be expanded online You can add more themes increase the number of terminals licensed to access the data and extend the geographic area You can also enter into new contracts for other layers of data It is not possible to remove any of the existing area of interest or decrease the number of themes of an active contract OS MasterMap user guide product specification chapter 1 10 v5 1 2 2004 Crown copyright Page 133 Renewing your contract When a contract expires you will be able to renew it online This will in effect create a new contract which will be a copy of the original with new start and end dates You will be able to do this within the last thirty days before the contract expiry date The start date of the new contract will be the day after the end date of the original one You will be prompted that your licence is due for renewal by email telephone or letter If you wish to cancel a contract please refer to the cancellation provisions of your OS MasterMap contract File names Each file supplied except Imagery has the following format nnnnnn linnnn nninnnn for example 123456 SU1212 2i3 This example is broken down as follows e 123456 is the order number e U1212 is t
104. eives mail it is deleted from the PAF update of which is supplied monthly to Ordnance Survey Following processing the corresponding AddressPoint feature in OS MasterMap is removed from the database A record is kept in the database to indicate that a feature with this TOID used to exist which is used to supply departed feature information in change only update Modification of AddressPoint features due to real world change When the Royal Mail changes a PAF address such as amending some of the address details this is included in the monthly PAF update received by Ordnance Survey Ordnance Survey may change a feature by improving the match location or identifying a potential discrepancy In either of these cases the AddressPoint feature is updated and given an incremented version number and the date on which the new version became current is supplied by the versionDate attribute Modification of AddressPoint features due to error correction Error corrections are treated in the same way as modifications of features due to real world change a A TL OS MasterMap user guide product specification chapter 1 8 v5 1 2 2004 Crown copyright Page 112 ITN Roads feature life cycle rules Creation of ITN Roads features When a new ITN Roads real world object comes into being a new ITN Roads feature is created in the database to represent it Deletion of ITN Roads features When an ITN Roads real world object is no longer present
105. ented and the date on which the new version became current is stored If however the real world object has undergone change such that it is not considered to be the same object as before the area feature representing it is deleted and one or more new features created Alterations due to positional accuracy improvement PAI or any other error correction of Ordnance Survey data that is not related to real world change are treated as detailed in Modification of line features due to error correction later in this chapter Changes to geometry of area features When a real world area object expands or contracts due to alteration to its boundaries yet is considered to be the same real world object the corresponding feature is retained with unchanged TOID For instance the area feature representing the back garden of a residential property is retained even if it is greatly reduced or increased in size This is because its identity as the representation of the garden of a particular property means it can be considered the same feature despite extensive changes to its geometry If it is not clear whether the real world object after modification is the same object or a new one the following considerations are used as a guideline e ls there topographic information to suggest the function of the resultant real world object is the same as that of the original e Is the resultant real world object more than half the size and less than twice the size o
106. equences for customers ability to use the datalmprovement Resources are directed towards continually improving the image appearance with each update of the imagery Mosaicking Definition The process of creating a single image of a defined geographic area from a number of smaller images of the same geographic area Measurables e Join visibility e Colour and contrast balancing across the constituent images with the exception of seasonal variances e Image consistency RRR a OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 166 Conformity Visual inspection by Ordnance Survey will ensure that all imagery has The apparent lines indicating the seam between images flight lines and blocks is kept to a minimum and should not obscure or blur the resultant image However some visible joins are acceptable if the colour difference is slight Colour and contrast will be balanced across the different orthorectified aerial images within the blocks The occurrence of colour and contrast differences will be minimised Image consistency within the blocks is achieved Correction No correction that requires either the return of imagery to the supplier for reprocessing or the capture of new imagery specifically to correct an error will take place unless Ordnance Survey believes that failure to do so would have serious consequences for customers ability to use the data Improvement Res
107. er enhance the standard of aerial imagery The standards we have set for newer imagery from January 2003 onward therefore reflect those advances particularly in absolute and radiometric accuracy Image metadata Metadata files are provided for each image file These files contain the following information Metadata propert Cardinalit copyright Ordnance Survey c Crown Copyright 2002 SU3608 dateFlown 2002 07 21 437000 109000 nominallmageScale 1 10 000 nominalAbsoluteAccuracy 1 1 or 4 0 2 There will be one dateFlown element if the image was flown on a single day or two dateFlown elements representing the first and last dates flown Dates have the format of CCYY MM DD Coordinates in metres Millimetres RMSE in metres 3 4 m applies to any imagery created from photography flown in areas of designated sparsely populated areas after 1 March 2004 Metres Megabytes to 3 decimal places Choice of GPS and OSTNO2 NG From Traditional Control or Land Line Name of supplier 1 J 1 1 k 5S 1 0 25 46 877 1 1 1 1 Ordnance Survey Orthorectified OS MasterMap user guide product specification chapter 1 6 v5 1 2 2004 O Crown copyright Page 63 Where imagery has been merged from more than one source with different properties it is possible that small areas of imagery within a 1 kilometre square will not match the metadata values particularly in rural areas
108. es to archaeological information Relate to feature Notes 1 Where the capture of a new property and its associated features is incomplete at the time of recording the change 1 0 HU should be recorded for the complete building and 0 25 for the associated features 2 These could be an extension to existing buildings or the extension of a development to include new roads car parks fences and buildings In the case of a building being extended with minimal change to its immediate environment only the building area is used to calculate the HU value Where the change includes building extensions new buildings and associated features such as additional car parks roads and boundary features the area of the change is used to calculate the HU value 3 The HU count of the motorway or dual carriage is all features that lie within the real or perceived boundaries of the highway 4 This is the linear measurement of the pecked line used to define the extent of an area of vegetation where there are no other features bounding the area NOTE To ensure consistency software should be used for the linear and area measurements required to give an HU value OS MasterMap user guide product specification appendix B v5 1 2 2004 Crown copyright Page 192 Appendix C Product and service performance report form Ordnance Survey welcomes feedback from its customers about OS MasterMap If you would like to share your thoughts with us please print a copy of t
109. f the original e Does the majority of the extent of the resultant real world object lie within the bounds of the original e ls the resultant real world object the obvious logical successor to the original If the continuation of the feature cannot be justified on one or more of these grounds the feature is deleted and replaced with a new feature a AE OS MasterMap user guide product specification chapter 1 8 v5 1 2 2004 Crown copyright Page 105 Examples 1 A private house is extended The building and garden features are retained 2 A field changes shape and reduces in size due to the realignment of one of its boundary fences alongside a road The field feature and the adjacent road features are retained Splitting of area features When a real world area object is split into two or more separate real world objects one of the features may be clearly recognisable as the original real world object If this is the case then the feature is retained If it is not clear whether one of the resultant features represents the same real world object as the original feature then the following considerations are used as a guideline e s the function of one of the resultant real world objects the same as the original e s one of the resultant real world objects the obvious logical successor to the original e Does one of the resultant real world objects occupy more than half the area of the original If the continuation of the feature canno
110. fier is that the routing information applies to all vehicles at all times All RRI features have environment qualifiers to indicate the nature of the information Where the information only applies at specific times a dateTimeQualifier is used Where the use type load or vehicle height are relevant to the applicability of the information then a vehicleQualifer is used In some cases routing information specifically does not apply to certain vehicles This is indicated by the use of an exceptFor clause which if set to true indicates that the information does not apply to the specified class of vehicle use type or load It should be noted that routing information is not necessarily restrictive for example Access Limited To indicates the vehicles that can access a RoadLink as opposed to Access Prohibited To which indicates those vehicles that cannot e exceptFor clauses only apply to the use type or load parts of a vehicleQualifier e exceptFor false this is the default the routing information applies to the specified type s of vehicle only e exceptFor true the routing information does not apply to the specified type s of vehicle RR a a OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 95 RRI with exceptions PEDESTRIAN ZONE Except buses permit holders and taxis In this example there is a pedestrian zone indicated by the No Motor Vehicles sign t
111. ght where due to the nature of the real world object they represent or the way the data is structured a different approach is followed Road features These will generally persist as named or numbered roads only rarely will they completely cease to exist in the real world 1 The addition or subtraction of component RoadLink features or other change of attribution will result in the Road feature persisting and its version increasing 2 If RoadLink features referenced by a Road feature are altered but not deleted the feature will persist without an increase in version 3 A renamed Road feature or part of a Road feature will be created as a new feature any portion of the original road will persist with a new version RoadLink RoadLink features do not have a definitive relationship to the real world for some users they represent simply a connection between two points whose geometry is irrelevant for others they represent a specific section of a road that no longer exists if a degree of change occurs 1 Where a RoadLink feature is shortened or lengthened it should persist the version will increase 2 A RoadLink feature that has its alignment changed for example highway improvements should persist where possible the version will increase 3 Where any change of attributes alone has occurred the feature should persist the version will increase 4 Change of road name or number alone will not result in update to RoadLink features
112. hange password button within the data selector to change your password Please ensure that you notify all concerned within your organisation of this change as we will not disclose it to others within your organisation Please remember to keep your password secure ae E OS MasterMap user guide product specification chapter 1 9 v5 1 2 2004 Crown copyright Page 128 Estimate validity and retention Estimates created and saved by a customer will be given a unique reference number and are valid for 30 days or until the next price change is implemented if sooner We advise you to recalculate any estimate prior to placing an order to ensure that the automatic calculator uses the current prices Ordnance Survey will retain these estimates for a period of six months after which time they will be deleted from our systems No warning will be given before these estimates are deleted Customers may at any time during those six months access any estimate they have saved by using its unique reference number Ordnance Survey reserves the right to vary the prices of its products but shall give you notice in accordance with your OS MasterMap contract Cookies The OS MasterMap data selector makes no use of client side cookies These cookies are normally held on the filing system on the browsing PC and are the type of cookie that some organisations users have disabled for security reasons We use session cookies These are not stored on your hard dr
113. hat has time and vehicle type exemptions It is assumed that the same restriction applies to traffic in either direction RoadLinklnformation attributes dateTimeQualifier specifiedTime startTime 08 00 endTime 18 00 environmentQualifier instruction Access Prohibited To vehicleQualifier type exceptFor True Buses use exceptFor True Taxis use exceptFor True Permit Holders OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 96 In this example only the specified vehicles are allowed access into a road It is assumed that the same restriction applies to traffic in either direction RoadLinklInformation attributes dateTimeQualifier n a environmentQualifier instruction Access Limited To vehicleQualifier type exceptFor False Buses type exceptFor False Cycles use exceptFor False Taxis OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 97 Further examples of RRI features with exceptions No entry except for buses The restriction here is No Entry for all vehicles except buses dateTimeQualifier n a environmentQualifier instruction No Entry vehicleQualifier type exceptFor True Buses No access except emergency vehicles The restriction is an Access Prohibited To all vehicles except for the specified vehicles dateTimeQualifier n a environmentQualifier instruction
114. he 1 km square in which the south west corner of the chunk falls see Chunking supply of data in chapter 1 9 e 2is the chunk size in this case 2 km by 2 km this will be set to 5 for 5 km by 5 km or 10 for 10 km by 10 km e iis a flag indicating that the data selection polygon does not completely fill the chunk square if it does this will be shown as a c If an area selection contains no data then the data file will not be supplied however a reference to the empty chunk file will be shown by the letter e in the filename and e 3 sa counter see Counters below to provide a unique filename in the case of multiple chunk files within 1 chunking grid square This can have a value between 1 and 9999 Each Imagery file is supplied in a 1 km by 1 km square and has the following format with the date being the date flown e OSIM_SU4657_2002 03 24 tif When a km has been cropped because of the area selected the file naming convention will be OSIM_SU4657_2002 03 24_part tif RRR OS MasterMap user guide product specification chapter 1 10 v5 1 2 2004 Crown copyright Page 134 Imagery file sizes are estimated to be File format Sub format Compression type Files supplied Typical size for 1 km TIFF Uncompressed tif tfw 47 Mb JPEG JPEG compression jpg 32 Mb ECW Wavelet compression ecw 1 5 Mb MrSID Wavelet compression sid 1 5 Mb Counters As outlined in Chunking supply of data in chapter 1 9 when a data selection polygon
