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Using CAD Parcel data with the Local Government Solution
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Using CAD Parcel data with the Local Government Solution

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  1. July 25, 2012 Using CAD Parcel data with the Local Government Solution Chris Buscaglia & Amir Bar-Maor

  2. CAD Parcel Data Characteristics Computer Assisted DRAFTING • File based and static • Usually not spatially referenced • Attribution as floating text (annotation) • Line based  overshoots & undershoots • Contains unnecessary geometries (map elements) • Layer structure is not consistent • Does not contain Tax Parcels • Designed for drafting

  3. Ground to Grid Correction • Ground: the measurements as they are captured by the surveyor on the ground. The direction might be relative to several definitions of north. • Grid: a projected coordinate system on the ellipsoid. E.g.: State plane • Ground to Grid Correction: scale & rotation

  4. CAD Integration Methods • Method 1: The Ad Hoc Method • Method 2: The Systematic Method

  5. The Ad Hoc Method Ad hoc steps Add CAD Data Select Lines Copy & Paste Clean & Build Join Attribute Parcels Ground to Grid

  6. The Ad Hoc Method When should I use it? • With small datasets (less than 1,000 lines) because: • Hard to fix errors on a large dataset • Hard to join a large dataset • Not limited to CAD lines Attention: Measurements are calculated during construction (ground)  do not georeferenced the CAD file if it is in ground

  7. Ad Hoc Method Chris Buscaglia DEMO

  8. The Ad Hoc Method Pros • Easy • Fast • Good for a small dataset (few parcels) • Ability to manually correct the COGO dimensions for each line

  9. The Ad Hoc Method Cons • Limited to a few parcels (1,000 lines) • Might be time consuming to fix many line errors • Line category has to be set manually • Need to set parcel type and name manually … It might be just as fast to re-COGO

  10. The Systematic Method Systematic Method Steps for a subdivision Copy Lines to Staging GDB add COGO Attributes Filter Out Unnecessary lines Use Topology to Clean Lines Calculate COGO Import Parcel Names as Annotation Create Polygons Prepare Line Attributes Separate Lines by Parcel Type Attribute Polygons Create Topology & Import Subdivision As Unjoined Import & Join Lot Parcels Join Subdivision

  11. The Systematic Method Why use this method • Large datasets • QA and analyze the data in a staging environment • Preserves COGO-ed dimension • Efficient attribution for parcel names • Ability to improve geometry using geoprocessing tools and Add-ins (e.g. curves) • Similar to a migration process • Can be streamlined using a geoprocessing model

  12. Systematic Method Chris Buscaglia DEMO

  13. The Systematic Method Pros • Captures parcel attributes • Can be automated and streamlined • Scalable—Can process thousands of parcels at a time

  14. The Systematic Method Cons • Involves more steps • Not cost effective for only a few parcels

  15. Methods Comparison

  16. Why Maintain Your Measurements (COGO)? • Ability to use labels or feature linked annotation. • Eliminate the need to go to the clerk's office to get legal dimensions • QA the data you receive: misclosures, rotation… • Maintain accuracy and run a meaningful least squares analysis (LSA). • Stated Area is calculated from COGO. • Misclosure is stored and based on COGO. • Categorize your lines correctly: boundary, road frontage…

  17. Best Practices • Use a digital submission standard • Update the pasted geometry with the record values

  18. Road Ahead: 10.1 SP1 Automated workflows for maintaining Parcels

  19. 10.1 SP Automated Workflows Parcel Workflows • 10.1 SP1 – even easier, more streamlined • LGIM enabled Parcel Fabric available with the core ArcGIS system • Workflows available with the core ArcGIS system, upgrade available at 10.1 SP1

  20. Road Ahead 10.1 SP1 Amir Bar-Maor DEMO

  21. UC Presentations Sessions to attend Technical Workshops Editing Parcels with the Local Government Information Model Thursday, 8:30 - 9:45 Demo Theaters Creating a Tax Map using the Local Government Solution Thursday, 11:00 – 11:30

  22. Steps to evaluate UC sessions • My UC Homepage > “Evaluate Sessions” • Choose session from planner OR • Search for session www.esri.com/ucsurveysessions

  23. Thank you for attending • Have fun at UC2012 • Open for Questions • Please fill out the evaluation: • www.esri.com/ucsessionsurveys • Offering ID: 381 / 661XXXX