More on Maintaining Parcels with ArcGIS 8.3
Contents
1. ArcInfo Workstation Commands ArcGIS Equivalent ADDCOGOATT Create COGO fields in ArcCatalog BREAKLINE Use the Proportion command on the Advanced Editing toolbar COGOINVERSE Select the Inverse command on the Advanced Editing toolbar CONSTANTS Choose Editor gt Options from the Editor toolbar and click on the Units tab in the Edi tor Options dialog box Use the Ground to Grid correction on the Units tab CURVE Use the End Point Arc tool on the Sketch palette followed by the Inverse command to set the COGO attribute values Choose ArcTools in the Sketch palette followed by the Inverse command so that COGO CURVE3PT i attribute values are assigned Choose Editor gt Options from the Editor toolbar and click on the Units tab in the Edi FORMAT i i tor Options dialog box Use the Traverse dialog box with a single course or the Sketch tool with the context menu choice for Direction Length with the Units in the Editor Options dialog box and LAYOUT i choose an appropriate option such as Quadrant bearing Use the Inverse command to set the attribute values Any of the several editing construction tools that construct a two point line using two LINE2PT r i specified points PROPORTION Use the Proportion command on the Advanced Editing toolbar SETREFERENCE Choose Editor gt Options from the Editor toolbar and click on the Units tab in the Edi tor Options dialog box STATUSCOGO Choose Editor gt Options from the Editor toolbar and click on the2. though both tasks can be used to create new features the Create 2 Point Line Feature Edit task will create individual line features for each course 1 e segment entered and will automatically assign the appropriate COGO attribute values The Create New Feature task only creates one feature and will not assign COGO attributes Table 1 lists other common ArcInfo Workstation COGO commands with their ArcGIS equivalents The ArcInfo Workstation commands listed in Table 2 are available as Developer Samples that can be downloaded from ArcObjects On line Go to support esri com and choose For Developers gt ArcObjects Online As with ArcInfo Workstation COGO com mands in ArcGIS should be used to update line features while maintaining COGO attributes To split a line use the Proportion command so that COGO attributes will be automatically updated Using the Split command or tool will not update COGO attributes Using Construction Layers In ArcInfo Workstation new features can be snapped to features in another coverage or feature class but only one coverage and one feature class can be edited at a time ArcGIS allows multiple feature classes in the same da tabase to be edited at the same time This func tionality lets users take advantage of Construc tion layers that can be used to hold temporary point line or polygon data Features added to Construction layers can be used either as a reference for new features being added or as
3. 3 Click on the node and hold down the left mouse button to drag the node to its new loca tion Running the Validate command after com pleting edits in ArcGIS identifies topological errors but this step is not required to have valid polygons because polygon topology is never lost in ArcGIS Although validation can be done once right before the end of an editing session it does not have to be done each time polygons are edited Comparing the process for splitting a parcel by traversing new line work across the center of the parcel provides another example of work flow differences In ArcInfo Workstation this process again requires BUILD or CLEAN 1 Set EDITFEATURE to ARC 44 ArcUser January March 2004 Parcel 13 18 353 006 will be split by traversing new line work between the two magenta nodes The lines that will be added are shown with dashes In ArcGIS add the new lines and use the Construct Features command to split the parcel 2 Execute the TRAVERSE command to enter and adjust the new line 3 Verify that the original label point is located in the correct half of the polygon 4 Run BUILD or CLEAN to regenerate the polygons In ArcGIS splitting this polygon would involve 1 Setting the Target Layer to Parcel Lines and the Task to Create 2 Point Line Features 2 Executing the Traverse command to enter and adjust the new lines 3 Setting the Target layer to Parcels 4 Executing the Construct Features comm
4. Units tab in the Edi tor Options dialog box Choose the Traverse tool from the Advanced Editing toolbar right click on the Traverse TRAVRST i dialog box and choose Load from File Choose the Traverse tool from the Advanced Editing toolbar right click on the Traverse TRAVSAV l dialog box and choose Save to File Table 1 Equivalent ArcGIS commands Arcinfo Workstation Commands Developer Sample CULDESAC Go to Samples gt Coordinate Geometry gt COGOTools and choose the Direction Con straint sample This tool adds a custom Sketch context menu item Go to Samples gt Edit Commands and choose Offset Command to download a project OFFSET containing a button and an edit task that invokes a dialog for creating new features as offsets to the current geometry Go to Samples gt Edit Tools and choose the Widen Tool sample and install it as a but WIDEN ton on a toolbar Table 2 Functionality available as Developer Samples Continued on page 46 www esri com ArcUser January March 2004 45 More on Maintaining Parcels With ArcGIS 8 3 Continued from page 45 The Create 2 Point Line Feature Edit task creates this type of geometry This choice is listed in the Editor Task drop down box under Other Tasks Using the Create 2 Point Line Feature Edit task rather than the standard Create New Feature task maintains bearing and distance information as attributes for a line layer Al
