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  1. NSW DCDB BOB DAVIS, Team Leader DCDB Update BILL MILLER, Team Leader DCDB Upgrade July 2010

  2. Initial capture commenced 1989 using Genamap software and was completed in1993. Best available data was used : CMA cadastral maps drawn from old parish maps and hand plotted plans ranging in scale from 1:2000 to 1:100 000 Crown town and village maps Digital data sourced from Sydney Water, Hunter District Water Board and Shoalhaven City Council Manual update and digital capture of hard copy maps was undertaken by a combination of private contractors and in house staff LPI Bathurst staff provided quality control of contractor captured data DCDB Update BACKGROUND

  3. DCDB Update CONTENT Fabric Layer The DCDB currently contains 4,135,300 “legal” fabric parcels • 3,055,200 lot parcels • 44,500 unidentified parcels • 1,017,600 road parcels • 18,000 water feature parcels

  4. DCDB Update CONTENT Corridor Layers The DCDB currently contains 902,000 corridor feature parcels • 875,900 road corridors • 5,100 railway corridors • 21,000 water feature corridors

  5. DCDB Update CONTENT Administrative Layers The DCDB contains 14 administrative layers • County • Federal Electoral Division • Land District • Lands Office • Local Aboriginal Land Council • Local Government Area • Mines Subsidence District • Miscellaneous Reserves • NPWS Reserve • Parish • Rural Land Protection District • State Electoral District • State Forest • Suburb

  6. DCDB Update UPDATE SOURCES • New plan registrations at LPI Sydney • Amendments from Crown Lands Division • Gazette notices, legislation and notification • New and amended data from external agencies • Corrections to DCDB identified both internally and by external agencies

  7. DCDB Update ACTIVITY BY UPDATE TYPE • Plan updates – 67% (43% subdivision updates, 57% non subdivision, e.g. compilation, strata) • Ad Hoc updates, corrections and/or modification of existing data - 16% • Corridor updates - 5% • Administrative boundary updates gazetted/notified or by legislation - 3% • Miscellaneous updates – 9%

  8. DCDB Update ACTIVITY BY JOB AND FEATURE COUNT • Average 26,000 jobs processed per year • Average 30,000 lot features added per year, with 147,000 lot features being modified • Average 68,000 road, railway and water features added/modified per year • Average 38,000 road centrelines added/modified • Average 420,000 plan lines added/modified per year • Average 740,000 “cadpoints” added/modified per year

  9. DCDB Update RESOURCES • ARC ESRI GIS software which was adopted in December 2004 is used to update the DCDB • ARC provides a job management system (JTX) which enables all jobs to be tracked by operator and job stage • Access to title data and plan images is provided through the Department’s “SIX” website • Imagery and/or topographic data is also imported where required • The process is managed by a Team Leader and 2 Supervisors, with 20 operators undertaking jobs allocated by LGA

  10. DCDB Update ACCURACY • Except where data has been upgraded the base data accuracy is derived from the accuracy of the original source documents, e.g . + or - 2 metres from 1:4000 maps, + or - 12.5 metres for 1:25000 maps etc • Generalisation caused by original map scale results in some boundary steps and bends being omitted from the data • Digital data used in original capture carries no accuracy as supplying organisations could not provide metadata • Unless the area has been upgraded, no accuracy metadata is stored against points or lines, rather the accuracy of the base data is referred to when needed

  11. DCDB Update UPDATE PROCESS • Plans registered at LPI Sydney are scanned and incorporated into job packets that are placed on the job queue that are accessed by update operators using JTX. • Where jobs are corrections or miscellaneous jobs the jobs are created by the operator. • Bearing and distance data is captured for “Survey” type jobs and stored for later access in the upgrade process. • The captured plan data is input using a ”fit to fabric” process except where gross errors outside of expected base data accuracy are found, when “Ad Hoc” updates are carried out to fix such problems

