1:10 000 Scale Raster user guide and technical specification
Contents
1. 9 POX ane 9 Chapter 5 Data compressiDH ci eire xir Leroy hans pe roe ku Pado usb e pas disk ok eva repu s s RRAES Kino Uo Poe Aran xo 10 Image comipressSlOD acier ecce recie eme ove beck edv obe ended Pte rede de AA 10 Lossless CompressiOh mtt eed a a eta e eed Eu ed ey RR nu dn 10 LOSSY COMPFESSION e T 10 Mcr 10 Chapter 6 Georeferencilng 2 c ero erae tene tora rone ea Chee cots e ete x doe eonvsyace does este Re tede creo snp eE E Xeno EE Renee ERE 11 Chapter 7 RIQZLIPIMO CORBIS LIUM 12 Chapter 8 Data MeasUres ote ceti eee herons e ERE EXE KR ERR DARE RE ERR ERRAR RARE RE EUER ra BARES SES EX ER Karask AEEA EA 13 Annexe A Gase EDD Ij 14 Creating the right environment for data management ssssssssssseeeeeee 14 The welsh Environmental Data Interface WENDI sss 14 Annexe B Mlclrrm 15 Annexe C Product and service performance report form cccceseesseeseeeeeeeeeeeeeeeneeeeseeeseeeeeeeeaees 16 v2 2 4 2009 EM LV ORE ULA AAIPeI G Y 1 10 000 Scale Raster user guide Obcontents v2 2 4 2009 Crown copyright Page 2 of 31 Preface This user guide hereafter referred to as the guide is designed to provide an overview of 1 10 000 Scale Raster hereafter referred to as the product and it gives guidelines and advice on how a customer might derive the maximum benefit from t2. Any part of this specification may be copied for use internally in your organisation or business so that you can use 1 10 000 Scale Raster for the purpose for which it is licensed to your organisation or business but not otherwise No part of this specification may be reproduced or transmitted in any form or by any means including electronically for commercial exploitation without the prior written consent of Ordnance Survey No part of this specification may be copied or incorporated in products services or publications that you generate for onward sale or as free promotional or support materials without the prior written consent of Ordnance Survey 0 00 o NENENNMHNK KE MERNNNNMNMENMNMNMNMN NNI 1 10 000 Scale Raster technical specification 11bintroduction v2 2 4 2009 Crown copyright Page 18 of 31 Chapter 1 Specification The following chapters include information about 1 10 000 scale colour black and white raster data file compression symbology georeferencing and formats Specification Data source Number of tiles in Great Britain Tile size Availability Resolution Data structure Data specification Colour Transfer format Storage volumes per tile Black and White Transfer format Storage volumes per tile Update frequency 1 10 000 Scale Raster 1 10 000 scale production database 10 586 edgematched e England 5 702 e Scotland 4 014 e Wales 1 008 5 km by 5 km
3. Inch 2 Inch DateTime 306 2006 09 20 11 20 04 2006 09 20 11 20 04 ColorMap 320 1st 4 values 65535000 1st4 values 65535000 Copyright 33432 ORDNANCE SURVEY ORDNANCE SURVEY CROWN COPYRIGHT 2004 CROWN COPYRIGHT 2004 The tag values listed in the above table are relevant to 1 10 000 scale Motorola TIFF raster data It should be noted that customers can access tag information from a raster file image by right clicking on a TIFF data image and looking at properties and then left clicking on summary HP4ONE TIF Properties i 21x General Summary Tagged Information File Format TIFF 7874 7874 Horizontal R 400 3 vertical Res L Bit Depth O Color Repre Compression Cancel Apply 1 10 000 Scale Raster technical specification chapter 4 v2 2 4 2009 Crown copyright Page 23 of 31 Black and white image directory TIFF Tag TIFF packbits TIFF Group 4 Group 3 number uncompressed compression compression File Byte order MM MM MM MM Big endian Big endian Big endian Big endian Magic number 42 42 42 42 Number of fields in IFD 15 15 16 17 NewSubfileType 254 0 0 0 0 Image Width 256 7874 7874 7874 7874 ImageLength 257 7874 7874 7874 7874 BitsPerSample 258 1 1 1 1 Compression 259 32773 1 4 3 PackBits Uncompressed Group 4 Fax Group 3 Fax Photo Interpretation 262 1 1 0 0 BlacklsZero
4. National coverage 400 dots per inch Raster All map features except contours contour values air heights open sea stipple and other minor detail see annexe B TIFF 8 bit compressed LZW and uncompressed Uncompressed approx 60 Mb Compressed 8 Mb 15 Mb TIFF uncompressed BMP PCX TIFF Group 3 compression TIFF Group 4 compression and TIFF Packbits NOTE MapInfo version 8 supports TIFF Group 4 compression Uncompressed 8 Mb Compressed 0 3 Mb 6 Mb Continuous update see chapter 7 in the user guide Greyscale A high quality alternative to black and white data is to use a GIS to convert colour data to greyscale format NOTE Greyscale file sizes are significantly larger than black and white data for example greyscale 60 Mb uncompressed black and white 8 Mb uncompressed If LZW compressed formats are used then registration may be required Guidance on the Unisys license is available on the Unisys website at www unisys com about unisys Izw 1 10 000 Scale Raster is supplied in both colour and black and white uncompressed and compressed formats Colour raster formats e TIFF 8 bit uncompressed e TIFF 8 bit LZW compressed Black and white raster formats including e TIFF uncompressed e BMP e PCX e TIFF group 3 compression e TIFF group 4 compression e Tiff Packbits NOTE MapInfo version 8 supports TIFF Group 4 compression 0 A 1 10 000 Scale Raster technical specification chapt
5. 1 10 000 Scale Raster shows the following features e buildings structures and leisure areas e roads paths and tracks e vegetation and surface features e water features and associated detail e railways and associated detail e height and control information e archaeological and antiquity information e administrative boundary information e text and e miscellaneous information remote areas telephone lines foot bridges house names and all buildings The following administrative boundaries are shown Local government Parliamentary County England European electoral region District England Parliamentary electoral region Scotland Greater London Assembly constituency Parliamentary constituency England Unitary authorities Parliamentary constituency Westminster Civil parish England Parliamentary constituency Scotland Community Wales Assembly constituency Wales Assembly electoral region Wales Scottish and Welsh place area names Where a name has an alternative form in a different language and it is not possible to establish which of the two names is more useful and acceptable both names will be shown Where there is insufficient space to show both names only one will be shown e in Scotland the anglicised version and e in Wales the Welsh version 1 10 000 Scale Raster does not include contours contour values air heights or open sea stipple A list of other minor detail that is not inclu