5. More on Maintaining Parcels With ArcGIS 8 3 By Larry Young ESRI ArcGIS Editor Team Editor s note This is the second in a two part series that discusses how typical parcel maintenance tasks in ArcInfo Workstation are accomplished in ArcGIS 8 3 The first install ment which appeared in the October Decem ber 2003 issue of ArcUser described how ArcGIS handles topology coordinate geome try COGO text and annotation This article compares work flows in ArcInfo Workstation and ArcGIS provides additional information on the use of COGO data and shows how Construction layers can be used when adding new features Comparing Work Flows With ArcGIS the work flows associated with maintaining parcel data and topology have evolved When performing parcel mainte nance in ArcInfo Workstation all line work is usually done first because it will suspend polygon topology The BUILD or CLEAN commands are then run to regenerate the poly gons and reestablish topology For example assuming the coverage has node attributes the process to update a parcel corner in ArcInfo Workstation is as follows 1 Set the EDITFEATURE to NODE 2 Select the node 3 Move the node by pointing to the original location and then the new location 4 Run BUILD or CLEAN to regenerate polygons In ArcGIS the work flow for performing the same tasks is similar but more flexible 1 Activate the Topology Edit tool 2 Click on the node to select it
6. a way to examine how a new feature might fit into the parcel fabric without actually insert ing that feature into the parcel layer Here are some scenarios in which Construction layers can be used advantageously e A set of traverse courses that lead to the be ginning of the parcel the user is trying to enter The setup courses can be added as a feature in a Construction line layer so that the start point for the actual traverse for the parcel or subdivision is snapped to the endpoint of the Construction feature e New parcel deed data is being incorporated into an existing database The new line work for the new parcel will require adjustments to the existing land base so that the corners and edges match If a Construction layer is 46 ArcUser January March 2004 234 97 275 636 9 iil 43 19 200 028 00 181 93 200 101 43 19 200 003 on a N 9 200004 43 49 200 038 10 32 725 04 872 95 R R Splitting a parcel based on a new deed can be more easily accomplished by initially putting the new lines shown in cyan into a Construction layer so the existing land base can be adjusted to the new lines without introducing unnecessary topology nodes during the process used the existing land base can be adjusted and intermediate Validates performed without creating unnecessary topology nodes When adding a Construction layer to a database make sure the Construction layer and the lay
7. and to perform the split 1 e generate two parcels with the same attributes from the original parcel Some slight variation in this ArcGIS work flow might occur if it is necessary to maintain COGO attributes Maintaining Line Work The need to maintain line work so that COGO attributes symbolization and other charac teristics are preserved is nearly universal In ArcGIS lines and parcels are edited at es sentially the same time using the Topology Edit tool Located on the Topology toolbar the To pology Edit tool lets the user select and move topology elements e g nodes and edges Rather than using the Edit tool which edits the geometry of individual features the Topology Edit tool ensures that all the features lines polygons and points in the topology that share geometry will be updated simultane ously The Shared Features dialog box also lets the user specify features that should not be updated The Sketch tool can be used with the Re shape Edge task to update the boundaries or features that share the geometry of a selected topology edge This functionality allows up dating of multiple line and or polygon features simultaneously while keeping all the geom etries coincident Comparing COGO Commands Only single part or single part segment poly lines that are constructed of two point lines or curves can be supported by COGO attributes www esri com Hands On
8. b th dialog f t feat ffsets to th t pe ee operations bring up the same dialog for creating new features as offsets to the curren ee geometry The current geometry is the selected line feature only one can be selected Parcel Data Model A sample dataset can be leh in the case of the command button or the sketch geometry in the case of the edit i Convert Graphics Command task For those that are familiar with COGO in workstation ArcInfo this tool offers the downloaded from the site and the ArcGIS F CurveConversion Command same options as the OFFSET command Those options are p l li h l d i de Symmetric Difference Command arcels online he ocumentation contains Bal Extend Command 1 End of the line geometry to start from P a l Ad Flip Command 2 Offset type user must select from the Connect Connect Ends Perpendicular the example work flows Editing n ArcMap Line Edit Toolbar and Points options The first 3 options are available when the target layer is a line capac layer while the final option Points is only available when the target layer is a the user manual that comes with ArcGIS also Wp EERE EET point layer The Connect option will generate new line features connected the R R Ste iii ppb 4 ic offset locations The Connect Ends option will do the same but also add new line contains information on editing 1n ArcGIS 8 3 argeted shared editing features between the start and end points of the line geometry with the Edit Ske