115. he Ordnance Survey Address Layer Conformity The monthly PAF update is processed and updated into the Ordnance Survey Address Layer generally within a month of being received Correction Any reported errors of comission or omission are addressed by Royal Mail or Ordnance Survey Ordnance Survey will endeavour to rectify errors within its remit ideally within one month but within a maximum of three months Improvement Ordnance Survey will continue to monitor processes and to review the update of OS MasterMap addresses periodically to meet customers requirements RRR RRA OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 152 Geometric fidelity Definition Geometric fidelity is a measure of the correctness of the spatial relationship of AddressPoint features to either a building or structure in the OS MasterMap Topography Layer or an estimated position on the National Grid Measurables The coordinates of AddressPoint features that refer to a building or structure in the OS MasterMap Topography Layer will lie within the boundaries of the area feature representing that building or structure Conformity A total of 100 of AddressPoint features referring to a building or structure in the OS MasterMap Topography Layer will lie within the boundaries of the area feature representing that building or structure Correction Ordnance Survey will endeavour to correct geometric fidelity
116. he existing themes or the classification of OS MasterMap features Themes of line features that bound area features In addition to being a member of each theme for which it passes the theme rule a line feature that is part of the boundary of one or more area features is also a member of the themes of those area features So any line feature that bounds an area feature that is a member of the roads tracks and paths theme is also a member of the roads tracks and paths theme in addition to any other themes to which it belongs OS MasterMap user guide product specification chapter 1 3 v5 1 2 2004 Crown copyright Page 24 Simple example of themes Consider two area features representing a building coloured red in the diagram and a section of pavement coloured grey in the diagram They are bounded by three line features coloured blue green and orange in the diagram line features building area feature path area feature Application of the theme rules The area feature representing the building has a descriptiveGroup attribute with the value Building so it passes the rule to be a member of the buildings theme It does not pass the rules of any other themes The area feature representing the pavement has a descriptiveGroup attribute with the value Path so it passes the rule to be a member of the roads tracks and paths theme It does not pass the rules of any other themes The two line features coloured blue and green in the
117. he named Road features 3 If one of the named roads only extends either side of a roundabout then the roundabout RoadLinks will be referenced by that named Road feature 4 If more than one named road extends either side of a roundabout then the named road that is coincident with any prioritised DfT numbered Road feature will refer to the roundabout RoadLink features 5 If more than one named road extends either side of a roundabout and no DfT road numbering hierarchy exists then the RoadLink features may be referenced by one of the named Road features if it can be identified as having more significance 6 If significance cannot be identified then the RoadLink features at a roundabout are not referenced by any Road feature Examples of named Road features at junctions and roundabouts are on the following pages OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 71 Named roads at a roundabouts In this example only London Road extends either side of the roundabout Therefore the roundabout RoadLink features are referenced by the London Road Road feature OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 72 Manchester Road In this example both London Road and Manchester Road extend either side of the roundabout However London Road is coincident with the A27 which takes priority over the A32 therefore t
118. he roundabout RoadLink features are referenced by the London Road Road feature i A EOD OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 73 Named roads at a junctions Y In this example High Street is identified as the continuous road and the RoadLink features will be allocated accordingly Silver Street will be a single Road feature unless the distance exceeds the set tolerance OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 O Crown copyright Page 74 Road geometry The general alignment of the road carriageway is represented in the data by RoadLink features RoadLink features have information about the geometry of the link the type of road the link represents such as motorway A road and so on and information about the nature of the road the link represents such as single carriageway dual carriageway slip road and so on Additionally the length of the link and references to the node features at either end of the link are included Grade separation information is included to indicate any restriction on accessibility from one link to another where they cross at bridges flyovers and so on The geometry of RoadLink features will fall within the topographic polygons that represent the road carriageway and there is a reference from the RoadLink feature to the TopographicArea features it intersects Road intersections The road netw
119. he routing features are directed indicating the direction of the one way route There is no requirement to capture any mandatory left turn features at points 1 2 or 3 because this information is already available by the presence of the one way information on the links being joined Where a traffic island over 8 m interrupts traffic flow at a junction of a road the link is split for example ym In this example there will be two RoadRoutelnformation features to represent the one way restrictions either side of the traffic island RoadRoutelnformation attributes dateTimeQualifier n a environmentQualifier Instruction One Way vehicleQualifier n a There is no turn restrictions to indicate that access from A to B and B to A may be impossible undesirable or dangerous OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 86 Partial One way and time dependent No Entry Maple Street Elm Street SAY ALO A single RoadLink may be subject to a one way segment that only applies to part of the link RoadPartialRoutelnformation attributes dateTimeQualifier n a environmentQualifier Instruction One Way vehicleQualifier n a In this case the start location A and finish location B of the restriction along the RoadLink are supplied as part of the feature The direction of the restriction is specified in the relationship to the RoadLink OS Maste
120. his form and when completed post or fax it to the address below YOUHAS wsistdidesancasslclitaiabaindedienamedimavandasin oii Gaudstdadsdaesadsdinntanaeateveddatwetiaineraiten PRONE iaa aaa ORGANISATIONS taste E E EO adn N FAK eee aera tages r a E Er E E N RE No D Ere e PE E E EE E E E E A EM iio O A uo gan A A Customer account NUMDET eoccccccncccnnnononccnnnnnnnnnnnorcnnnnnnnnnnoninonnnnns A ianssduastdassandusavadsentesnasianaanionagesnenn Date of submission Of fOrM oooooccccncnncnnnnnorccnnanonononinencnononononanonos Please record your comments or feedback in the space below We will acknowledge receipt of your form within 3 working days and provide you with a full reply or a status report within 21 working days If you are posting this form please send it to Customer Contact Centre Ordnance Survey Romsey Road SOUTHAMPTON SO16 4GU Fax 023 8030 5477 OS MasterMap user guide product specification appendix C v5 1 2 2004 Crown copyright Page 193
121. hrough a stream RoadLinklnformation attributes for feature at B dateTimeQualifier n a environmentQualifier classification Ford vehicleQualifier n a The distance along the link and the National Grid coordinates of the ford are given as part of the RoadLinkInformation feature OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 93 B3181 A38 Where the priority at a junction cannot be inferred either by the geometry or classification of the intersecting roads then RoadRoutelnformation feature with an environmentQualifier classification of Through Route is captured It is assumed that higher DfT classification roads have priority over lower classification roads In this example traffic can travel unhindered from the A38 onto the B3181 in both directions as indicated by the road markings RoadRoutelnformation attributes for through route information dateTimeQualifier n a environmentQualifier classification Through Route vehicleQualifier n a This feature includes references to the RoadLink features forming the through route RR a a OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 94 Use of qualifiers and exceptions on Road Routing Information Qualifiers are used to indicate if routing information applies to anything less than all vehicles at all times The default in the absence of a vehicleQualifier or dateTimeQuali
122. hunk since the change since date you specified A feature may be departed because it has moved outside the boundary of the chunk In other words each chunk file reports change only update with respect to the boundary of that chunk and without knowledge of the other chunks in your order RRR OS MasterMap user guide product specification chapter 1 10 v5 1 2 2004 Crown copyright Page 132 This can occur for instance when a feature used to lie partly inside the chunk in question but is now reduced in size so it no longer intersects that chunk but is wholly within an adjacent chunk In this case it is reported as a departed feature in one chunk and as a modified feature new version in the adjacent chunk Feature version 1 If you process change only update chunk files one at a time deleting all departed features from the data holding you might be deleting some features that should still exist because they are departed for the reason above This problem can be avoided by making two passes through the set of change only update files the first pass applying departed features from all chunk files and the second pass applying new or modified features from all chunk files Chunk files If your system archives non current OS MasterMap data and takes different actions in the cases of deleted features and superseded versions of features that still exist you need to check which departed features are modified feature version 2 Delet
123. iated with new roads Electricity transmission lines ETLs including pylons and supporting posts 2 per 100 m Traffic calming measures 0 25 per line feature Pipelines 2 per 100 m Sea defences 2 per 100 m of linear feature New or additional distinctive names 1 per name Communication masts 1 per mast Quarries reservoirs ponds and lakes 1 per 100 m of bounding feature Major changes to river courses and water features including the addition of landings 2 per 100 m stages and jetties Tracks and made paths 2 per 100 m Unmade paths 1 per 100 m Changes in surface forestry or vegetation classification 1 per change Changes in extent of surface forestry or vegetation classification see note 4 1 per 100 m of pecks RRR OS MasterMap user guide product specification appendix B v5 1 2 2004 Crown copyright Page 191 Feature description Value Fences hedges ditches and walls that are not specifically property boundaries 1 per 100 m Demolition or deletion of a feature 25 of HU value of demolished feature Alteration to existing house name or number 1 per 5 Extensions or alterations to car parks including addition of fencing traffic islands or 1 per 100 m of pecks or roundabouts within car parks fencing Garages and blocks of garages not captured during initial development 0 25 per garage Mean high and low water 1 per 100 m Selected street furniture guide posts milestones and water taps 0 25 per feature Chang
124. ide please complete the Product and service performance report form at appendix C Liability Ordnance Survey is only responsible for producing data and providing it to our customers on either media or via FTP file transfer protocol server Any advice or explanation provided by Ordnance Survey regarding your use of the data is for guidance only and it is your responsibility to ensure that goods ordered are suitable for your intended purpose We cannot accept responsibility for the content of any third party web sites referenced in this user guide Terms and conditions of data use A full description of the terms and conditions of supply and use of OS MasterMap is detailed in the customer contract held by you or your organisation User guide copyright This user guide is Crown Copyright 2003 All rights reserved It is supplied with OS MasterMap to allow you to make effective use of the data Any part of the user guide may be copied for use internally in your business although you should check the Ordnance Survey web site from time to time for the latest version Printing of this user guide If you wish to print this user guide it is suggested that it is bound on the left side OS MasterMap user guide product specification preface v5 1 2 2004 Crown copyright Page 2 Trademarks Ordnance Survey the OS Symbol ADDRESS POINT Boundary Line DNF Land Form PROFILE Land Line OS MasterMap OSCAR OSCAR Asset Manager OSTN97 a
125. idges and viaducts e turntables e mail pickups e mile or kilometre posts and stones e rails e sand drags e permanent way and e signal posts bridges and gantries e station buildings and platforms Physical features not shown in the rail theme e minor railway related features such as e telephones associated with level crossings e conductor rails and overhead wires for electrified trains e detail beneath the roofs of railway stations e water troughs and e repetitive features such as signal lights within marshalling yards Non physical features shown in the rail theme e text descriptions of all railway and associated railway features RR a a OS MasterMap user guide product specification chapter 1 4 v5 1 2 2004 Crown copyright Page 43 Roads tracks and paths Roads For Ordnance Survey purposes a road is defined as a metalled way for vehicles Roads that form part of the public network and those that are private and over 100 metres in length are included with the Topography Layer Tracks A track for Ordnance Survey purposes is defined as an unmetalled way that is clearly marked permanent and used by vehicles Tracks are only recorded in private gardens if they are 100 metres or more in length They need not be all weather All tracks are described as Track or Tk if required to be abbreviated Distinctively named tracks have their name recorded for example HICKS LANE Track Paths For Ordnance S
126. ing and a northing coordinate unclipped data supply All features that wholly or partly lie within the query area are supplied and the full geometry of each of these features will be included in the supply OS MasterMap data is supplied unclipped unit of supply The definition of the way in which the area of order is broken up into manageable physical units that is files for supply to the customer version See version version date See Reference section OS MasterMap user guide version number A version number will identify that a feature has been altered Version numbers will be allocated sequentially with version 1 representing the creation of the feature XML Extensible Mark up Language A flexible way to create common information formats and share both the format and the data on the Internet Intranets and elsewhere XML is extensible because unlike HTML the mark up tags are unlimited and self defining XML is a simpler and easier to use subset of the Standard Generalised Mark up Language SGML the standard for how to create a document structure OS MasterMap user guide product specification appendix A v5 1 2 2004 Crown copyright Page 187 Appendix B Categories of change Category A e New housing and associated features including demolition but excluding extensions to private dwellings e Commercial industrial community and public sector buildings and associated features including extensions to exist