6. BlacklsZero WhitelsZero WhitelsZero FillOrder 266 N A N A 2 2 ImageDescription 270 1 10000 TILE 1 10000 TILE 1 10000 TILE 1 10000 TILE HP40NE HP40NE HP40NE HP40NE XResolution 282 400 1 400 1 400 1 400 1 YResolution 283 400 1 400 1 400 1 400 1 ResolutionUnit 296 2 Inch 2 Inch 2 Inch 2 Inch T4Options 292 N A N A N A 4 DateTime 306 2006 09 20 2006 09 20 2006 09 20 2006 09 20 11 50 05 11 50 05 11 50 05 11 50 05 Copyright 33432 Ordnance Survey Ordnance Survey Ordnance Survey Ordnance Survey crown copyright crown copyright crown copyright crown copyright 2004 2004 2004 2004 The tag values listed in the above table are relevant to 1 10 000 scale Motorola TIFF raster data E KENNEN NNI 1 10 000 Scale Raster technical specification chapter 4 v2 2 4 2009 Crown copyright Page 24 of 31 Other formats for black and white raster data PCX Monochrome image directory File type PCX Palette 24 Bit Manufacturer 10 ZSoft pcx Version 5 Version 3 0 of PCPaintbrush Includes 24 bit PCX files Encoding 1 Bits per Pixel per Plane Window Xmin 0 Window Ymin 0 Window Xmax 7873 Window Ymax 7873 Window HDpi 400 Horizontal Resolution Window VDpi 400 Vertical Resolution Reserved 0 No of Planes 1 Palettelnfo 1 HScreenSize 0 Horizontal screen size in pixels PB IV IV only VScreenSize 0 Vertical screen size in pixels PB IV IV only The values listed
7. Orchard amp 6 Water features e o6 Coppice or osiers Water feature dil VLA Rough grassland m Direction of flow arrows GL Asly Const Greater London authority assembly constituency 3T diis Heath m Mean high water springs MHWIS Other information Rup Scrub E Oo Mean low water springs MUS Marsh salt marsh or reeds V Buildi The representation of a road track or path is no ulldings evidence of a right of way Ordnance Survey and the OS Symbol are registered trademarks of Ordnance Survey the national mapping agency of Great Britain General building Mean high water springs Mean low water springs Important building j Ordnance Survey Crown copyright Glasshouse D03942 1106 Version 2 1b Ordnance E SUrvey REEERE lial 1 10 000 Scale Raster technical specification chapter 2 v2 2 4 2009 Crown copyright Page 20 of 31 Chapter 3 Georeferencing A definition for registering raster images within a geographic framework is the process of assigning map coordinates to the raster image data and resampling the pixels of the image to conform to the map projection grid This allows tiles of map data to be located in their correct geographic position relative to the map projection and also to themselves Great Britain is surveyed and mapped using the Transverse Mercator or Gauss Kruger projection so all raster tiles will be mapped to this projection as it applies t
8. Survey products or a customer s own geographic business data besides providing a detailed geographic context in its own right 1 10 000 Scale Raster is produced to provide customers with a detailed product that could be made available in a number of different formats to provide either a map of an area when used on its own or as a means of providing geographic context to help a customer visualise their own data RR 1 10 000 Scale Raster user guide chapter 1 v2 2 4 2009 Crown copyright Page 5 of 31 1 10 000 Scale Raster is supplied as graphic image files that can easily be read by many image software packages To view tiles in geographic relation to each other and to create the best context for its use with other Ordnance Survey or third party data it is recommended that it is used in a geographical information system GIS As can be seen from figure 1 above the pattern of development within the landscape can clearly be seen and this makes 1 10 000 Scale Raster particularly useful for analysing data within urban areas 1 10 000 Scale Raster is typically used to create and plot high quality maps for producing site plans web services showing locations creating maps for use in reports and presentations and providing geographic context for a customer s own data subject to the terms of that customer s licence 0 0 1 10 000 Scale Raster user guide chapter 1 v2 2 4 2009 Crown copyright Page 6 of 31 Chapter2 Content
9. O S Survey 1 10 000 Scale Raster User guide and technical specification 1 10 000 Scale Raster User guide Contents Section Page no adire NN ec 3 Gontact det alls enceinte ne n aane nnd p Ene ak Dana DER Rn e aT EXER OE dea ER YYRS 3 NETTO SrXoreiut 3 P rpose and Te IRI PT 3 Copyright in this guide 3 nt x tenet tre EC edle beet rhet ee tad LE ce RR Pointe Fa ie aset 4 Data copyright and other intellectual property rights ssseee 4 Hr cet 4 Back up provision of the product sssssssssssssseseseeeen eene nennen ener entren 4 BETRUG 4 Chapter 1 piget e 5 Chapter 2 jj 7 Scottish and Welsh place area names sssssssssseseseeeenen nennen enne nnns 7 Chapter 3 pL 8 Coordina ES 3 p erhosietetesu ieri den lueret tients teseed bio Ae hee 8 eT rome EET 8 Chapter 4 gre 9 ui c 9 TIFF compressions explained srno era etn ete en eene e e YR En RR Ren IR ERE 9 l M 9 BMP Suture RETE 9 Xo
10. TIFF sssssssssseeeeee enne 24 Other formats for black and white raster data eene 25 PCX Monochrome image directory sessssssssse eee 25 BMP Black and white image directory ssssssseeeem 25 Annexe A GIOSSANY 26 Annexe B Other minor detail that is not included on 1 10 000 Scale Raster product 31 v2 2 4 2009 0 0 E 1 10 000 Scale Raster technical specification 10bcontents v2 2 4 2009 Crown copyright Page 17 of 31 Introduction Purpose of this specification and disclaimer This is the technical specification hereafter referred to as the specification applicable to the 1 10 000 Scale Raster hereafter referred to as the product which is referred to in the Framework Direct Licence Specific Use Framework Partner Licence or your other customer contract for the product We may change the information in this specification at any time giving you the notice period specified in the customer contract made between you and Ordnance Survey We do not accept responsibility for the content of any third party websites referenced or accessed in or through this specification any other contractual documentation and or the Ordnance Survey website Copyright in this specification This specification including for the avoidance of doubt any mapping images reproduced herein is Crown copyright 2007 All rights reserved
