1 Going Back in Time Hamilton County Auditors Office Hamilton County Auditors Office Transfer & Mapping Department Nick ChristiansenNick Christiansen Barton GriesenauerBarton Griesenauer David CetolaDavid Cetola

2 Going Back in Time Parcel Mapping Parcel Mapping 112,000+ parcels in the county112,000+ parcels in the county 3,900+ Plats recorded since 18273,900+ Plats recorded since ,000+ (83%) Parcels in Hamilton County are from recorded subdivisions94,000+ (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 – “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.Plat – recorded survey that designates an area of land into subdivision lots. All subsequent transfers will be referenced to this plat.All subsequent transfers will be referenced to this plat. * Dictionary of GIS Terminology, Heather Kennedy, ed., ESRI Press, Redlands, CA, 2001

4Plat

5 Going Back in Time Parcels & Plats since 2000 Parcels & Plats since 2000 Average 4500 new platted parcels per yearAverage 4500 new platted parcels per year Average 200 new plats per yearAverage 200 new plats per year 16,000+ transfer deeds per year16,000+ transfer deeds per year

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7 Software Tools Bentley Geographics All database and linework maintenanceAll database and linework maintenance AdjoinersAdjoiners Parcel dataParcel dataArcGIS Any analysis, hyperlinks, etc.Any analysis, hyperlinks, etc. Custom mapsCustom maps Bridges Bentley (parcel) data & MVP (tax) dataBridges Bentley (parcel) data & MVP (tax) dataMVP Tax SystemTax System

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

9 Real Time Dilemmas Missing Real Estate TransfersMissing Real Estate Transfers Incorrect Real Estate TransfersIncorrect Real Estate Transfers Time consumingTime consuming

10 Two deeds

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13 Short Comings Plat Text Missing textMissing text Incomplete textIncomplete text Tell you subdivision name but not sectionTell you subdivision name but not section

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

16 Recorders Index difficult to figure out Recorders Index difficult to figure out

17 Recorders Index difficult to figure out

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19 Creating a Plat Layer in GIS Creating a Plat Layer in GIS Create database March 2002 (Larry Stout) Data from the plat & recording information Designation nameDesignation name Plat datePlat date Instrument numberInstrument number Plat cabinetPlat cabinet Owner/developerOwner/developer Number of lotsNumber of lots AcreageAcreage EngineerEngineer

20 Creating a Plat Layer in GIS Data from MVP Tax Tax yearTax year Tax IDTax ID Map numberMap number Block numberBlock number MVP subdivision nameMVP subdivision name

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23 Creating a Plat Layer in GIS Creating Plat Intelligence Pulling plats from plat cabinetPulling plats from plat cabinet Started database at PC 2 Slide 274 (March 2002) back to PC 1 Slide 1 (January 1989)Started database at PC 2 Slide 274 (March 2002) back to PC 1 Slide 1 (January 1989) 63,000 ~67% platted parcels63,000 ~67% platted parcels 2642 plats in database2642 plats in database Using scanned plats from Surveyor & RecorderUsing scanned plats from Surveyor & Recorder 31,000 parcels (33% platted parcels) 1330 plats31,000 parcels (33% platted parcels) 1330 plats Include original town platsInclude original town plats

24 Creating a Plat Layer in GIS Refining tax system database Validate MVP subdivision codesValidate MVP subdivision codes Consolidate subdivision codesConsolidate subdivision codes Assign correct subdivision codes to parcelsAssign correct subdivision codes to parcels Create subdivision layer in GISCreate subdivision layer in GIS Validate MVP block value Validate MVP block value This correlates plat section numberThis correlates plat section number Update parcel lot numbersUpdate parcel lot numbers

25 Subdivision Code

26 Creating a Plat Layer in GIS Populating a database in GIS Linking parcel & platLinking parcel & plat Using Primary Key from Plat LayerUsing Primary Key from Plat Layer Adding Path to the Excel Write upAdding Path to the Excel Write up Populate Common Area Name in Parcel layerPopulate Common Area Name in Parcel layer Adding Path to Scanned PlatsAdding Path to Scanned Plats

27 Benefits Subdivision mapsSubdivision maps QC’ed tax systemQC’ed tax system Query plat databaseQuery plat database Linked scanned plats to plat databaseLinked scanned plats to plat database Linked writeup to plat databaseLinked writeup to plat database Analyze development in Hamilton County by tax yearAnalyze development in Hamilton County by tax year

28Benefits Subdivision Maps

29 Benefits QC’ed tax system Tax system works more efficientlyTax system works more efficiently Reduced questions for staffReduced questions for staff

30Benefits Query plat database Answers questions for consultants, engineers, other depts, & publicAnswers questions for consultants, engineers, other depts, & public Create list of parcels based on set parametersCreate list of parcels based on set parameters

31Benefits Link scanned plats to plat database

32Benefits Linked writeup to plat database

33Benefits Analyze development in Hamilton County by tax year Analyze development in Hamilton County by tax year

34 Platted Parcels