127. ing buildings greater than 0 25 hectares and any demolitions of similar size e Communications networks roads including carriageway alterations due to traffic calming schemes railways airports transmission lines communication masts and so on and associated features including demolition e Road Routing Information such as restricted turns one way streets and so on e Distinctive names associated with the above e Major sea defences designed to reduce the risk of flooding to the coastal areas e Major non coastal flood defences designed to reduce the risk of flooding e Property boundary fences when part of a major refurbishment programme that makes a significant impact on map data e Traffic calming measures e Mobile park homes that are permanent residential properties with a postal address e Major landscape changes gt 0 5 km for example landfill quarries and coastal changes RRR OS MasterMap user guide product specification appendix B v5 1 2 2004 Crown copyright Page 188 Category B In general all features not defined as category A or category C will be considered to be category B the following are typical examples e Significant agricultural and horticultural buildings gt 0 25 hectares in size e Other agricultural and horticultural buildings lt 0 25 hectares in size e Quarries and other surface workings e Field boundaries e Water features ponds lakes rivers canals landing stages and jetties and so
128. ing features will result in the deletion of any existing feature and the creation of a new one except in the circumstances outlined below Changes to an existing feature for example to the dateTimeQualifier which does not involve addition or subtraction of RoadLink references for the feature should be retained with a new version Any real world change to RoadRoutelnformation features that involve addition or removal of RoadLink feature references will retain the feature only if the first and last RoadLink features are the same as the original feature Otherwise a feature will be deleted and a new one created ae EA OS MasterMap user guide product specification chapter 1 8 v5 1 2 2004 Crown copyright Page 116 Chapter 1 9 Guide to using the OS MasterMap data selector The OS MasterMap data selector is an online service provided by Ordnance Survey that allows account customers to e create and save estimates for OS MasterMap data e view estimates and convert to contracts online e view contracts for OS MasterMap data that have been converted from estimates online or off line e place orders for OS MasterMap data based on those contracts or previous orders e schedule change only update supply on a regular basis and e receive orders on media or download orders for OS MasterMap data from an FTP server All customers who wish to order data must have an account which is set up using the registration facility on the OS MasterMap pages
129. ing towers uncovered tanks bridges and monuments are shown within the structures theme The specification for the capture of glasshouses has recently been clarified Only glasshouses over 50 m that serve a horticultural purpose will continue to be seeded as glass structures Other glass structures such as office buildings and conservatories exist within OS MasterMap These will generally be updated through deletion Non physical features shown in the buildings theme e house numbers e descriptive building names and e distinctive building names RR a a OS MasterMap user guide product specification chapter 1 4 v5 1 2 2004 Crown copyright Page 40 Heritage and antiquities For Ordnance Survey purposes antiquities are defined as existing artificial features of a date not later than AD 1714 the date of the accession of George together with very important sites of battlefields and natural features connected with important historical events Exceptionally features and sites of a date later than AD 1714 may be treated as antiquities if they are of national importance The investigation recording and surveying of archaeology is the responsibility of the three Royal Commissions on Ancient and Historical Monuments RCAHMs England Scotland and Wales Antiquity find sites are not shown in OS MasterMap Ordnance Survey has no responsibility for defining the authenticity of distinctive or descriptive names of antiquities Physical
130. istency with which the relationship between the perceived life cycle of real world objects can be mapped to the life cycle of the feature OS MasterMap user guide product specification chapter 1 8 v5 1 2 2004 Crown copyright Page 102 Definition of terms Address A feature stored in the database that represents a Royal Mail postal address deletion The removal of a feature from the Ordnance Survey database descriptive group The feature attribute that classifies the feature into a category such as Building or Landform feature The item stored in the database that represents a real world object part of a real world object or several real world objects real world object A physical building road area of land or other topographic entity TOID The unique integer allocated to a feature version Each change to the feature will be identified by an increase in version number and a change to the versionDate This ensures that users can be sure that they are referring to the same version of a feature OS MasterMap user guide product specification chapter 1 8 v5 1 2 2004 Crown copyright Page 103 Area feature life cycle rules The flowchart below shows the process followed whenever a real world object represented as an OS MasterMap area feature appears changes or is removed from the landscape The rules are described in more detail in the following sections especially the guidelines we use to answer the question in the
131. ith the Road Network theme RRR a a OS MasterMap user guide product specification chapter 1 2 v5 1 2 2004 Crown copyright Page 21 Imagery Layer OS MasterMap includes an Imagery Layer that is orthorectified enabling customers to use imagery in conjunction with other layers in OS MasterMap Data format OS MasterMap with the exception of the Imagery Layer is supplied in compressed GML format GML was developed by the Open GIS Consortium OGC a global organisation of developers and users that aims to maximise the benefit of geographic information GML is a spatially enabled dialect of XML schema More details on GML can be found in the Reference section OS MasterMap user guide The Imagery Layer is supplied in TIFF JPEG MrSID or ECW formats with imagery metadata in XML OS MasterMap source OS MasterMap topographic data is sourced from our topological large scale dataset from which the Land Line product is also derived The Address Layer is derived from the PAF which we have matched to buildings in the Topography Layer where such a building exists or to an approximate position The basis for the ITN Roads Layer was the OSCAR Asset Manager product supplemented by a significant quality improvement flowline to ensure geometric sympathy with the Topography Layer There was also a large data collection exercise to add a richer classification and to capture road routing information The data is captured and maintained primari
132. ive If you are ordering data for collection from the FTP server please ensure that your firewall and Content Management Systems will allow access to Ordnance Survey FTP and web servers Storage of the data should also be considered when taking data via FTP You will need to ensure that you have sufficient storage available to hold the amount of data requested see volume indicator on the data selector when ordering a AE OS MasterMap user guide product specification chapter 1 9 v5 1 2 2004 Crown copyright Page 121 Transfer rates Download speeds using a modem may be affected by your Internet service provider connection It is not possible to predict data download times exactly However the following estimates covering all nine themes of the Topography Layer should offer some guidance 1 Carmarthenshire 410 Mb Using a 56 6 Kbps modem 20 hours 42 mins 512 Kbps 1 hour 49 mins Using a 128 Kbps ISDN 7 hours 18 mins 1 Mbps 55 mins 2 Edinburgh 290 Mb Using a 56 6 Kbps modem 14 hours 36 mins 512 Kbps 1 hour 17 mins Using a 128 Kbps ISDN 5 hours 6 mins 1 Mbps 39 mins 3 Horsham 180 Mb Using a 56 6 Kbps modem 9 hours 6 mins 512 Kbps 48 mins Using a 128 Kbps ISDN 3 hours 12 mins 1 Mbps 24 mins 4 Rutland 60 Mb Using a 56 6 Kbps modem 3 hours 512 Kbps 16 mins Using a 128 Kbps ISDN 1 hour 1 Mbps 8 mins a AE OS MasterMap user guide product specification chapter 1 9 v5 1 2 2004 Crown copyright Page 122
133. ive they are held in memory by your web browser and hold no data other than a unique identifier to identify your browser s session rather than any other browser s session The security risks attached to client side cookies do not apply to session cookies and therefore there is no reason to have them disabled Web based applications are based on the HTTP This is a stateless protocol which means there is no inherent way to track one request from the next made by a particular web browser We need to record the progress made by the browser in building up a new estimate or making a new order The session cookie is a unique identifier that the browser will send with each individual request this effectively enables us to identify requests being made by the same browser and therefore hold the state of their estimate or order All state is held on our web servers nothing is held on the browser s PC We do need the browser to support per session cookies and to have them enabled for this mechanism to work All browsers that the service is compatible with do support session cookies and all of them have session cookies enabled by default For more information on browsers see Minimum system requirements for the data selector earlier in this chapter en AAA OS MasterMap user guide product specification chapter 1 9 v5 1 2 2004 Crown copyright Page 129 Security of information provided to the data selector and security of purchasing online Secu
134. kInformation features An example could be an access restriction such as pedestrianised area that may be used by vehicles at specific times and only applies to a few hundred metres of a RoadLink feature The start and finish points along the RoadLink feature are supplied as both National Grid coordinates and the distance along the RoadLink feature from its start point RR a a a OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 79 Information about part of a RoadLink specific to a given direction of travel RRI features that apply to a specific direction of travel along to a portion of a single RoadLink are captured as PartialRoadRoutelnformation features An example could be an access restriction such as a bus lane in one direction only or a one way street that applies to a portion of a RoadLink feature The start and finish points along the RoadLink feature are supplied as both National Grid coordinates and the distance along the RoadLink feature from its start point Relationships between ITN Roads features Information Point from Road Network RoadNodeInformation from Road Routing Information FerryLink from Road Network FerryNode gt from Road Network Road from Road Network lin RoadLinkInformation from Road Routing Information ae RoadPartialLinkInformation
135. l accuracy Ordnance Survey has implemented a national programme to improve the absolute positional accuracy of its detailed mapping data of rural areas at 1 2500 scale Absolute positional accuracy is a measure that indicates how closely the coordinates of a point in Ordnance Survey map data agree with the true National Grid coordinates of the same point on the ground As a result of new technology such as GPS and digitally scanned aerial photography we can now collect mapping data at a greater accuracy and with more efficiency than in the past The national programme uses this wealth of new technology to improve positional accuracy of our 1 2500 scale mapping We believe that it is vital to tackle this now to ensure our 1 2500 scale rural areas map data meets modern quality standards and to ensure that the accuracy level will be suitable and acceptable in the future for our customers Features that have had their absoluteaccuracy of position improved are issued as part of the change only update data as they have had a change in version number and date They can normally be identified by feature level inspection of the changeHistory attributes with the specific value in the GML of reasonForChange value Position For more information on our positional accuracy programme see our web site http www ordnancesurvey co uk positional RRR a OS MasterMap user guide product specification chapter 1 11 v5 1 2 2004 Crown copyrigh
136. l chunk is a complete grid square the others are partly bounded by the data selection polygon The upper left square shows the effect when the data selection polygon crosses a grid square twice two or more separate chunks are created see Counters in chapter 1 10 OS MasterMap user guide product specification chapter 1 9 v5 1 2 2004 Crown copyright Page 125 Chunk size is particularly important when ordering the OS MasterMap Topography Layer When selecting chunk size it is advisable to consider the spatial density of features in the contract area The higher the density of features on the ground the bigger the GML chunk files will be For example a customer in central London may wish to order data for the City of London in 2 km by 2 km chunks because London is densely populated with geographic features Conversely a customer in the North of Scotland may select a 10 km by 10 km chunk supply because the spatial density of features is relatively low Some systems have had trouble handling chunks with large file sizes this has caused some systems to hang as a result Systems suppliers are able to advise the best chunk rates for their systems In a GML data chunk features are not clipped to the nominal supply boundary see above What is supplied unclipped data Therefore each chunk includes all current features that overlap the nominal chunk boundary In topological polygon data line features that are outside the nominal boundary
137. l way Both full supply and updates whether change only or full resupply are chunked OS MasterMap data is seamless so GML files containing vast areas could be very large In order to provide files of a manageable size data supplies are divided into chunks of a user specified size each of which is supplied in a separate GML file data selection polygon We recommend that national cover say customers take 10 km by 10 km chunks although 5 km by 5 km chunks are provided by default For any other sized order the a Ds customer can select from a choice of 2 km by 2 km 5 km by 5 km or 10 km by 10 km chunks Note that national cover cannot be provided in 2 km by 2 km chunks Chunks are defined by overlaying a floating square grid on the data 4 5km selection polygon such that the grid is optimally aligned with the The Imagery Layer will only be supplied as 1 km by 1 km chunks The part of the data supply area that falls in each chunk is supplied in a separate GML file Where a chunk lies entirely within the data selection polygon the GML file covers the entire square Where the data selection polygon intersects the chunk one or more GML files E ES are created bounded partly by the grid square edges and partly by the data selection polygon The diagram here illustrates this The division of a data supply polygon large grey region into chunks by overlaying a 5 km chunking grid In this case ten chunks are created The centra