11. a It is stored so that specific applications can access the data by different logical paths A database is accessed and managed by a database management system software for managing database information Data format A specification that defines the order in which data is stored or a description of the way data is held in a file or record Data quality Attributes of a dataset that define its suitability for a particular purpose such as completeness positional accuracy currency and so on 0 A 1 10 000 Scale Raster technical specification annexe A v2 2 4 2009 Crown copyright Page 26 of 31 Data structure The defined logical arrangement of data as used by a system for data management a representation of a data model in computer form Data transfer medium This is the means by which computer files are transferred from one computer to another Transfer media may be subdivided into communications media and physical media Dataset Data as supplied in a particular format to customers whether internal or external to Ordnance Survey Density A measure of the number of units of data held on a stated length of storage surface For example some magnetic tapes may be recorded at a density of 1 600 bits per inch bpi Often referred to as packing density Delivery mechanism The method of supply of data to a customer such as offline and online Descriptive name A name describing a real world object or feat
12. cations that can import TIFF graphics BMP BMP files are a historic file format for Windows operating system Images for black and white are 1 bit per pixel This file format is only available for the black and white version of the product BMP structure A BMP file consists of either three or four parts The first part is a header which includes the position of the image and the number of colours to be displayed This is followed by an information section which contains the image width part 2 height part 3 and the type of compression part 4 PCX The PCX format is a relatively simple format that provides a minimum of compression using Run Length Encoding RLE RLE means that the file can be read from start to finish in one pass This is only available for the black and white raster product option PCX structure The PCX file itself contains two parts the first part is called the header which contains information about the image the second part is the image data which contains actual image data and colour information 0 0 NENENENENMNMEIHREKAEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEENI 1 10 000 Scale Raster user guide chapter 4 v2 2 4 2009 Crown copyright Page 9 of 31 Chapter5 Data compression The data volumes for each file format are influenced by the level of data compression Image compression When an image is compressed duplicated data that has no value is removed or save
13. converted from its original format to the ECW format However wavelet compression is very good at retaining the character of images so the amount of loss is very small JPEG An image named after the Joint Photographic Experts Group it uses a lossy compression format It is designed for compressing a full colour or greyscale images of natural real world scenes and works well on photographs It is the de facto standard for photographs on the web o 1 10 000 Scale Raster technical specification annexe A v2 2 4 2009 Crown copyright Page 27 of 31 Encoding The process of converting information to a computer readable form for example digitising maps Extended binary Coded decimal Interchange code EBCDIC An 8 bit character encoding scheme For example 100111100 These can also be letters or specific characters for example Feature A geographic entity such as a building or stream either taken from a map or surveyed directly from the real world Can be a point symbol text or line Format The specified arrangement of data for example the layout of a printed document the arrangement of the parts of a computer instruction the arrangement of data in a record Geographic coordinates Coordinates usually expressed as latitudes and longitudes which define position on the Earth s surface Georef A definition for registering raster images within a geographic framework is the process of assigning map coordinates to the raste
14. d in a shorter form reducing a file s size For example if large areas of water are the same tone only the value for one pixel needs to be saved together with the locations of the other pixels with the same colour When the image is edited or displayed the compression process is reversed When raster is compressed not only are the data volumes reduced but the user can download display edit and transfer images more quickly There are two forms of compression lossless and lossy Lossless compression As its name suggests lossless compression does not lose information within an image A lossless compression retains the original quality of an image when it is uncompressed This process doesn t provide much compression so file sizes remain large Lossless compression is used mainly where detail is important such as when planning to make large prints Lossy compression This process degrades images to some degree meaning that the decompressed image isn t quite the same as the original The more an image is compressed the more degraded it becomes In many situations such as posting images on the Internet or printing small to medium sized prints the image degradation isn t so obvious If a lossy compressed image like the one shown in figure 3 below is over enlarged the degradation will become apparent and therefore 1 10 000 Scale Raster is not supplied using this compression Hs ZA c N A N Figure 3 E
15. ded on 1 10 000 Scale Raster can be found in annexe B in the technical specification 0 0 NENNENMNMEIU RRNMEEEENEEEENEN 1 10 000 Scale Raster user guide chapter 2 v2 2 4 2009 Crown copyright Page 7 of 31 Chapter3 Scale 1 10 000 Scale Raster is derived from large scale information surveyed at e 1 1250 scale covering major towns and cities e 1 2500 scale smaller towns villages and developed rural areas and e 1 10 000 scale mountain moorland and river estuary areas Generalisation is used to emphasise simplify select and sometimes omit features to produce a cartographic representation of the landscape at a scale of 1 10 000 The recommended printed copy or plot output is at 1 10 000 scale but viewing the data on a computer screen is normally between 1 5000 and 1 8000 scale Coordinates 1 10 000 Scale Raster is available in National Grid coordinates which are expressed in metres relative to an origin set to a point west of the Isles of Scilly These coordinates can easily be spatially related to other surveys drawings datasets or Ordnance Survey products Customers can visit the National Grid pages of Ordnance Survey s website for more information Coverage 1 10 000 Scale Raster is supplied in standard 5 km by 5 km tiles aligned to the National Grid This is the equivalent in area to 2 500 hectares 0 0 0 o NENNEN 1 10 000 Scale Raster user guide chapte