9. er that features will be copied to have the same attribute fields Also do not add the Construction layer to the topology because this will negate some of the functionality of the Construction layer Conclusion When migrating a land records database to ArcGIS remember that all the functionality available in ArcInfo Workstation exists in ArcGIS However some work flow restric tions have been removed which will allow further streamlining of the parcel maintenance process As with any other work flow modi fications creating prototype databases from sample coverages and testing different editing procedures will help determine what strate gies will be most suitable for an organization Prototypes should help answer all modeling questions before the migration process begins Some questions to consider may include Do I need to migrate all of my coverage fea ture classes to the geodatabase A general rule of thumb migrate only layers for which at tributes are actively maintained For example if regions are used to model parcels polygons will probably not need to be migrated What feature classes and rules should be in cluded in my topology The Parcel Data Model will provide some guidelines for determining these requirements and prototyping the data base should further resolve these issues Should annotation be feature linked In most cases the answer to this question is yes even though attribute linkages may not curre
10. ntly exist between annotation and the related fea tures Of course if street and subdivision fea tures are not being actively maintained in the parcel database annotation for these features can be added as nonfeature linked annotation classes It bears repeating that the answers to most modeling and editing questions can be answered through prototyping Be sure to adequately test database designs and potential editing work flows on databases before start ing a complete migration www esri com Hands On 3 ArcObjects Online Microsoft Internet Explorer F Fk 5 S e E T EO ee Developer Samples that can be Back gt G2 A Qsearch Gyravorites media lt 4 shy He S Y Address http arcobjectsonline esri com downloaded fi rom ArcObj ects Online ESRI Home Support amp Solutions Y supply functionality for the ArcInfo cObi t O li Workstation commands CULDESAC rc yects Uniine OFFSET and WIDEN Hide zal Locate Home ES get page url Quick Search Advanced I Coordinate Geometry a a Coordinate Geometry Start Page See teeth Offset Command ne COGOTools Additional information on parcel editing is D coco Utilities Creatad 5 22 2003 f PEO i Custom Object Inspectors Description available online by visiting support esri com Edit Commands Bee ee The Offset Command project contains a command button and an edit task Both and choosing Downloads gt Data Models gt dito tions
11. tch Context Menu corresponding offset points The Perpendicular option will generate new line The ESRI Virtual Campus esri campus com W Edit Tasks features as perpendiculars to the base line geometry at the specified offset M Area Select Task locations The Points option will generate new point features at the specified offers two online courses Creating and Edit Bel Calculate Contour Task offset locations SM Create Circle Task 3 Sort option The offset information specified will be used in the order entered in Ing Geodatabase Features for ArcEditor and a the dialog unless the Sort option is specified When the Sort option is selected Create Point at End of Sketch Task 5 2 s aoe Wa create Points Task n o an ite sorted in ascending order based on the specified ArcInfo and Creating and Editing Geodata istance down the base line Caa Sanse Port Ememan TAk 4 Alternative Distance option only available with the Edit Task When using the base Topology for ArcEditor and ArcInfo Cut Polygons Without Selection Task sketch option the user can specify an alternative distance for the geometry a Cut Task X defined by the sketch The specified offset information will then be proportioned 4 i gt based on the difference between the entered distance and the actual distance xl E jp Internet More Ways to Get Help in ArcGIS The help system for ArcGIS supplies much of its information on a context sensitive basis rather than
12. through looking up a command or dialog box using the index Longtime Arclnto Item Access Help By Pulldown menu command or Click on the What s This i e the tool in the Standard toolbar button toolbar then click on the item Launch context menu highlight the command and Context menu item users may not be familiar with this press SHIFT F1 style of help Here are some tips for E ee ee Click on the tool at the top of the dialog box then accessing context sensitive help in J click on the control ArcMap l az ihian Arcane ana ay Ee GR yen dent pleton foo hd th GR yer jori pirin pk ids Eee Ogee mex m aad go ee tl Deda l Ser o p m a l cer cta e ikeneen a efter ol Aaaa Eka Th tat Feet al Tati firra OOOO l iaia e err al al a a a Ude ahappere Ma Tora eter ately i rea partie ttn Deanar areae wa td hay y y k k o o H H G i F F Ta enia marien ler See i Ber lbt Dht AS 1 a To learn about a tool click on the What s This button then click on More information on how to fill in a dialog box can be accessed by the tool button or menu choice clicking on the What s This button and then clicking on the portion of the dialog box you want to learn about www esri com ArcUser January March 2004 47
Download Pdf Manuals
Related Search