138. ly by the following three processes e continuous revision by our network of field offices around the country e centralised activity driven by external intelligence sources and e cyclic revision by photogrammetric surveys There have been some changes to surveying practices due to OS MasterMap requirements such as in the way we update features when real world objects change to correctly manage feature life cycles see Chapter 1 8 Life cycles of OS MasterMap features The OS MasterMap Imagery Layer has been created using imagery from internal and external sources OS MasterMap user guide product specification chapter 1 2 v5 1 2 2004 Crown copyright Page 22 What s new in version 5 Improvement to the Land Line tile importer The upper limit for the Land Line tile importer has now been increased from 3 000 to 240 000 which is greater than the total number of Land Line tiles currently available Very large tile lists can be downloaded providing that the number of individual polygons created does not exceed 3000 Change only update scheduling Customers will now be able to specify a regular date for the receipt of change only update See Chapter 9 Pre defined and user defined areas The pre defined area tree structure has been rearranged to make selection more intuitive Pre defined areas now follow a more logical sequence based on a hierarchical geographical location for example counties with their districts and unitary auth
139. mailed to you when your account was set up Your contract details can be accessed at any time and you will have the ability to order changed features with respect to a user specified date usually the date of last supply See Change only update service in chapter 1 9 All GML files are compressed using the UNIX gzip standard The compression ratio achieved is approximately 20 1 The OS MasterMap data selector is easy to use Once you have accessed the service just select from the options on screen and use the buttons on the left of the screen to navigate and confirm your selections The online help facility gives more information on each part of the system and we recommend that you read the OS MasterMap overview in the general information module Minimum system requirements for the data selector The minimum system requirements for use of the OS MasterMap data selector are e Pentium 2 processor 350 MHz more complex user Netscape 7 0 or Internet Explorer version 5 5 6 0 or defined areas would require a higher specification above browser processor e Screen resolution of 800 x 600 e 15 inch monitor e 16000 colours e 56 6 Kbps modem or preferably Broadband ISDN or a T1 connection The preferred browser is Internet Explorer version 5 5 6 0 or above Your browser must also be Java enabled see the Ordnance Survey web site for further information For data collection from the FTP server your FTP client will need to be act
140. maps of Great Britain at all scales It provides an unambiguous spatial reference for any place or entity in Great Britain OS MasterMap user guide product specification appendix A v5 1 2 2004 Crown copyright Page 182 object based data Data in which one entity that is one feature represents one real world object for example a building or land parcel off line supply The supply of data to a customer on physical media for example CD DVD online supply The supply of data to a customer using Internet technologies order A request from a customer for the supply of data The scope of an order may be constrained by an agreement for a period licence service orthorectified imagery The Imagery Layer is orthorectified An orthoimage is achieved through a rigorous mathematical modelling of the camera position direction and the terrain surface at the moment of image exposure A software process is then able to move each of the pixels in the image individually into its correct National Grid position The process eliminates displacements due to image perspective and pointing direction the aircraft is moving and rolls around all axes and topographic relief and therefore results in an image having the same geometric properties as a map projection pay as you go See pay as you use service Pay as you use service A service provided by Licensed Partners giving access to Ordnance Survey data for business use on a transaction basis as
141. mationPoint feature will be retained with a new version FerryLink and FerryNode FerryLink and FerryNode features have a simple relationship to the real world in that they represent either ferry route or the start end of a ferry route In general they are simply created or deleted 1 If a FerryLink feature or FerryNode feature previously deleted is subsequently reinstated it would be captured as a new feature a EA OS MasterMap user guide product specification chapter 1 8 v5 1 2 2004 Crown copyright Page 115 Changes in topology 1 A FerryNode feature that has a FerryTerminal feature or FerryLink feature linked to it will persist with an increased version 2 A FerryNode feature that has FerryTerminal feature or FerryLink feature removed from it will persist provided it is still required to represent the end of a one or more FerryLink features If the feature persists the version will increase FerryTerminal FerryTerminal features represent the interchange between networks They generally persist unless the interchange they represent no longer exists Topology Where a FerryTerminal feature has referenceToNetwork attributes changed to reflect additional or reduced references it will be retained and have its version increased Routing information RRI features have a complex relationship to the real world and ITN Roads features can only make a very limited attempt to model this relationship In general changes to road rout
142. me level of gravitational potential georectified imagery The georectification method is a very simple process that uses detail points visible in the image and on the map The image is then warped to fit the map on those points There is no information to ensure that the image fits the map elsewhere GML Geography Mark up Language An XML encoding for the transport and storage of geographic information including both the geometry and attributes of geographic features GPS Global Positioning System A satellite based navigational system allowing the determination of any point on the Earth s surface with a high degree of accuracy given a suitable GPS receiver OS MasterMap user guide product specification appendix A v5 1 2 2004 Crown copyright Page 180 history In the context of geospatial data the storage of deleted features and superseded versions of features independent polygon One of the options for OS MasterMap product feature geometry topology in which the data is simplified into area point and line features with no relationship between them and with their own explicit geometry For example in the independent polygon product the bounding line between two areas will be represented three times each with their own description of the geometry once as a line feature once as part of the bounding line of the first area feature and once as part of the bounding line of the second area feature This is distinct from the topologic
143. mprovement Resources are directed towards continually improving the acceptable quality levels for absolute accuracy with each update of the imagery OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 169 Radiometric accuracy Definition Radiometric accuracy is a measure of the colour balance luminosity and contrast of the image Measurables The mean histogram luminosity The mean of the individual bands The standard deviation for each band Conformity The mean histogram luminosity has a value between 100 and 128 10 90 to 141 Red band mean 110 15 94 to 126 SD gt 30 Green band mean 118 15 100 to 136 SD gt 28 Blue band mean 90 20 72 to 108 SD gt 23 Colour band must conform across the whole block that is supplied The specification values ensure consistent balanced imagery In areas where the specification could not be met in areas of homogeneous colour for example woodland the shadow areas show detail and generally have greyscale values of 30 or less and highlight areas show detail and generally have greyscale values over 225 The colour balance will be consistent with the surrounding area Correction No correction that requires either the return of imagery to the supplier for reprocessing or the capture of new imagery specifically to correct an error will take place unless Ordnance Survey believes that failure to do so would hav
144. n Explicit and implicit drive restrictions Explicit drive restrictions are those normally displayed on road signs or painted on the roadway such as Turn Right Ahead Only No Left Turn and so on Implicit drive restrictions are turns or changes of direction that are possible but undesirable or dangerous because of the position of traffic islands road markings or lane indicators Both types of restriction are captured Representation of information captured feature types RRI features are captured as one of five types dependant upon whether they apply coincident with an intersection of network lines that affect a RoadLink regardless of direction of travel along a RoadLink or link s in a specific direction along part of a RoadLink or along part of a RoadLink in a specified direction Information coincident with RoadNode features RRI features that occur coincident with intersections of the base network are captured as RoadNodelnformation features Typical examples would be mini roundabouts or bridges with a height restriction where one road crosses another Height restrictions not coincident with RoadNode features are captured as described in the following section RR a OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 78 Information about a RoadLink where direction of travel is unimportant RRI features that apply regardless of direction of travel to an entire Ro
145. n Real world objects may also be aggregated in OS MasterMap For example a small group of trees may be recorded as a single feature Topography Layer definitions Distinctive text Distinctive text is defined within the Topography Layer as a name given to a feature or place to distinguish it from other features or places of a similar nature for example River Avon Hill Lane Surgery Leeds or New Forest Descriptive text Descriptive text is defined within the Topography Layer as a generic name given to a feature where a distinctive name does not apply for example drain boundary post or car park Where the function or purpose of some features are not clear it is possible that they will be described with both a distinctive and descriptive name for example Sandy Lane Track or Old Thatched House PH RR a OS MasterMap user guide product specification chapter 1 4 v5 1 2 2004 Crown copyright Page 32 Permanent detail Permanent detail is defined as physical features that it is reasonable to assume will remain in position for at least 10 years taking into account the nature of construction or character Natural relief features such as hills are not normally shown although they may be named Detail that is too small to be shown at scale but is sufficiently important or prominent is shown by a symbol All administrative boundaries are shown Indefinite detail Indefinite detail is defined as those physical features that
146. n a environmentQualifier instruction Access Limited To vehicleQualifier type exceptFor False Permit Holders Note the vehicleQualifier for the Access Limited To has the exception set to false to indicate it applies to Permit Holders as a vehicle use only In this example all other vehicles are not subject to the restriction therefore it is inferred that there is no access to any vehicles other than those specified permit holders OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 100 Chapter 1 8 Life cycles of OS MasterMap features Introduction Purpose This chapter sets out the rules that define the life cycles of topographic Address and ITN Roads features in OS MasterMap Essentially these rules indicate when an OS MasterMap feature should be retained and when it should be replaced for different types of features and different change scenarios This is derived from a larger document which details the requirements of Ordnance Survey editing systems and working practices of Ordnance Survey data collectors to implement OS MasterMap feature life cycles Because ITN Roads features are significantly different from topographic and to a lesser extent Address features their life cycles are described separately Feature life cycles Real world objects have life cycles For example a building is constructed it may be extended and is eventually demolished OS Master
147. n nano nn rn nan nr arca n E a NE rr nan nn ENEAN 111 Address Teatuire litecycle US iii A cias 112 Creation ot AddressPolNt feature caia reirte ciad 12 Deletion ot AddressPomtlieatUreS ci ed a di 112 Modification of AddressPoint features due to real world Change ooccccnoccccnnocccconannanonanonnnnno no nonnnn nara non nr nana n rn nano nn nr naar rn cnn a rn cnnnnnr 12 Modification of AddressPoint features due to error COrrection oooooncccnnnncccnncacnccnonnnanonononnnnnn ron ono n nara nn r naar rc r narran rra rca 112 ITN Roads feature life cycle rules oo eee ceeeeceeeeceeeeceeeeeeeeeeeeeeeeeeeeeeeeceeeceeeceeseeecceeseeeecceeseeecneeeeieeecieeseeeeiieeseeesieesieesieeenrenes 13 Creation O IN Roads US curs ltd t n 113 Deletion of MN Roads Teatinos A EEES TEE BeA aai eoii 113 Modification of ITN Roads features due to real world Change ooooocccnnocccinoncncconnnnnnononcnnnnn nn co nnnn non ono nn cnn nn rc nano nn nc rain nr crnnn ra cannnnr 113 Modification of ITN Roads features due to error COmeGtiON rsisi iseina dietai aaa Naai a paaie 113 Examples of the life cycle rules as applied to ITN Roads features o ooconocccinccconccconcconnncnancconnn nono nao no nnn nc nan nn nnnn cn nana nannrannncnnnncns 14 Road TEATS somsrisnasidat add ains 114 A A E E Slental Vena Ma aneats Gh aban cea Guetbdaaneade 114 RoadNo dera opa 115 Norman Pocas ici 115 A INO GS asesmen aee aee E e e aE aE ia E ana leordi dadea EED a Tei ed eA oE Daa
148. ncept of geographically splitting the data for management purposes All features are complete and there is no underlying tile structure SLA Service level agreement spatial reference system The term used in GML and hence in OS MasterMap specifications for the definition that allows spatial positions to be stated as coordinate tuples The only spatial reference system currently used in OS MasterMap is the British National Grid supply format The file format in which the data is supplied to the customer surface make See make RR REA OS MasterMap user guide product specification appendix A v5 1 2 2004 Crown copyright Page 185 terminal multiplier A pricing multiplier that reflects the number of terminals or workstations that have access to Ordnance Survey data whether simultaneous or not theme A collection of features that form some logical set for example buildings water land In the OS MasterMap context themes are a collection of features that are either similar in nature or are related to specific usage A single feature may be in one or more themes They are designed to allow the easy selection of features They do not form part of the classification of the feature The theme exists purely to facilitate customer data selection tile A self contained rectangular subset of digital data used to subdivide that data into manageable units OS MasterMap data has no tiles TOID A number that uniquely identifies e