16. eptual rules or model Domain consistency How closely the data values in the dataset match the range of values in the dataset specification Format consistency The physical structure syntax how closely the data stored and delivered fits the database schema and agreed supply formats The explicit topological references between features connectivity according to specification Topological consistency Absolute accuracy How closely the coordinates of a point in the dataset agree with the coordinates of the same point on the ground in the British National Grid reference system Relative accuracy Positional consistency of a data point or feature in relation to other local data points or features within the same or another reference dataset Geometric fidelity The trueness of features to the shapes and alignments of the objects they represent Temporal How well ordered events are recorded in the consistency dataset life cycles Temporal validity currency Validity of data with respect to time the amount of real world change that has been incorporated in the dataset that is scheduled for capture under current specifications Classification correctness How accurately the attributes within the dataset record the information about objects When testing the data according to the dataset specification against the real world or reference dataset 0 00 1 10 000 Scale Raster use
17. er 1 v2 2 4 2009 Crown copyright Page 19 of 31 Chapter2 Legend 1 10 000 Scale Raster Legend CIIU eee County England only Pra Spot heights im Gravel pit fixed by ground survey District unitary authority Bench mark where shown e Rock i s metropolitan district BM 123 45 m mato London borough TER Triangulation station A Rock scattered 2 pum Civil parish or community Shingle Boro constituency county Point and line features Mud constituency burgh constituency parliamentary constituency TT parliamentary electoral region Pylon flare stack or R Boulders T ME assembly constituency assembly NEPOS lighting tower S ew A electoral region European n Fe electoral region or Greater London General detail 1 Boulders scattered ES authority assembly constituency 2 Underground detail Z Z Refuse tip or slag heap Boundary post or stone o s Overhead detail Zn Sand Boundary tree Oak Q Narrow gauge railway Sand pit e PESE a Multi track railway Slopes mmm Vegeta n Single track railway Top of cliff FTTTTTTTT e LLELLLLLJ Area of wooded vegetation Point feature 2 for example GP MS MP Non coniferous trees Non Roman antiquity Cast Common abbreviations Non coniferous trees scattered Site of antiquity E Boundary information Coniferous trees Telephone line where shown EEE Coniferous trees scattered Electricity transmission line with poles Positioned tree
18. er of bytes in that strip after compression for example 1st 4 values 143 143 155 155 Tag 282 XResolution The number of pixels per Resolution Unit in the Image Width for example value 400 1 Tag 283 YResolution The number of pixels per Resolution Unit in the Image Length for example value 400 1 Tag 296 ResolutionUnit Units used for Resolution for example value 2 Inch Tag 306 DateTime Date and time of image creation for example value 2006 06 30 12 38 41 Tag 320 ColourMap Look up table for example value 1st 4 values 65535000 Tag 33432 Copyright Copyright notice for example value ORDNANCE SURVEY CROWN COPYRIGHT 2004 NOTE The values given above are relevant to 1 10 000 scale data 00 00 A 1 10 000 Scale Raster technical specification chapter 4 v2 2 4 2009 Crown copyright Page 22 of 31 TIFF Colour image directory TIFF Tag number TIFF 8 bit uncompressed TIFF 8 bit LZW compressed File Byte Order MM Big endian MM Big endian Magic Number 42 42 Number of fields in IFD 16 16 NewSubfileType 254 0 0 Image Width 256 7874 7874 ImageLength 257 7874 7874 BitsPerSample 258 8 8 Compression 259 1 5 Uncompressed LZW Photo Interpretation 262 3 RGB Palette 3 RGB Palette ImageDescription 270 1 10000 TILE HP40NE 1 10000 TILE HP40NE XResolution 282 400 1 400 1 YResolution 283 400 1 400 1 ResolutionUnit 296 2
19. gs are unique numbers that are used for identifying specific information in TIFF files for example image width image length bits per sample photo interpretation and resolution Terminator Character or character string or field or record used to signal the end of a record or section or volume or database Tile A unit of map used to divide large areas into regular and more manageable sizes TIFF TIFF is a tagged image file format based file format for storing and interchanging raster images with the most recent version 6 0 published in 1992 Transfer format The format used to transfer data between computer systems In general usage this can refer not only to the organisation of data but also to the associated information such as attribute codes which are required in order to successfully complete the transfer Transfer medium The physical medium on which digital data is transferred from one computer system to another For example compact disc 0 0 A 1 10 000 Scale Raster technical specification annexe A v2 2 4 2009 Crown copyright Page 29 of 31 UNIX An operating system that supports multitasking and is used by many work stations and mini computers Update The process of adding to and revising existing digital map data to take account of change Volume A physical unit of the transfer medium that is a single disk or a single DVD 1 10 000 Scale Raster technical specification annexe A
20. he product It assumes a general knowledge of geographic information If you find an error or omission in this guide or otherwise wish to make a comment or suggestion as to how we can improve the guide please contact us at the address shown below under contact details or complete the product and service performance report form at annexe C and return it to us Contact details Our Customer Service Centre will be pleased to deal with your enquiries Customer Service Centre Ordnance Survey Romsey Road SOUTHAMPTON SO16 4GU General enquiries calls charged at local rate 08456 05 05 05 Dedicated Welsh Language HelpLine 08456 05 05 04 Textphone deaf and hard of hearing users only please 44 0 23 8079 2906 Email customerservices ordnancesurvey co uk or visit the Ordnance Survey website at www ordnancesurvey co uk This document has been screened in accordance with the requirements set out in Ordnance Survey s Equality Scheme If you have difficulty reading this information in its current format and would like to find out how to access it in a different format Braille large print computer disk or in another language please contact us on 44 0 8456 05 05 05 Use of the product The terms and conditions upon which the product including this guide is made available to you and your organisation are contained in the customer contract made between you and Ordnance Survey If there is an inconsistency between the terms of your customer con
