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Going Back in Time

Going Back in Time. Hamilton County Auditors Office Transfer & Mapping Department Nick Christiansen Barton Griesenauer David Cetola. Going Back in Time. Parcel Mapping 112,000+ parcels in the county 3,900+ Plats recorded since 1827

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Going Back in Time

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  1. Going Back in Time Hamilton County Auditors Office Transfer & Mapping Department • Nick Christiansen • Barton Griesenauer • David Cetola

  2. Going Back in Time Parcel Mapping • 112,000+ parcels in the county • 3,900+ Plats recorded since 1827 • 94,000+ (83%) Parcels in Hamilton County are from recorded subdivisions

  3. Plats • Plat – “survey diagram, drawn to scale, of the legal boundaries and divisions of a tract of land.” * • Plat – recorded survey that designates an area of land into subdivision lots. • All subsequent transfers will be referenced to this plat. * Dictionary of GIS Terminology, Heather Kennedy, ed., ESRI Press, Redlands, CA, 2001

  4. Plat

  5. Going Back in Time Parcels & Plats since 2000 • Average 4500 new platted parcels per year • Average 200 new plats per year • 16,000+ transfer deeds per year

  6. Software Tools Bentley Geographics • All database and linework maintenance • Adjoiners • Parcel data ArcGIS • Any analysis, hyperlinks, etc. • Custom maps • Bridges Bentley (parcel) data & MVP (tax) data MVP • Tax System

  7. Going Back in Time History of GIS in Transfer & Mapping Department • Converted to GIS in 1998 • Parcel was only intelligent layer • Plats & subdivision were represented on GIS with non-intelligent lines & text

  8. Real Time Dilemmas • Missing Real Estate Transfers • Incorrect Real Estate Transfers • Time consuming

  9. Two deeds

  10. Short Comings Plat Text • Missing text • Incomplete text • Tell you subdivision name but not section

  11. Shortcomings Tax system was incomplete • Subdivision code incorrect or not even present • Wrong section designated • Lot Numbers were inconsistent • Gives limited plat information (recorders office location not noted)

  12. Recorders Index difficult to figure out

  13. Recorders Index difficult to figure out

  14. Creating a Plat Layer in GIS Create database March 2002 (Larry Stout) Data from the plat & recording information • Designation name • Plat date • Instrument number • Plat cabinet • Owner/developer • Number of lots • Acreage • Engineer

  15. Creating a Plat Layer in GIS Data from MVP Tax • Tax year • Tax ID • Map number • Block number • MVP subdivision name

  16. Creating a Plat Layer in GIS Creating Plat Intelligence • Pulling plats from plat cabinet • Started database at PC 2 Slide 274 (March 2002) back to PC 1 Slide 1 (January 1989) • 63,000 ~67% platted parcels • 2642 plats in database • Using scanned plats from Surveyor & Recorder • 31,000 parcels (33% platted parcels) 1330 plats • Include original town plats

  17. Creating a Plat Layer in GIS Refining tax system database • Validate MVP subdivision codes • Consolidate subdivision codes • Assign correct subdivision codes to parcels • Create subdivision layer in GIS • Validate MVP block value • This correlates plat section number • Update parcel lot numbers

  18. Subdivision Code

  19. Creating a Plat Layer in GIS Populating a database in GIS • Linking parcel & plat • Using Primary Key from Plat Layer • Adding Path to the Excel Write up • Populate Common Area Name in Parcel layer • Adding Path to Scanned Plats

  20. Benefits • Subdivision maps • QC’ed tax system • Query plat database • Linked scanned plats to plat database • Linked writeup to plat database • Analyze development in Hamilton County by tax year

  21. Benefits Subdivision Maps

  22. Benefits QC’ed tax system • Tax system works more efficiently • Reduced questions for staff

  23. Benefits Query plat database • Answers questions for consultants, engineers, other depts, & public • Create list of parcels based on set parameters

  24. Benefits Link scanned plats to plat database

  25. Benefits Linked writeup to plat database

  26. Benefits Analyze development in Hamilton County by tax year

  27. Platted Parcels 1827-1889 1890-1946 1947-1971 1972-1987 1988-1998 2000-2007

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