149. nd TOID are registered trademarks and Digital National Framework ITN Integrated Transport Network Ordnance Survey Options and OSTNO2 are trademarks of Ordnance Survey the national mapping agency of Great Britain Acrobat Reader and Adobe are registered trademarks of Adobe Systems Incorporated ArcView and ESRI are registered trademarks of Environmental Systems Research Institute Inc DXF is a trademark of Autodesk Inc Java is a registered trademark of Sun Microsystems Inc Maplnfo is a registered trademark of MapInfo Corporation Netscape is a registered trademark of Netscape Communications Corporation PAF and Royal Mail are registered trademarks of the Royal Mail Group plc Pentium is a registered trademark of Intel Corporation UNIX is a registered trademark of X Open Company Ltd Ordnance Survey acknowledges all other trademarks OS MasterMap user guide product specification preface v5 1 2 2004 Crown copyright Page 3 Contents Chapter 1 1 Chapter 1 2 Chapter 1 3 Chapter 1 4 INTO siria coa A ais 12 USING the user Dll a A id ii 12 General d Scnption Or OS Master cn beamebtaaunchqes N E EE Ea E a EEN 13 System Tegurem eMis ola aires 14 SUPPI iiot A a AAA Ada 15 OVERVIEW Cf OS MasterD ida ad 16 Data OVE IVI Wind A Rutan a etc OE RE 16 AA Clea cccceed lie cere lea cobeic re Coc a Cteesauaviedas tee a a r E E 19 A A txstectetsencetuabeastua seicidgessan edsechasiets 19 Feature VERSION AUMDE ES a a t
150. ng the data on Users will have access to an Imagery Layer coverage map of the UK to check the availability of their proposed purchase They will also be able to view subsampled two metre resolution imagery within the chosen area When ordering data additional information is requested e The data format There are two options for the Topography Layer GML topological polygon data and GML independent polygon data The Imagery Layer is available in TIFF JPEG MrSID and ECW e Full supply or change only data for non imagery layers If you select the latter you will need to give a change since date the date from which you wish to take any changed data e For imagery you opt to receive all available data or that since a particular year No imagery is more than 5 years old e The chunk size for non imagery layers Chunking of imagery is restricted to 1 km x 1 km See Chunking supply of data in chapter 1 9 e The delivery mechanism OS MasterMap data can be supplied via FTP server e Data supplied via the FTP server is limited to a size of 400 Mb any order estimated at less than this volume but subsequently found to be more will be supplied on your chosen alternative media e If you are taking data from our FTP server you will be advised by email when your data is ready for collection The email will contain a URL address to access the server and instructions on how to download your data e Readme files will be included with each order
151. not supplied that is if a chunk contains no information relating to your selected themes then it would be an empty file so is not supplied Chunks cannot be treated as persistent data management units as it is a floating grid the origin of the chunking grid may differ between orders a AE OS MasterMap user guide product specification chapter 1 9 v5 1 2 2004 Crown copyright Page 126 Change only update service Once you have taken data from your agreed geographical contract area you may request change only update from a specified date the change since date This is not applicable to the OS MasterMap Imagery Layer Update can be provided either in response to a user request or triggered at a regular supply interval automatic change only update service The automatic change only update service allows the customer to request change only update at regular intervals for new orders or new orders based on an existing order We recommend that you avoid scheduling supply on the first and last days of the month as these are popular choices and may mean that your order takes slightly longer to process When using automatic change only update the data you receive will represent changes between the next scheduled change only update request you have given and the creation date of the last scheduled COU oder if one exists The last date can also represent the initial order on which the first schedule is based Customers will either receive the d
152. nt the larger part and a new feature is created to represent the smaller part 6 Most of the large garden of a residential property is sold off for development The garden feature is retained to represent the much reduced garden Joining of area features When two or more real world area objects are merged by the removal of physical boundaries it may be that one of the original real world objects is clearly recognisable as subsuming the other s If that is the case the feature representing the dominant real world object is retained and the other feature s deleted If one of the original real world objects is not clearly dominant the following considerations are used as a guideline to determine whether a feature is retained e Is the function of the resultant real world object the same as one of the originals e Can one of the original real world objects be considered the obvious predecessor to the resultant real world object e Is the area of the resultant real world object less than twice that of one of the original real world objects If the continuation of the feature cannot be justified on one or more of these grounds all the original features are deleted and replaced with new features Examples 1 Two fields one of which is larger than the other are merged into one such that the resultant real world object is recognisable as the larger field subsuming the smaller field The feature representing the larger field is retained The sm
153. o order your initial data supply and update change only or full resupply obtain price estimates and view details of your holdings e OS MasterMap except Imagery Layer is supplied in GML Geography Mark up Language version 2 1 2 see Reference section OS MasterMap user guide Imagery Layer formats are TIFF JPEG ECW or MrSID with the Imagery Layer metadata in XML e Both initial supply and updates are available on CD DVD and via the FTP server although the FTP server is limited to an order volume of 400 Mb For initial supply we recommend that customers select CD or DVD single side 4 6 Gb due to the larger volumes of data involved e This data is designed to be kept up to date via an online change only update see Change only update service in chapter 1 9 Users may request updates of the latest changes in their area of interest at any time using our online change information service e You can assign a regular date for receipt of change only updates These will then be sent automatically on the required media or an email sent out to inform you that the data is ready to be collected from the FTP server See Chapter 1 9 e You can specify the area of interest to be updated by defining your own data selection polygon around the features required by selecting pre defined areas by importing tile lists or your own polygons restrictions apply See Chapter 1 9 e To make the management of large areas easier data is split into chunks ea
154. ocesses and review the OS MasterMap ITN Roads RoadLink and RoadNode features periodically to meet customers requirements RRR OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 155 Geometric fidelity Definition The relationship between ITN Roads RoadLink and RoadNode features and their associated features in the Topography Layer Measurables Whether ITN RoadLink and RoadNode features are positioned within the defined or inferred limits of their associated features in the Topography Layer Conformity At least 99 of ITN Roads RoadLink features will correctly represent the general geometric alignment of the road and lie within the corresponding OS MasterMap topographic feature representing the road The exception to this where there is a delay in updating the Topography Layer In this case ITN Roads features may not be in geometric sympathy with the Topography Layer At least 99 of nodes should only exist at road junctions breaks for name change or culs de sac A total of 100 of ITN Roads RoadLink features will remain unbroken where they pass through tunnels or under bridges viaducts buildings footbridges and gantries RRR a OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 156 Example 1 Road under railway bridge The RoadLink features represented here as thick white lines are broken at the road junction but not
155. of the Ordnance Survey web site Once the account is live you will be issued with an account number user name of your choice and password You can then access the OS MasterMap data selector to create estimates Estimates can be converted to contracts online Once a contract is in place orders for OS MasterMap data can be placed based on that contract Customer support is available from 08 30 to 17 30 hours weekdays excluding Bank Holidays Your first task is to create an estimate using the estimates module of the data selector The main parameters chosen by the user when creating an estimate are e The area required specified as a polygon selected by using one of the following options 1 User defined polygon defined by the user on maps of various scales using a variety of tools 2 Pre defined polygon currently local authority administrative areas Government Office Regions postcode areas and the area within the M25 a AE OS MasterMap user guide product specification chapter 1 9 v5 1 2 2004 Crown copyright Page 117 Note regarding pre defined polygons formed by using administrative boundaries Pre defined polygons are formed using boundary information which may change over time Local authority administrative boundaries are based on our Boundary Line product which is regularly updated to reflect the changes which occur to administrative boundaries over time 3 Importing Land Line tile references 4 Importing your own polygons
156. ometry and topology specification OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 149 Conformity All logical consistency components are fully checked by software but there are some inconsistencies Therefore provisional values for the national dataset are e Conceptual the life cycle of a feature is a subjective measure relying on the interpretation of those updating the data Ordnance Survey is testing revision activity and will publish metrics when they become available e Value domains 100 will meet the specification e Physical structure 100 will be valid as per the specification e Topological 100 will be valid as per the specification Improvement Improved editing software will be introduced to enhance the conformity of conceptual logical consistency Thematic attribute accuracy Definition How accurately the attributes within OS MasterMap record the information about a real world object Measurable The three components of attribute accuracy that can be measured e Feature descriptive groups and descriptive terms correctly representing attributes of the real world objects e Change through time attributes correctly reflecting the reasons for change for OS MasterMap features e CartographicText correctly represents the real world object that it refers to via an OS MasterMap feature RRR a OS MasterMap user guide product specification chapter 1 12 v5 1 2
157. ompany that offers individuals or enterprises access over the Internet to application programmes provider for example GIS and related services that would otherwise have to be located in their own personal or enterprise computers This may also include access to relevant related data area feature A polygonised representation of a real world object Each area bounded by a continuous closed chain of line features is an area feature The geometry of an area feature consists of an external boundary and optionally one or more inner boundaries holes in the area feature Each boundary is represented by a polygon An area feature may be used to represent a building field lake administrative area and so on area of interest The spatial extent that a customer has access to for a specific product This area of interest may include a number of different spatial extents The area of interest is an integral part of a contract RRR a OS MasterMap user guide product specification appendix A v5 1 2 2004 Crown copyright Page 176 area of order The spatial extent of data requested by a customer as part of an order It may comprise a number of different spatial extents but all of them will fall completely within the customer s area of interest associated data Datasets held by third parties that have been linked to features within OS MasterMap by means of identifiers TOIDs attribute Any item of information packaged in an OS MasterMap
158. only updates and can order updates or re supplies at any time When you order change only update you specify a change since date and all features that have changed since 00 00 hours on the date you specify are supplied This will usually be the date of your last data supply but could be a previous date It is not possible to obtain the exact change only update since your last data supply If you request change from the date of your last data supply and there are changes between 00 00 hours on that day and the time of your last supply some features supplied as change will already exist in your data holding Therefore your system must check the TOID and version of every feature in the update against your current data holding to determine whether it should be loaded and if so what existing feature s it replaces This makes it possible to request and load change only update with a date preceding your last data supply date without damaging your data holding This feature can be used to correct your data holding if inconsistencies have occurred due to partially loaded or non sequential change only updates by ordering a single change only update with a change since date that precedes the problem updates OS MasterMap user guide product specification chapter 1 10 v5 1 2 2004 Crown copyright Page 131 Change only information is available using the OS MasterMap online ordering and delivery service You can interrogate this service by entering th
159. or District Area Address attributes addressStatus The importance of checking this attribute to establish address quality cannot be overemphasised The known quality of the data is indicated by a combination of the contained attributes structureType positionalQuality physicalStatus and matchStatus OS MasterMap user guide product specification chapter 1 5 v5 1 2 2004 Crown copyright Page 59 structureType This is a simple structural classification of the topographic area referred to by this address point It indicates that the topographic polygon referred to is a Permanent Building Other Structure or of Unknown construction positionalQuality This indicates whether an address location is in its Final or Provisional position Final means that the address is located either inside the building that defines the addressed premises or in a position that cannot be improved because of the nature of the addressed structure for example a house boat Provisional means the address may be a considerable distance from the addressed structure usually less than 50 m but may exceed 100 m physicalStatus This indicates the real world status of the structure to which the delivery point is linked It will be Planned Existing Demolished or Unknown matchStatus This indicates the quality of the matching between Ordnance Survey and PAF addresses as either Matched Unmatched Matched With Discrepancy Unresolved or Matched With Discrepancy
160. orities rather than being arranged alphabetically Metropolitan Counties are also included as a new choice for selection The following features will also be included to aid selection of customer data e User defined polygons to be rescalable without the need to redraw the whole area e The ability to specify a buffer around pre defined areas to a maximum of 10 000 metres e The inclusion of a transparency slider bar to allow customers to be able to fade between available imagery and backdrop mapping RR a a OS MasterMap user guide product specification chapter 1 2 v5 1 2 2004 Crown copyright Page 23 Chapter 1 3 OS MasterMap themes Principles of OS MasterMap themes What is a theme A theme is a fixed set of features that can be collectively selected for supply by users A feature can be a member of any number of themes All features supplied in the product belong to at least one theme A theme is created by applying rules based on the attributes of OS MasterMap features For instance the rule for membership of the water theme is that the descriptiveGroup attribute of the feature must be one of tidal water or inland water A theme rule can put conditions on more than one feature attribute A feature is a member of every theme for which it passes the theme rules Themes are not part of the classification system of OS MasterMap features A new theme can be created for the convenience of users without in any way affecting either t