21. ication please refer to the glossary at the end of the document 0 NENNEN 1 10 000 Scale Raster user guide 1bpreface v2 2 4 2009 Crown copyright Page 4 of 31 Chapter 1 Introduction 1 10 000 Scale Raster is the most detailed product in Ordnance Survey s raster portfolio providing contextual map data generated from large scale source information 1 10 000 Scale Raster is available as both colour and black and white in a number of file formats Examples of the colour and black and white versions are shown in figures 1 and 2 below HO 7 J n e poy af 4 t 4 AN ory 9S eae ae TEES AN ES Nursling 2 ji hiiia disuse e V A SS Rx mw X EO Q oco O Figure 2 Example of 1 10 000 Scale Black and White Raster The product provides an image where the detail has been converted to a grid of pixels which can then be displayed on computer screens The product covers all of Great Britain and is supplied as tiles aligned to the National Grid Data is converted into a raster format at a resolution of 400 dots per inch dpi and a pixel is equivalent to 0 635 of a metre on the ground This resolution has been chosen as it maintains the necessary clarity for text shown on the map The colour version assigns a colour to each pixel the black and white version assigns the colour black or white to each pixel The product can be overlaid with other Ordnance
22. in the above table are relevant to 1 10 000 scale Motorola PCX raster data BMP Black and white image directory FileType BM Windows or OS 2 single image BMP Reserved1 0 Reserved2 0 Pixel offset 62 Header Size 40 Windows 3 x Windows NT BMP Pixel width 7874 Pixel height 7874 Planes 1 Bits per pixel 1 Compression 0 Uncompressed Size of Bitmap 7779512 X Pixels per metre 15748 Y Pixels per metre 15748 Colours in palette 2 Significant Colours 0 The values listed in the above table are relevant to 1 10 000 scale Motorola BMP raster data kr 1 10 000 Scale Raster technical specification chapter 4 v2 2 4 2009 Crown copyright Page 25 of 31 Annexe 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 1 10 000 Scale Raster American Standard Code for Information Interchange ASCII A standard binary coding system used to represent characters within a computer Binary digit BIT The smallest possible unit of data resulting from a choice between 0 and 1 Boundary A boundary forms the division between two similar real world objects for example property boundary or administrative boundary and is defined by one or more lines Byte A unit of computer storage of binary data usually comprising 8 bits equivalent to a character Character A d
23. istinctive mark an inscribed letter one of a set of writing symbols Character code The binary representation of a single element of a character set for example EBCDIC ASCII Coordinate pair A coordinate pair is an easting and a northing see rectangular coordinates Coordinate transformation A computational process of converting an image or map from one coordinate system to another Compact disc Read only memory CD ROM A data storage medium A 12 cm disc similar to the audio CD It is an alloy disc pitted with tiny holes and then coated in plastic A laser head reads the pattern of the holes and translates them into binary data Copyright The sole legal right to print or publish a work Crown Copyright subsists in all Ordnance Survey publications for a 50 year period from the end of the year in which they were first published by virtue of the Copyright Designs and Patents Act 1988 Customer An organisation or individual that makes use of Ordnance Survey s data supply facilities This includes both direct sales customers of Ordnance Survey as well as customers of Licensed Partners It does not include anyone or any organisation that has access to Ordnance Survey material without charge Data A representation of facts concepts or instructions in a formalised manner suitable for communication interpretation or processing Database An organised integrated collection of geographic data which may or may not be spatial dat
24. nlarged lossy compressed image TIFF TIFF is one of the most commonly used ossless image formats TIFF is primarily designed for raster data interchange and is supported by numerous image processing applications This permits much more efficient access to very large files that have been compressed 0 00 o MNENNENENMNMEEERRORSEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEENENI 1 10 000 Scale Raster user guide chapter 5 v2 2 4 2009 Crown copyright Page 10 of 31 Chapter 6 Georeferencing To be able to view each tile in the correct geographic relation to the National Grid and to each other the tiles must be georeferenced GIS typically provide georeferencing as part of their functionality but for each set of tiles it is necessary to provide the information on how the tiles should be ordered Ordnance Survey provides this information in a set of georeferencing files also known as world files A complete set for 1 10 000 Scale Raster is available to download free of charge from the 1 10 000 Scale Raster product page on the Ordnance Survey website There are several different types of world file Prior to downloading one of the sets customers are advised to check with their system suppliers to find out which type their system supports The conventions behind the files creation can be found in chapter 4 of the technical specification By using the conventions outlined there this means that other datasets using the same c
25. ntractual documentation and or the Ordnance Survey website 00 NENENENMBERISCEEEEEEENNEENNNNENNNENNENN 1 10 000 Scale Raster user guide 1bpreface v2 2 4 2009 Crown copyright Page 3 of 31 Copyright in this guide This guide including for the avoidance of doubt any mapping images reproduced herein is Crown copyright 2009 All rights reserved Any part of this guide may be copied for use internally in your organisation or business so that you can use the product for the purpose for which it is licensed to your organisation or business but not otherwise No part of this guide may be reproduced or transmitted in any form or by any means including electronically for commercial exploitation without the prior written consent of Ordnance Survey No part of this guide may be copied or incorporated in products services or publications that you generate for onward sale or as free promotional or support materials without the prior written consent of Ordnance Survey Data copyright and other intellectual property rights The Crown or where applicable Ordnance Survey s suppliers owns the intellectual property rights in Ordnance Survey digital map data Full details of the terms and conditions under which Ordnance Survey digital map data may be processed and or manipulated or copied by a customer whether or not for use on PCs or workstations or for making hard copies are available from