  12. DCDB Update UPDATE PROCESS(Continued) • The system imposes strict checks to ensure our cadastral business rules are adhered to in the “BUILD” stage and that topology is maintained in the “QA VALIDATE” stage • Completed jobs are then incorporated into the DCDB Maintenance data set in the “POST” stage • Data from the maintenance data base is posted to the delivery data base for distribution to clients


  14. DCDB Data Supply DCDB USE BY LGA



  17. DCDB Upgrade WHY UPGRADE • Conflicting accuracy with other datasets • Availability of a range of accurate imagery • Accurate GPS for positioning assets • Increased use of GIS applications

  18. DCDB Upgrade WHY A SINGLE CADASTRE • Eliminate duplication • Single source of reference • Consistent approach to upgrade • Incremental electronic updates • More than 150 potential clients

  19. DCDB Upgrade UPGRADE PROGRAM • LGA Based • Agency enters into a MOU • Agency commits to a Single Cadastre • Compelling or strategic reasons - internal and external • Available survey control, accurate plans and connections

  20. DCDB Upgrade CURRENT PROGRAM • Sydney Metropolitan • Sydney Water Completed 2007 • Spatial comparison of approximately 1.35 million polygons • 400,000 polygons upgraded to SWC position • Regional NSW • Cities • Towns and villages • 200,000 polygons upgraded • Rural NSW • Test 3,500 polygons

  21. DCDB Upgrade TARGET ACCURACY • Sydney Water AOI within 0.2 of SW position • Metro Areas • 0.5 metres is achievable with adequate survey control and plans • 0.3 is achievable with optimum survey control and plans • Urban Areas • 0.5 metres is achievable with adequate survey control and plans • 0.3 is achievable with optimum survey control and plans • Rural Areas • depends on control source • LPMA developing improved processes

  22. DCDB Survey Plan Content DCDB Upgrade

  23. Cadastral Upgrade 12.7% has Control 1.7% full Geometry

  24. All 750,000’s DPsBathurst Regional LGA

  25. Complete B&D capture Cadastral traverses Conflation DCDB Upgrade UPGRADEMETHOD

  26. Old Position

  27. Upgraded Position Cadastral Upgrade

  28. Cadastral Upgrade COMPLETE B&D CAPTURE

  29. Cadastral Upgrade CADASTRAL TRAVERSE

  30. CONFLATION Cadastral Upgrade Conflation

  31. Cadastral Upgrade IRRIGULAR SHIFTS

  32. DCDB Upgrade UPGRADE RESOURCES • ARC ESRI GIS – capture and manage data • ACRES - capture adjust and integrate data • Conflation - move DCDB to another target dataset • Upgrade Manager (CE) capture and adjust small areas • Team Leader and two Supervisors, with 10 operators

  33. DCDB Upgrade Survey Measurements + LSA 1890 Survey Plan CADASTRAL FABRIC Contractor, Council, LPMA Least Squares Adjustment of 1000s ofplans in one adjustment Survey Measurements + LSA 1995 Survey Plan Survey Measurements + LSA 2008 Survey Plan Observe how measurements change throughout the process. How important is it? DCDB Static Shape 2010 Plan Update New Title Fit to Fabric Alternate Plan Update New Title Fit DCDB fabric to Plan Readjust DCDB every update MILLIMETRE MADNESS

  34. DCDB Upgrade DCDB Overlaps Gaps Adjustment Job

  35. DCDB Upgrade Outside Boundary Locked Down Flexible Inside Boundary Buffer Polygons DCDB


  37. DCDB Upgrade MOVING ASSETS • Pipes, wires, planning etc • Shift vectors provided by LPMA • Software solutions • LPI Support • Contractor services

  38. DCDB Upgrade METADATA

  39. DCDB Upgrade PARTNERING TO ACCELERATE THE UPGRADE PROCESS • LPMA will provide free of charge: • Imagery • Access to SCIMS • Copies of plans • Access to CORS for an agreed period • Consultation with LPMA staff on upgrade strategies • Council might provide • Plan geometry • Upgraded cadastre • Survey • Imagery • Reconnaissance

  40. Cadastral Upgrade