161. ork features positioned on the National Grid and an Imagery Layer Every OS MasterMap feature has a unique identifier called a TOID which is used to refer to the feature Key elements are e Seamless data no tiles e Imagery providing a reliable and consistent source of orthorectified aerial photography for Great Britain e TopographicArea features the building blocks of our data many of which represent individual real world objects e Address features the Royal Mail Postcode Address File PAF georeferenced and cross referenced to a building where appropriate e Topological road network features a structured network representing the road system and relevant information related to it For all layers except the Imagery Layer the following key elements apply e feature life cycles all OS MasterMap features have defined life cycles linked to real world object life cycles e unique identifier TOID for each OS MasterMap feature e availability of data by themes and e anew system of feature classification feature attributes The process of creating OS MasterMap involved the re engineering of our National Topographic Database from which our large scale products are derived The new database is object oriented and stores data in a seamless form This means we can supply any set of OS MasterMap features by area or theme nat just fixed tiles of data as in previous generations of Ordnance Survey products RR
162. ork is broken only in specific circumstances and a RoadNode feature is added coincident with the end of all RoadLink features The end of a RoadLink feature indicates one of the following situations e the intersection or crossing of carriageways including bridges flyovers tunnels where there is no connectivity e the location where a road name or number changes e the location where a road name or number ceases to apply or e the start end of a carriageway A RoadNode feature has a point geometry and a reference to the underlying topographic polygon OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 75 Road junctions Not populated in current release Will be available from summer 2004 Motorway junctions only are currently represented as a single point feature described as an InformationPoint feature InformationPoint features include a representative location for the junction and textual details of the junction number and the roads that intersect at the junction No other junctions are currently captured as discrete features and it is likely that an improved modelling of junctions may be introduced in a future release Vehicular ferry routes Not populated in current release Will be available from summer 2004 Vehicular ferry routes are indicated by a combination of features in the same way as the road network FerryLink The existence of a vehicular ferry service is represented
163. ough ground points should when viewed at actual pixel resolution 1 1 scale pass through the plan positions of the corresponding points in the Imagery Layer e Adjacent features are in sympathy with each other as regards alignment and orientation Conformity Acceptable geometric fidelity quality is defined as when the Imagery Layer is viewed at actual pixel resolution 1 1 scale it closely reflects the real world object s geometry Ordnance Survey continually monitors the imagery to ensure compliance with the acceptable quality levels for geometric fidelity RRR a OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 164 Correction No correction that requires either the return of imagery to the supplier for reprocessing or the capture of new imagery specifically to correct an error will take place unless Ordnance Survey believes that failure to do so would have serious consequences for customers ability to use the data Improvement Resources are directed towards continually improving each update of the imagery to improve the acceptable quality levels for geometric fidelity Image appearance Definition Overall appearance and quality of the imagery The imagery must be pleasing to the eye and have minimal artefacts Measurables e Artefacts scratches hairs dust flies or similar e Clipping clipping at the extremes of the histogram e Cloud cover cloud shadow e
164. ources are directed towards continually improving the mosaicking process with each update of the Imagery Existing imagery The following quality statements are specific to imagery created prior to 1 January 2003 Absolute accuracy Definition Absolute accuracy is a measure that indicates how closely the coordinates of a point in the Imagery Layer agree with the true coordinates of the same point on the ground in Ordnance Survey National Grid Measurables The comparison between the position recorded in the Imagery Layer and the true position of the feature on the ground RRR a OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 167 Conformity Data capture standards RMSE Urban and rural areas 2 5m Mountain and moorland areas 40m Root mean square error Correction No correction that requires either the return of imagery to the supplier for reprocessing or the capture of new imagery specifically to correct an error will take place unless Ordnance Survey believes that failure to do so would have serious consequences for customers ability to use the data Improvement Resources are directed towards continually improving the acceptable quality levels for absolute accuracy with each update of the Imagery New imagery The following quality statements are specific to imagery created after 1 January 2003 Absolute accuracy Definition Absolute accuracy is a measure that indi
165. owest AT Ti inveresk fi level of surveyable detail that can be a L LUUL ands Y surveyed in relation to other detail but TIT NA ands N is not underground Q z 13 ee i a i W Those features that are less than 0 3 m 3 E di g dE a ena high in height are given different coding to 4 1819 C 3 2 J g g distinguish them from those above AA LA lA 26 t 3 0 3m These are usually features that E a 2 a do not pose an obstacle to pedestrians z 3 y such as kerbs See figure 1 9 2 E a _ et Figure 1 9 2 Example of ground MIDDLE LANE surface level features po AAA Pis ji il P Features more than 0 3m high _ for example fences or hedges Overhead level Features that exist above the ground surface level are defined as overhead detail Examples of overhead features include electricity transmission lines ropeways gantries ski lifts and some pipelines This does not include bridges which are classified as ground surface level Overhead features such as pipes within an industrial installation are not shown where they form an integral part of that installation Depiction of overhead features entering such installations is terminated at the first support or building within the perimeter O gt OS MasterMap user guide product specification chapter 1 4 v5 1 2 2004 O Crown copyright Page 34 Underground level Detail that has requir
166. ply to all OS MasterMap layers unless they are specifically identified under each OS MasterMap layer heading below Each component is described by the following parameters Definition the description of the particular quality parameter Measurables the set of one or more measures against which the parameter is assessed Conformity the limiting value for each measure that any metric is not expected to exceed Correction the protocol for correcting nonconformance Improvement the protocol for improving data that is within the limiting values OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 140 Completeness Definition Completeness is a measure of the correspondence between the real world and the specified data content for OS MasterMap as reflected in the OS MasterMap real world object catalogue Temporal validity commonly known as currency is described as the capture of change and is considered later in this chapter Measurables Omission e Features representing a real world object s that conform to the OS MasterMap real world object catalogue are not contained in the data Comission e Features representing departed real world objects remaining within the data e Features are captured that do not conform to the OS MasterMap real world object catalogue Conformity Ordnance Survey continually monitors the data to ensure that only features representing re
167. rMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 87 In this example there is a No Entry restriction into Kent Road between the hours of 8 am and 8 pm Kent Road is not a one way street RoadRoutelnformation attributes dateTimeQualifier specifiedTime startTime 08 00 endTime 20 00 environmentQualifier Instruction No Entry vehicleQualifier n a The RoadRoutelnformation feature is directed indicating the end of the link the No Entry applies to OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 88 Turn restrictions and mandatory turns Turn information consists of mandatory turns or restricted turns These are added when required because their effect is not supplied by traffic flow restrictions for example one way streets or access restrictions such as no entries In this example there is a no right turn into Oak Lane A and traffic coming from Elm Lane must turn left into Lily Avenue B RoadRoutelnformation attributes for feature A dateTimeQualifier n a environmentQualifier Instruction No Turn vehicleQualifier n a RoadRoutelnformation attributes for feature B dateTimeQualifier n a environmentQualifier Instruction Mandatory Turn vehicleQualifier n a The RoadLink features referred to are ordered and directed indicating the direction of the restriction OS MasterMap user guide produ
168. raints imposed by survey tolerances The bench mark symbol is usually oriented at 90 to the face of the object on which the mark is placed It may be pivoted through up to 30 to avoid obscuring nearby detail Water Continuous topographical water features that extend into private gardens are shown Linear water features such as streams and rivers and so on are normally shown to scale If however the width of such features is less than a certain size then they are shown as a single line Ordnance Survey shows high and low water marks of a mean average tide that is an average tide halfway between spring and neap tides in England and Wales and of average spring tides in Scotland In tidal rivers the point to which mean tides or spring tides in Scotland flow at high or low water is included Lakes and ponds are surveyed at normal winter level reservoirs are shown at top water level that is spill over level All water features are described The highest point in a river to which normal tides flow is described as normal tidal limit NTL RRR a OS MasterMap user guide product specification chapter 1 4 v5 1 2 2004 Crown copyright Page 48 Figure 1 4 4 Example of real world objects in the water theme shown in blue and black SO i o OS MasterMap user guide product specification chapter 1 4 v5 1 2 2004 Crown copyright Page 49 Physical water features shown are mean high water springs and mean low w
169. re level id A eE naci 33 Canographic Sumace reli acia 33 Ground Surface level ita esa 34 A A NO 34 Underground leve P E liar da 35 A A o enree A reenter ere ne err erere cer E rr erereee ne rere cree 35 Parallel US aiii a eiii aia 35 Topography Layer theme Synne era a ti 35 Administrative boundaries 20 0 2 eeecccsnee cece eteeen eee ee ee eeeeeeaee eee eeteeeaaeeeeeeeceseaaeeeeeeeceeeaaaaeeeeeceeaaaaaeeeeeeesaaaaeeeesessqeaaaeeeeeesseqnaeeeteeees 36 BUIN Sm manantial it ti Ed aca 40 Herntages and AQUI iii A Ad Dti e 41 E aE E E E E E E E E E A A TA A E E A E fede saapenutenteess 42 Rallies 42 Roads PACKS AMO GUMS esineen e erea diesel coral states liado tienda dll aaeeea a ee aE 44 A ON 46 T ra and heigh tsss E als behets die dy Ea E EN bane pals Aaa S Aae ead pic nev akdide shea aae araa Naa 47 Wal redada 48 Chapter 1 5 Address Vai a oda ice clad tase dae tanec awa en ga siemens OE 52 O O 52 POTS MUS SS enren O 53 BOS last id e O a E canal E di 53 SE MS Talli OMIM GIGS cia A AA A A A A ean ve ence canteen eae 54 O NN 54 Address COMPONEN Std A A bc 54 Authors ation OE Names since id bean eli ara adobo bi cia 55 PersonalMaMES era ri al ao leete Denia Dada A E NE EET 55 Data Protection ACE 1998 iia cria sua NE AE a E E EE 55 Representation of adaresses cti tn aa reo cdi tired 56 organisation NAME a A e E EAE nek wise shacaces dette dbaaid dead a a a astoa 56 Department NAME cese 56 POST OMICS DOK a a A A ae 56 Sub p ilding Name ano NUM
170. riginal feature may be retained if a portion of its geometry remains and one or more new features may be created to reflect the change If the classification attributes of a line change then it will usually be retained Modification of line features due to error correction When a line feature is changed solely to correct a surveying or cartographic error the feature is retained unless topological changes make this impossible a AE OS MasterMap user guide product specification chapter 1 8 v5 1 2 2004 Crown copyright Page 110 Point feature life cycle rules The life cycles of point features are simpler than those of lines or areas since they cannot change in size or split into multiple features Creation of point features When a new real world object represented as a point feature comes into being a new point feature is created to represent it If however the object is a replacement for a previous real world object in the same position the original feature is retained Deletion of point features When a real world object is no longer present in the real world the point feature is removed from the database A record is kept in the database to indicate that the feature with this TOID used to exist Modification of point features due to real world change By the nature of the real world objects represented as point features in OS MasterMap data it is unlikely that one will be modified without changing its identity Therefore
171. rity of your company information is treated seriously by Ordnance Survey Your organisation s details are held in the secure area of our site which requires a user name and password to access It is your organisation s responsibility to safeguard your OS MasterMap user name and password The purchase area of our site is secure this means that we utilise industry standard Secure Sockets Layer SSL technology to allow for the encryption of potentially sensitive information such as your name address and other critically sensitive information Information passed between your computer and our web site cannot be read in the clear in the event that someone else intercepts it You may have noticed that the SSL certification is not being displayed https in the address box and a padlock in the status window This is because we are using frames to aid navigation This page however is secure This can be verified by right clicking on this screen and viewing its properties How customer information is protected in the data selector When you place orders we offer the use of a secure server The SSL encrypts all information you input before it is sent to us Furthermore as required by the UK Data Protection Act of 1998 we follow strict security procedures in the storage and disclosure of information that you have given us to prevent unauthorised access Our security procedures mean that we will routinely require proof of identity before we are able to di