26. o Ordnance Survey National Grid if using World or TAB files supplied by Ordnance Survey Within the MIF record header the following information will be found under COORDSYS CoordSys Earth Projection 8 79 m 2 49 0 9996012717 400000 100000 Bounds 4 17232513428e 011 7 7486038208e 01 1 700000 1300000 This information relates to the Transverse Mercator projection its position relative to the rest of the world and also an individual tile s position relative to the projection The record header is constructed as not all fields have to be used CoordSys Earth Projection 8 79 49 0 9996012717 400000 100000 Bounds 4 17232513428e 011 7 7486038208e 011 700000 1300000 the 8 relates to a Maplnfo identifier in this case the Transverse Mercator projection a Maplnfo identifier in this case this relates to Ordnance Survey of Great Britain 1936 Airy ellipsoid relates to the unit of measurement in this case metres this is the origin of the projection in respect of longitude this is the origin of the projection in respect of latitude indicates the distortion of the tile at the central meridian A value of 1 0 would indicate no distortion at all However distortion within this projection is minimal even at the far western or eastern limits these figures indicate the false origin of the British National Grid They represent the south west corner of the Transverse Mercator projection which overlays G
27. onventions can be imported into the same GIS to add value to the raster map So for example overlaying a routing or logistics network over the map or displaying a customer s demographic information The georeferencing files should be saved in the same directory as the files of the map tiles themselves 0 00 o NENNENENMEKRRRRSRNNNNNNENENENENENENENMMNNMDDMEEENEN 1 10 000 Scale Raster user guide chapter 6 v2 2 4 2009 Crown copyright Page 11 of 31 Chapter7 Revision The product is updated via a revision programme The revision programme for 1 10 000 Scale Raster is determined by assessing the following factors e known surveyed change indicated by the surveyor e change indicated by photogrammetric survey which includes rural survey sweep and e consideration is given to how long since an area was last revised Priority is given to prestige sites categorised as significant items of change such as major road construction projects All tiles in the revision programme are fully revised which means that all surveyed change is included in the revision not just significant items of survey change Where a line feature ends by intersecting the tile edge it is matched with its corresponding feature on the adjacent tile so that both features end on the same unique coordinate and both features have the same feature code The representation of detail across the tile edge will be of a cartographically acceptable s
28. r 3 v2 2 4 2009 Crown copyright Page 8 of 31 Chapter 4 Formats 1 10 000 Scale Raster comes in a number of file formats These are e Tagged Image File Format TIFF uncompressed and compressed e Bitmap BMP e PCX PC Paintbrush File Format TIFF TIFF is a file based format for storing and interchanging raster images with the most recent version 6 0 published in 1992 There are two types of architecture for a TIFF Many mainframe computers use what is known as a big endian Motorola architecture Most modern computers including personal computers PCs use the little endian Intel system 1 10 000 Scale Raster TIFFs are supplied with Motorola architecture Converting between these two systems is possible but as a general rule modern software should be expected to handle both of these outputs without operator intervention The 1 10 000 Scale Raster conforms to the TIFF 6 0 standard Customers are recommended to contact their system suppliers to ensure that it can read the Motorola big endian TIFF architecture TIFF compressions explained Group 3 The universal protocol for sending fax documents across telephone lines The Group 3 protocol specifies CCITT T 4 data Group 4 A protocol for sending fax documents over ISDNs integrated services digital networks The Group 400 protocol supports images of up to 400 dpi resolution TIFF Packbit is a lossless compression scheme that is supported by virtually all appli
29. r guide chapter 8 v2 2 4 2009 Crown copyright Page 13 of 31 AnnexeA Case Studies Creating the right environment for data management The Welsh Environmental Data Interface WENDI Agriculture forestry and woodland account for 9096 of Wales land use Generating a wealth of insightful statistical information The National Assembly for Wales uses this data to inform policy assist decision making and help deliver a wide range of services to rural communities Read more at http www ordnancesurvey co uk oswebsite business casestudies pdf welsh environment data interface pdf S 1 10 000 Scale Raster user guide annexe A v2 2 4 2009 Crown copyright Page 14 of 31 Annexe B Metadata Metadata ISO 19115 compliant UK GEMINI discovery level metadata is provided for the data and can be found on the Glgateway www gigateway org uk The following is a detailed description of the metadata elements that are provided on the Glgateway Title The title of the product Abstract The abstract gives a brief description of the product Currency The currency takes the form of date of last update for the feature Lineage The lineage metadata takes the form of product specification name and date of product specification Spatial extent The spatial extent is supplied in the form of geographic identifiers for example England Scotland and Wales and in the form of geographic coordinates Spatial reference system The spatial reference s
