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The South Australia Story

The South Australia Story. DCDB National Workshop Sydney 28 – 30 July 2010 Presented by Mauri Trinca. DCDB Graphical representation of the state’s cadastre First created in 1986 by digitising existing hard copy cadastral maps

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The South Australia Story

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  1. The South Australia Story DCDB National Workshop Sydney 28 – 30 July 2010 Presented by Mauri Trinca

  2. DCDB Graphical representation of the state’s cadastre First created in 1986 by digitising existing hard copy cadastral maps September 2009 after 2 year project moved maintenance to the ESRI Cadastral Editor package using ESRI 9.3 software with a number of additional service packs now included in 9.3.1 Not using full capacity of software at this stage

  3. Cadastral fabric contains: 920,000 land parcels 90,000 coordinated survey marks

  4. Survey Mark Maintenance Module • Also maintain: • Valuation (assessment) cadastre • Electoral boundaries • Local government boundaries • Suburb boundaries

  5. Statistics 9 staff 4000survey plans per year 15,000 new parcels created Property Cadastre has a corresponding number of new assessments mostly automatically created Approximately 15% are captured manually

  6. Cadastral boundaries of varying positional accuracy depending on the scale and reliability of source information and digitizing accuracy. • Contains some survey accurate data • Positional accuracy of DCDB boundary points: 28.5% > 5m • 64% 0.3m – 5 m • 7.5% <0.3m

  7. Tertiary Network – Survey Control Coordination of PSM’s placed on cadastral surveys commenced 1970’s – terrestrial, now mainly GPS Designated Survey Area (DSA) declared once coordinates in Survey Data Base Surveyors placing new PSM’s in DSA’s provide data to enable coordinates to be calculated

  8. PCPLANS Captures bearings, distances from surveys lodged in the LTO since early 1990’s Connection to coordinated PSM’s where exist 920,000 parcels in the cadastre 248,000 current surveyed parcels in PCPlans 218,600 are in DSA’s = 24% PCPlans coverage in DSA’s

  9. Spatial Improvement Project This project will : • Spatially improve the DCDB in urban and major rural Designated Survey Areas (DSA) to survey accurate level • Design new business processes for the lodgement and examination of cadastral survey plan data

  10. Project Approach Two key concepts for the project • Migration of existing PCPlans data • Back capture of cadastral survey plan data Three project phases • Pilot • Population • Business process design

  11. Pilot Objectives • Technical Environments July 2010 • Pilot Phase August 2010 • Project Plan Sept 2010 • PCPlans Strategy July 2011

  12. Anticipated Project Outcomes Based on analysis undertaken it is estimated that at completion of the Population Phase (if endorsed) • 70% of road boundaries in metropolitan DSA’s will be aligned to the tertiary network • 40% of parcels within metropolitan DSA’s will be at a survey accurate level

  13. Spatial Improvement: Example 1 • No PCPlans files exist for a target area • Back capture of parcels connected to survey marks • Spatial improvement occurs by joining DCDB parcels to survey accurate parcels

  14. Spatial Improvement: Example 2 • High proportion of PCPlans data in target area • Back capture of remaining parcels for full coverage • Spatial improvement creates fully survey accurate island block

  15. Issues • Impact of cadastral upgrade on users – vector shifts • Alignment of associated themes • Rural cadastre • Pastoral cadastre • CORS Networks • e-plan

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