172. roducts landline tileselector html Units of change Examples of the value of units of change for measuring temporal validity currency Feature description Value A new house and associated features including boundary features name number and 1 25 associated garages see note 1 New commercial industrial public sector and farm developments with buildings and 20 per hectare associated features captured at the time of the initial development Including boundary features car parks and private access roads Extension to an existing house 0 25 Extensions to existing commercial industrial public sector and farm buildings or 1 per 0 05 hectare developments see note 2 OS MasterMap user guide product specification appendix B v5 1 2 2004 Crown copyright Page 190 Feature description Value Property boundary features when part of a major refurbishment programme that 0 25 per feature line makes a significant impact on map data Significant alteration to an existing property boundary feature such as a fence or wall 0 25 per feature line New motorways and dual carriageways including associated boundary features 10 per 100 m vegetation slip roads and interchanges see note 3 New single carriage roads railways per pair of tracks and canals including 5 per 100 m associated paths fences and boundary features New kerb lines changes in existing kerb alignment and posts used to separate traffic 1 per 100m not assoc
173. rove currency and is investigating the use of pre build and developers plans to make information available at the earliest opportunity Logical consistency Definition The logical consistency of OS MasterMap is a measure of how well the data supplied matches the specification This covers the logic within the data and the syntax of the files supplied The data is checked for conformance to the specification laid down in this user guide We strive to ensure that there is no variation against the specification However the specification itself may allow for some variation in the way that particular features are represented The checks performed test how well the data conforms logically to the specifications not the content In some cases data may be logically correct in that it conforms to the specification but some elements may be of limited use the section on known data conformance issues within this chapter details identified examples Measurables There are four components of logical consistency that can be measured against the current OS MasterMap specifications e Conceptual the data maintenance rules in the overview and life cycle specifications e Value domains the values given in the attribute and classification specification e Physical structure of the stored and delivered datasets the database schema and GML formats e Topological the explicit topological references between features the values given in the ge
174. s Conformity OS MasterMap Imagery Layer includes land to Mean High Water in England and Wales and to Mean High Water Springs in Scotland As far as the source photo coverage allows foreshore and sea will be included in tiles which have some land cover The default colour for areas within Km tiles where there is no imagery coverage is black Correction No correction that requires either the return of imagery to the supplier for reprocessing or the capture of new imagery specifically to correct an error will take place unless Ordnance Survey believes that failure to do so would have serious consequences for customers ability to use the data OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 163 Improvement Ordnance Survey will continue to monitor the imagery collection processes and review OS MasterMap periodically to meet customers requirements Geometric fidelity Definition Geometric fidelity is the trueness of features in the Imagery Layer to the shapes and alignments of the real world objects they represent Normally geometric fidelity takes priority over relative and absolute accuracy Measurables The degree to which e Detail which is square on the ground is represented as square in the Imagery Layer and shapes must be accurate e Alignments which are straight in the real world are represented as straight lines within the Imagery Layer e Lines of sight which pass thr
175. s 20 E id id eiii Rii 20 Seamless dali oil 20 A A at eceucarainen a ox feagncateveer cqduatdeie fenoms da dcneseaactensestortaade 21 Address VOW CR lato shwvaat sscniageseaistveds du daped sausandeasttngegasudted a eia iad E e e an ATOE Taa 21 MN Roa dS Layer ces o aA AE a 21 ERE AAA PPP a a A A A Aa Aaa aaa aA ENa E aa E EAA aa RN 22 Data TONMal a E E T A e 22 SECAS a E aa a e a e ea E a 22 Whats NneWwillh Version Oscura did id add 23 lmprovement to the Land Line tiles Imperia li id od dia Ei 23 Change only update SCHECUIING cian cis 23 Pre delimed anda User delined AlCAS assesses di A ad 23 OS MasterMapeMesS nc iia RAI Adalid ooo 24 Principles 01 0S MasterMap Memes scort da ds A 24 Whatis 4 TONNE ic A A a ce 24 Themes ot line teatures that bound AREA Ea e apeiedeemaaseetntes 24 AE cl O panes niatenasscopandaaogedSuntensdssstenavants 25 ROBO Ost old d 27 OM Wars isena ere E E E E E EE E E E ia poes 27 Potential USES iii dd a AA aE A AN Ea oia a AAA aea E 28 GE METSIOMMGIDISS tm aa a a E E E AA E A E a A a S E E E A E aGaneeenaagens 32 Topography LayerdefintionS ssemma nia a ona E AE R aeia NaO EAA a DATE EDE a NEEE aa a Ea E 32 PSECU YG a EE S E E E E S 32 OS MasterMap user guide product specification contents v5 1 2 2004 Crown copyright Page 4 DDSSCHIPUVE TEXT siiaicscitaasidccebiacaneseddcdie TEA E Ea E cna A E O AAE EE E N E Sa 32 Permanent Qe tell coi a a a aE ee a EE NE Ii ar Se E AE ESE 33 Pame OO 33 Topographic featu
176. s a National Grid coordinate and a unique reference for each postal address in Great Britain this includes England Scotland and Wales but not the Isle of Man the Channel Islands or Northern Island The creation process for Address is the addition of Ordnance Survey National Grid references and metadata to Royal Mail s Postcode Address File PAF The PAF contains postal address data for approximately 26 million delivery points These delivery points may be premises that are shown in OS MasterMap data such as buildings or features that do not form part of the OS MasterMap specification such as temporary buildings and houseboats All valid addresses in PAF to which coordinates can be allocated will be in the Address Layer ITN Roads Layer OS MasterMap includes an ITN Roads Layer that currently contains Road Network and Road Routing Information themes Other themes are likely to be added in due course This layer consists of a fully topologically structured representation of the road network with the additional option of road routing information to enable route planning The road network is in geometric sympathy with the underlying topographic features and includes cross references between network components and TopographicArea features see Chapter 1 12 OS MasterMap quality statements for exceptions The Road Routing Information is only useable in conjunction with the roads network data so can only be estimated for and ordered together w
177. sclose sensitive information to you Password management guidance e Keep your user name and password secure within your organisation e lf your password is compromised then it must be changed immediately e You should not disclose your password to anyone even if they claim to be from Ordnance Survey or the police e Choose a password that has a mix of alpha numeric punctuation and or shift characters a AE OS MasterMap user guide product specification chapter 1 9 v5 1 2 2004 Crown copyright Page 130 Chapter 1 10 Data management guidelines This section provides some introductory comments on managing OS MasterMap data in your system and applications OS MasterMap data is ordered from the OS MasterMap data selector See Chapter 1 9 Guide to using the OS MasterMap data selector for more information on ordering data The way you manage your data will be dependent on the software you are using but there are some basic principles your system should follow Essential functionality of software that can manage OS MasterMap includes e translation or import of GML format data into storage formats e removal of duplicate features especially when loading chunked data see Chunking supply of data in chapter 1 9 and e applying change only update to your data holding see below Updating your data holdings The OS MasterMap database is live and undergoes continuous revision Period licence customers have unlimited access to change
178. such as cliffs and man made embankments and cuttings Figure 1 4 1 Example of Topography Layer data Also included within the Topography Layer are non physical features such as a selection of house numbers and where numbers have not been allocated names OS MasterMap user guide product specification chapter 1 4 v5 1 2 2004 Crown copyright Page 27 Potential uses NOTE In these examples OS MasterMap data has been used and manipulated with appropriate software that is not included as part of the product Example OS MasterMap being used to store information regarding site access Site Access Information National Grid Reference 376908 283901 Key required With owner Safety equipment No Last Inspection 11 03 03 From office A435 82076 A44 Views open All except 435 456 File reference TR 64 51 4 OS MasterMap user guide product specification chapter 1 4 v5 1 2 2004 Crown copyright Page 28 Example Asset management Do you need to record the precise location of pipelines cable lines valves hydrants or junction boxes OS MasterMap data may be displayed or plotted at a wide range of scales Individual features may be distinctively coloured symbolised or omitted Scenario A broken water main is causing flooding in an inner city area It is necessary to identify the precise position of water valves quickly OS MasterMap user guide product specification chapter 1 4 v5 1 2 20
179. t Page 137 Chapter 1 12 OS MasterMap quality statements Purpose This specification defines the quality standards that Ordnance Survey will apply to all OS MasterMap data supplied to customers The definition of quality in this document is a measure of performance against specification Specific metrics are included where they are available future ones will be added as they become available At the end of the chapter are details of known data conformance issues that may affect customers use of the data Scope and definitions Coverage In all cases the quality statements apply at a national level unless explicitly stated Within this dataset there is the possibility of local variances from the expected standards Acceptable quality level AQL The AQLs given in this document apply to the whole database Sample blocks of 5 km by 5 km will be used to measure the conformity of the data A total of 95 of sample blocks will meet the stated AQLs Confidence levels When measured as a percentage gives the amount of data that conforms to the measurable A confidence level of 95 means that Ordnance Survey believes 95 of data conforms to the published criteria OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 138 Real world object An object in the real world such as a building fence area of road or land Feature The item in the database that represents a real world object a
180. t be justified on one or more of these grounds the original feature is deleted and replaced with new features Examples 1 Anew housing development is completed within an agricultural field Part of the field remains and continues to be used for agriculture The feature representing the rump of the field is recognisable as the original and has the same function therefore it is retained New area features are created to represent the new development 2 An agricultural field is subdivided into three approximately equal parts that continue to be in similar usage Using the guidelines above none of the fields can be considered the obvious successor to the same as the original field all have an area less than half of the original therefore new features are created for all 3 A house is built within a field A new feature is created to represent the house The feature representing the field is retained 4 A house is divided equally in two by an externally surveyable division No other changes take place The original feature is deleted and new features created This is because neither of the resultant houses is the obvious successor to the original a A OS MasterMap user guide product specification chapter 1 8 v5 1 2 2004 Crown copyright Page 106 5 A large agricultural building is split into two by the addition of an externally surveyable division enclosing approximately 25 of the original area The original feature is retained to represe
181. t will be supplied A FerryNode feature outside the area of interest but referenced by a FerryLink feature intersecting the area of interest will not be supplied A FerryNode feature outside the area of interest but referenced by a supplied FerryTerminal will not be supplied A FerryTerminal feature that references a RoadNode or FerryNode feature within the area of interest will be supplied All RoadNodelnformation features related to a RoadNode feature that is within the area of interest will be supplied All RoadLinkInformation features related to a RoadLink feature that intersects with the area of interest will be supplied All RoadRoutelnformation features related to any RoadLink feature that intersects with the area of interest will be supplied All RoadPartialLinkInformation features related to a RoadLink feature that intersects with the area of interest will be supplied All RoadPartialRoutelnformation features related to a RoadLink feature that intersects with the area of interest will be supplied OS MasterMap user guide product specification chapter 1 9 v5 1 2 2004 Crown copyright Page 124 Imagery Layer Imagery will be supplied with the exact specified area excepting areas that did not have imagery coverage at the time the estimate was created Chunking supply of data Chunk boundaries are imposed purely for the purpose of dividing large supply areas into pieces of a manageable size in a geographically meaningfu
182. terMap feature within the ITN road network theme may be e aroad feature representing a named or numbered road e aRoadLink feature representing the general alignment of a section of road RoadLinks are broken at the intersection of roads the end of roads or where there is a change of name e aRoadNode feature representing the intersections crossings and ends of RoadLinks RR a a OS MasterMap user guide product specification chapter 1 2 v5 1 2 2004 Crown copyright Page 18 An OS MasterMap feature within the Road Routing Information RRI theme may be e a RoadNodelnformation feature representing routing information related to a RoadNode in the road network e a RoaoLink information feature representing routing information related to a RoadLink in the road network e a RoadRoutelnformation feature representing routing information related to one or more RoadLink features in the road network where direction of travel is relevant e a RoadPartialLink information feature representing routing information related to part of a RoadLink in the road network or e a RoadPartialRoute information feature representing routing information related to part of a RoadLink in the road network where direction of travel is relevant Feature life cycle The life cycle see Chapter 1 8 of each feature is matched where practically possible to that of the real world object it represents For example a new building will become a new object in our databas
183. the ITN Roads feature is removed from the database A record is kept in the database to indicate that the feature with this TOID used to exist Modification of ITN Roads features due to real world change When an ITN Roads real world object changes but is considered to still be the same feature the corresponding modified feature is retained in the database The version number is incremented and the date on which the new version became current is stored Where the real world object changes so significantly that it cannot be considered to be the same real world object then the original feature is deleted and a new one created In the case of ITN Roads features it may be that real world change has required a topological restructuring which means that features have to be split with at least one new feature that was part of an original feature being created Modification of ITN Roads features due to error correction When an ITN Roads feature is found to be incorrectly attributed due to an error or is moved due to the correction of a positional error the original feature is retained appropriately modified and with an incremented version number a EE OS MasterMap user guide product specification chapter 1 8 v5 1 2 2004 Crown copyright Page 113 Examples of the life cycle rules as applied to ITN Roads features ITN Roads features follow the same general guidelines as other OS MasterMap features The examples below highli