30. r image data and resampling the pixels of the image to conform to the map projection grid Gigabyte Gb 1 073 741 824 bytes a measure of data storage capacity see megabyte Kilobyte Kb 1 024 bytes a measure of data storage capacity 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 Linear feature Map feature in the form of a line for example river boundary that may or may not represent a real world existent feature Local origin The local origin of rectangular coordinates is the south west corner of the 1 km by 1 km National Grid square they identify Map scale The ratio between the extent of a feature on the map and its extent on the ground normally expressed as a representative fraction for example 1 1250 1 50 000 and so on Megabyte Mb 1 048 576 bytes a measure of data storage capacity see gigabyte National Grid The metric grid on the Transverse Mercator projection used by Ordnance Survey on all post Second World War mapping to provide an unambiguous spatial reference in Great Britain for any place or entity whatever the map scale MrSid MrSid Multi resolution Seamless Image Database is a wavelet based image compressor viewer and file format for large raster images that enables instantaneous viewing and manipulation of images locally and over networks while main
31. reat Britain so all coordinates for any tile no matter what scale will always be positive these values represent the minimum bounding X and Y coordinates for the tile these values represent the maximum bounding X and Y coordinates for the tile E 1 10 000 Scale Raster technical specification chapter 3 v2 2 4 2009 Crown copyright Page 21 of 31 Chapter 4 Image file directory TIFF The image file directory for TIFF format will contain a selection of the following entries Tag 254 NewSubfileType An indication of the kind of data contained in this sub file for example Value 0 Tag 256 ImageWidth The number of columns in the image the number of pixels per row for example Value 7874 Tag 257 ImageLength The number of rows of pixels in the image for example Value 7874 Tag 258 BitsPerSample Number of bits per component for example value 8 Tag 259 Compression Compression scheme used on the image data for example value 5 LZW Tag 262 Photo Interpretation The colour space of the image data for example value 3 RGB Palette Tag 270 ImageDescription A string that describes the subject of the image for example value 1 10 000 HP40NE Tag 273 StripOffsets For each strip the byte offset of that strip for example 1st 4 values 64827 64970 65113 65268 Tag 278 RowsPerStrip The number of rows in each strip for example value 1 Tag 279 StripByteCounts For each strip the numb
32. taining maximum image quality Northings See rectangular coordinates ee 1 10 000 Scale Raster technical specification annexe A v2 2 4 2009 Crown copyright Page 28 of 31 Oracle The relational database management system used for the 1 50 000 Scale Gazetteer Order A request from a customer for the supply of map data The scope of an order may be constrained by an agreement for a period licence service Origin The zero point in a system of rectangular coordinates Pixel In the 1 10 000 scale product a pixel is a single point represented by a square Points A pair of coordinates Raster data Attribute data expressed as an array of pixels with spatial position implicit in the ordering of the pixels Real world object The real world feature represented by a feature for example a building a fence a wood Rectangular coordinates Also known as x y coordinates and as eastings and northings These are two dimensional coordinates that measure the position of any point relative to an arbitrary origin on a plane surface for example a map projection a digitising table or a VDU screen Stipple Used to produce light or dark shading for example building water fill this is dependent on spacing of the dots the denser the dots the darker the effect String A set of items that can be arranged into a sequence according to a rule Supply format The file format in which the data is supplied to the customer Tag Ta
33. tandard when plotted or displayed at scale This is shown in figure 4 below Before 1 10 000 scale edgematch After 1 10 000 scale edgematch has taken place Figure 4 Edgematching A list of all of the tiles that comprise national cover is updated every month on the product page This downloadable table provides the date of last revision for every tile in the product EM VL V o OEEEEEUL ALEIPeIIOGo 1 10 000 Scale Raster user guide chapter 7 v2 2 4 2009 Crown copyright Page 12 of 31 Chapter 8 Table 1 Definitions of data measures Data measure Data measures Ordnance Survey measures the data in its products in one or more of the ways set out in table 1 below Completeness Presence and Logical consistency Positional accuracy Temporal accuracy Thematic accuracy attribute accuracy absence of features against the specified data content Degree of adherence to logical rules of data structure attribution and relationships Accuracy of the position of features Accuracy of temporal attributes and temporal relationships of features Classification of features and their attributes Omission Features representing objects that conform to the specified data content but are not present in the data Commission Features representing objects that do not conform to the specified data content but are present in the data Conceptual consistency How closely the data follows the conc
34. the Customer Service Centre please see contact details You should check the terms and conditions with us before using the data It is also the responsibility of the holder of the digital map data to ensure that any plotted or printed output contains the required copyright and database acknowledgements in a conspicuous position Trademarks Ordnance Survey and the OS Symbol are registered trademarks of Ordnance Survey the national mapping agency of Great Britain Acrobat Reader and Adobe are registered trademarks of Adobe Systems Incorporated Intel is a registered trademark of Intel Corporation Motorola is a registered trademark of Motorola Inc Oracle is a registered trademark of Oracle International Corporation Unisys is a registered trademark of Unisys Corporation UNIX is a registered trademark of X Open Company Ltd Windows is a registered trademark of Microsoft Corporation Back up provision of the product You are advised to copy the supplied data to a back up medium Using this guide The documentation is supplied in portable document format PDF only Free Adobe Acrobat Reader software which displays the guide incorporates search and zoom facilities and allows you to navigate within Hyperlinks are used to navigate between associated parts of the guide and to relevant Internet resources by clicking on the blue hyperlinks and the table of contents If you are unfamiliar with any words or terms used and require clarif