184. tion in the data are not usually the very accurate coordinates for the control point The accurate coordinates of the control point can be obtained from Ordnance Survey All triangulation stations are shown except for buried and surface blocks e Bench marks these are physical marks the altitude of which relative to Ordnance Datum has been determined by levelling The best known form is an arrow cut into masonry often found on building corners and bridges All current bench marks except for those on a triangulation pillar are shown by a point feature or symbol The altitude to two decimal places of a metre is shown by a textual description Please note that more up to date and detailed information about a bench mark may be held by Ordnance Survey The bench mark symbol is not shown on triangulation pillars e Spot heights these are non physical points the altitude of which relative to Ordnance Datum has been determined by levelling All current spot heights are shown by a point feature or symbol The altitude to one decimal place of a metre is shown by a textual description RRR a OS MasterMap user guide product specification chapter 1 4 v5 1 2 2004 Crown copyright Page 47 Physical horizontal and vertical control features shown are e bench mark and e triangulation station Non physical horizontal and vertical control features shown are e spot height and e textual descriptions for the features described above Const
185. tionship with the topographic features in their locality This relationship is known as a boundary mereing This relationship is recorded within OS MasterMap as a textual description A list of the most common abbreviations is given below Abbreviation Object or mereing Abbreviation Object or mereing Baulk bank base basin bridge broad B Mean high water MHW Cam canal causeway centre of channel cliff C Mean high water springs MHWS conduit cop course of covered culvert cut Scotland only Dam ditch dock double down drain D Mean low water MLW Double ditch or drain DD Mean low water springs Scotland only MLWS Double fence DF Metres m Defaced Def Old O Edge of eyot E Passage path plate pond post P Face of fence fleet foot freeboard F Race railway ride river road root of R Feet ft Root of hedge RH Harbour hedge H Scar sewer side of slope sluice stone S stream Inches Ins Top of i Kerb K Track Tk Lade lake lead loch lockspit lynchet Undefined Und Marsh mere moat M Wall weir W OS MasterMap user guide product specification chapter 1 4 v5 1 2 2004 Crown copyright Page 37 The following are examples of combined abbreviations Object or mereing Abbreviation Centre of bank basin baulk broad and so on CB Centre of railway river road and so on CR Centre of old course of stream COCS 1 22 metres root of hedge 1 22m RH NOTE Special rules apply to boundary mereings and only the more
186. ts and services directly to customers e delivery The delivery of Ordnance Survey digital products and services to customers by electronic means primarily by use of Internet technology e ordering The ability for customers to request the supply of products and services by the use of Internet technology estimate A single price being offered to the OS MasterMap customer as the cost of a proposed service definition agreement event type The type of event that has resulted in a new version of a feature This could be created modified or deleted RRR a OS MasterMap user guide product specification appendix A v5 1 2 2004 Crown copyright Page 179 feature An abstraction of a real world object It is not the real world object itself The OS MasterMap product is composed of discrete vector features each of which has a feature type geometry and various feature attributes feature attribute See attribute feature code See the Reference section OS MasterMap user guide feature topology See topology feature type A high level grouping of features that are treated in a similar way for example TopographicPoint or RoadLink features FTP File transfer protocol A protocol that allows a user on one computer to transfer files to and from another computer over a TCP IP network for example Internet geoid An imaginary shape for the Earth defined by mean sea level and its imagined continuation under the continents at the sa
187. tumvcitnioinicici bl cetonas cotas dotada Further examples of RRI features with exceptions Chapter 1 8 Life cycles of OS MasterMap features Introduction Purpose Feature life cycles The purpose TODS dare E A NN Area feature life Cycle rules ooonnoninocccnnncaciconancnconannncnnnn Creation of area features due to real world change Deletion of area features due to real world change Modification of area features due to real world change Modification of area features due to error COTMTecCtiON ooooooococonccccnnnooooncncnncnnnnnnnnnnnnnnnnn non nnn cnn nn anne nn nn nn nn anne nn nn rnnnnnn naar nnrnrrnnannnennnn Line feature lite Eycls TUlES A A A a Creation of line features Deletion of line features Modification of line features due to real world Change Modification of line features due to error correction ooococcococccccccccnooannnncnncnnnannnnnnnnn nn anne nn nn rn rn nan n nn nn nn nr nana nn rn rnnrnnn nana nrrnrrnnannanarnnn Fomtieature liie Cycle les iia a A E de nd Creation of point features Deletion of point features Modification of point features due to real world COaNYl ccocinoncccnnoncncnonnccnnonnnconnnnnnnnnnn nr nano nrnn nana narran nr rr naar rr nn ana nara nn nr rra racannnn 0 AREA OS MasterMap user guide product specification contents v5 1 2 2004 Crown copyright Page 7 Modification of point features due to error COPE CTION ooococcccnnccccccnonnncnononcnnnnnn cnc nono cn
188. ue to PAI or any other error correction not linked to real world change are treated as detailed in Modification of line features due to error correction later in this chapter Examples 1 An area of agricultural land is wholly planted with trees there are no changes to its bounding features The descriptiveGroup of the feature changes but its geometry is unchanged The feature is retained 2 An area of woodland is felled and the area now consists of rough grass and scrub The feature is retained 3 A barn is converted into a private dwelling There is no change to the classification attributes of the feature and the feature is retained Modification of area features due to error correction When an area feature is changed solely to correct errors either in geometry or other attributes then the feature is retained If the feature has been moved to correct an error and simultaneously modified for real world change then the feature modification rules above are followed OS MasterMap user guide product specification chapter 1 8 v5 1 2 2004 Crown copyright Page 108 Examples 1 A line feature representing an old fence is found to have an error in its position and is corrected The line feature and the area features bounded by it are retained The version numbers of the features involved are incremented 2 The feature representing an area of road has been assigned an incorrect descriptive group The feature is reclassified and retain
189. urce units xml metres gt 0 25 lt osgb resolution gt lt osgb fileSize uom http www ordnancesurvey co uk xml resource units xml MegaBytes gt 123 765 lt osgb fileSize gt lt osgb control gt GPS and OSTN97 lt osgb control gt lt osgb createdBy gt Ordnance Survey lt osgb createdBy gt lt osgb correctionType gt Orthorectified lt osgb correctionType gt lt osgb OrthoImageMetadata gt RR a a OS MasterMap user guide product specification chapter 1 6 v5 1 2 2004 Crown copyright Page 64 Chapter 1 7 ITN Roads Layer Overview The OS MasterMap ITN Roads theme is the first component of the OS MasterMap ITN Layer which may ultimately include rail water and pedestrian components It consists of a fully topologically structured link and node network representing the driveable roads of Great Britain The network lines are in geometric sympathy with topographic detail Information about the factors that may influence a driver s choice of route is available as an optional theme This is described as Road Routing Information and is only useful to those with access to the network data The product includes the following e road classifications e road names e types of road e motorway junctions e information potentially relevant to routing and e references to the intersecting topographic polygons Our intention is that the road network will be continually updated following update of OS MasterMap topography an
190. ured between the same features on the ground This measurable refers to well defined points in the real world for example building corners or fence junctions Certain types of features such as underground features vegetation and landform limits can be surveyed to a lesser degree of accuracy RRR a a OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 143 Conformity Ordnance Survey has continually sampled data and tested the relative accuracy of well defined points of detail The table below shows the aggregated average results of testing from the last 30 years Data capture standards Relative error Maximum measured distance original capture scale 99 confidence level urban 11250 Rural 1 2500 resurvey or reformed 100 0 m Rural overhaul 1 2500 47 200 0 m pre positional accuracy improvement ES i Mountain and moorland 1 10 000 Eli Example of relative error statistic Urban 1 1250 Ifthe distances between well defined points of detail 60 0 m apart were measured in the real world there is an expectation that 95 would be represented in OS MasterMap by a scaled distance of between 59 2 m and 60 8 m Correction Any reported errors outside the expected range are addressed during the normal update cycle or earlier if warranted by their impact on customers business Improvement Ordnance Survey is improving the positional accuracy of OS MasterMap rural overhaul ar
191. ures is currently based upon spatial intersection Therefore where one road crosses another at different levels the RoadLink and RoadNode features on the lower level will reference TopographicArea features at a higher level than the road they actually represent The Topography Layer has been significantly revised during the creation of the OS MasterMap ITN Roads Layer particularly road area features In the first release of the OS MasterMap ITN Roads Layer the referenceToTopographicArea attribute from RoadLink and RoadNode features may be out of date referencing topographic features no longer existing or with incomplete references OS MasterMap user guide product specification chapter 1 12 v5 1 2 2004 Crown copyright Page 174 Multilingual names The GML language qualifier for English Gaelic and Welsh names for Road features has not been applied consistently Bilingual names are present but not correctly described as English Gaelic or Welsh Deleted and reinserted addresses on PAF Occasionally the source address on PAF will have been deleted and reinserted as a new address by Royal Mail during update instead of making an amendment to the existing address The effect will be that the address will appear with a new TOID for the same address In most instances Ordnance Survey prevents this effect in the data supplied by using software to identify and prevent this occurring in the data but cannot guarantee to be 100 successful
192. urvey purposes a path made or unmade is defined as any established way other than a road or track Made paths Made paths are those whose surface is paved or metalled Only major paths are shown in parks public gardens cemeteries and so on Made paths are described by the annotation Path except in the following circumstances e in built up areas the description will not normally be recorded and e if the path has a distinctive name such as Simmons Walk Unmade paths Unmade paths are those that are neither paved nor metalled An unmade path is included in the Topography Layer when its entire length is evident on the ground and it starts at a road track or path and finishes at a similar feature or a specific place of interest Unmade paths are described by the annotation Path um in urban and rural areas RRR a OS MasterMap user guide product specification chapter 1 4 v5 1 2 2004 Crown copyright Page 44 Rights of way Physical features shown in the roads tracks and path theme please note that rights of way are not identified in the Topography Layer The representation of a road track or path is no evidence of a right of way e kerb lines or the limits of metalling representing e road furniture such as e carriageway limits including any hard shoulder or e mile postst shallow drainage gullies forming the side of the road on dual carriageways or motorways e guide posts traditional finger posts only e kerbed rounda
193. very feature No intelligence for example its coordinate position about the feature can be derived from either the allocated number or the process by which it is allocated The TOID will remain with the feature throughout its life and will not be reassigned to a new feature when the existing feature is deleted topological polygon One of the options for OS MasterMap product feature geometry topology in which area features use references to line features to describe their geometry In topological output the bounding line between two area features will only be represented once as a line feature The two area features will contain a reference to this line feature as part of their bounding line rather than explicitly describing the geometry of that line themselves This is distinct from the independent polygon product topology A fully structured data model in which area features reference the line features that bound them and bounding lines are shared between area features As such areas know which areas they are surrounded by and which areas they contain OS MasterMap data is not supplied in fully topological form OS MasterMap user guide product specification appendix A v5 1 2 2004 Crown copyright Page 186 tuple coordinate tuple A set of n coordinates representing a point in n dimensional space as defined by a spatial reference system The British National Grid reference system is 2 D only so coordinate tuples consist of an east
194. vious Ordnance Survey roads products that have been reclassified OS MasterMap user guide product specification chapter 1 7 v5 1 2 2004 Crown copyright Page 66 Representation of the road network Road names and numbers Named and numbered roads are captured as Road features within the data A Road feature represents a named or Department for Transport DfT numbered road for example Romsey Road or the A38 The feature includes information on the road type named motorway A road or B road the name or number and a set of references to the RoadLink features that provide the network topology of the road The road name is that collected by Ordnance Survey and ordinarily collected during a ground visit DfT road numbers are based upon either a ground visit or information from the DfT The Road feature represents the named or numbered road therefore a section of road that has both a name and number will have two independent road features one for the name and one for the DfT number Any single RoadLink may be referenced by more than one road feature though not usually by more than a single named or single numbered road For example the A3057 and Romsey Road may both refer to at least some of the same links however an individual link would not ordinarily be referenced by both the A3057 and the A35 The hierarchy for allocation where classified roads join is described below An exception to the above is for numbered roads that have sections

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