35. tract and this guide then the terms of your customer contract prevail If you or your organisation has not signed a valid current customer contract then you are not entitled to use the product Purpose and disclaimer This guide is provided for guidance only and does not constitute any warranty representation undertaking commitment or obligation express or implied about the product or its suitability for any particular or intended purpose Any warranties representations undertakings commitments and obligations given by Ordnance Survey about the product and or its suitability for any particular or intended purpose are set out in your customer contract It is your responsibility to ensure that this product is suitable for your intended purpose Ordnance Survey does not accept any liability whether for breach of contract negligence or otherwise for any loss or liability you or any third party may suffer in relying on this guide and any guidance suggestion advice or explanation provided in it Any liability that Ordnance Survey has to you in relation to the product its supply use accuracy data supplied functionality or any other liability arising out of or in connection with the product is limited as set out in your customer contract We may change the information in this guide at any time without notice We do not accept responsibility for the content of any third party websites referenced or accessed in or through this guide any co
36. ts or feedback in the space below We will acknowledge receipt of your form within three 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 1 10 000 Scale Raster Product Manager Ordnance Survey Romsey Road SOUTHAMPTON SO16 4GU If you wish to return it by fax please dial 023 8079 2615 Any personal information that you supply with this report form will be used by Ordnance Survey only in the improvement of its products and services It will not be made available to third parties 0 00 o NMENENENENMNMEEERH ERIREREEIEMMMMMMNMMNMN MN 1 10 000 Scale Raster user guide annexe C v2 2 4 2009 Crown copyright Page 16 of 31 1 10 000 Scale Raster Technical specification Contents Section Page no Introduction 18 Purpose of this specification and disclaimer eee 18 Copyright in this specification ssssssssssseeseeneeneeeene nennen nnns 18 Chapter 1 SPS CUIS AULD me manu AE 19 Chapter 2 LS Ch o e cans 20 Chapter 3 ISS OFCTONONICUING PER A A A A LL 21 Chapter 4 Image file directory TIFF errorae erp nautae ntu nutu naaa 22 Jl cp c MEME E 23 Colour image directory TIFF sssssssssssssssseseeeneee eene tnnt 23 Black and white image directory
37. ure for example School as shown on the 1 10 000 Scale Raster map Definitive name The name as shown on the 1 10 000 Scale Raster map Digital Data that is expressed as numbers digits in computer readable form Digital update The supply of digital data to a customer at a predetermined interval of time if when the time interval has elapsed the map has reached an agreed level of change Direct sale A direct transaction between Ordnance Survey and a customer Distinctive name A text feature that form s a name that distinguishes it from other text features of the same type for example Millbrook School Dots per inch dpi The resolution or fineness of a raster image Eastings See rectangular coordinates ECW The Enhanced Compressed Wavelet ECW raster image compression software has been designed to compress display serve on the Internet and distribute raster The key characteristic of wavelet based compressions is that it is able to preserve a very good quality of the image with high compression ratios This compression format uses mathematical wavelet transformations to store image data rather than storing a grid of values for image pixels such as TIFF or other common formats This allows a great reduction in the amount of disk space it takes to store large images whilst retaining nearly all the original image s quality colour and detail ECW is a lossy format meaning that some information is lost when the image is
38. v2 2 4 2009 Crown copyright Page 30 of 31 Annexe B Other minor detail that is not included on 1 10 000 Scale Raster product e Airfield identification mark runway approach lights signal square e Anchorage points for radio and television masts e Bollards capstans dolphins mooring posts rings e Bus shelter e Cranes not travelling hoists e Drinking fountain pump hydrant water point e Electricity pillar e Hopper e Inspection pit e Icehouse e Letter box e Lighting tower e Pavement pecks e Permanent way pecks along railways e Railway detail switch slip buffer retarder signal light loading gauge mail pick up signal post water point e Ramp e Saluting battery gun e Sand drag e Water taps troughs Electricity transmission lines carried on single poles are shown in 1 10 000 scale basic areas mountain and moorland only Those extending into other geographic areas are terminated at suitable points of detail or at a pole in a surveyed position either just inside or outside of the basic area The underground portions of the railways in London are not shown and stations whose entrances appear at surface level are described as Sta LL EN 1 10 000 Scale Raster technical specification annexe B v2 2 4 2009 Crown copyright Page 31 of 31
39. ystem for all products takes the form of a British National Grid system namely OSGB36 Data format Data format takes the form of the name of the format or formats the product is supplied in Frequency of updates Frequency of update takes the form of a stated period of time Distributor contact details Distributor contact details include with postal address phone number fax number email address and website Data originator Given as the company having primary responsibility for the intellectual content of the data source in all cases this will be Ordnance Survey Other metadata available includes keywords start date of data capture access constraints use constraints level of spatial data supply media and presentation details 0 0 1 10 000 Scale Raster user guide annexe B v2 2 4 2009 Crown copyright Page 15 of 31 AnnexeC Product and service performance report form Ordnance Survey welcomes feedback from its customers about 1 10 000 Scale Raster If you would like to share your thoughts with us please print a copy of this form and when completed post or fax it to the address below Bol el a 10 ENTM UN UTI a n oe ok Bee VERE Oe VETTE Organisat sers srian Adressi eae aa a a a a a a aaa aa a aa Quotation or order reference ssssssessseseeenee eene enenehhehes EAA AERA inse sinn EEAAEEEEAA sida dass sas AAEE nasa sss AEEE RAEE E Ennn Please record your commen
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