11

Going Back in TimeGoing Back in Time

Hamilton County Auditors OfficeHamilton County Auditors OfficeTransfer & Mapping DepartmentTransfer & Mapping Department

• Nick ChristiansenNick Christiansen• Barton GriesenauerBarton Griesenauer• David CetolaDavid Cetola

22

Going Back in TimeGoing Back in Time

Parcel MappingParcel Mapping • 112,000+ parcels in the county112,000+ parcels in the county• 3,900+ Plats recorded since 18273,900+ Plats recorded since 1827• 94,000+ (83%) Parcels in 94,000+ (83%) Parcels in

Hamilton County are from Hamilton County are from recorded subdivisions recorded subdivisions

33

PlatsPlats

• Plat – “survey diagram, drawn to Plat – “survey diagram, drawn to scale, of the legal boundaries and scale, of the legal boundaries and divisions of a tract of land.” divisions of a tract of land.” **

• Plat – recorded survey that Plat – recorded survey that designates an area of land into designates an area of land into subdivision lots. subdivision lots. • All subsequent transfers will be All subsequent transfers will be

referenced to this plat. referenced to this plat.

* * Dictionary of GIS TerminologyDictionary of GIS Terminology, Heather Kennedy, ed., ESRI Press, Redlands, CA, , Heather Kennedy, ed., ESRI Press, Redlands, CA, 20012001

44

PlatPlat

55

Going Back in TimeGoing Back in Time

Parcels & Plats since 2000Parcels & Plats since 2000• Average 4500 new platted Average 4500 new platted

parcels per yearparcels per year• Average 200 new plats per Average 200 new plats per

yearyear• 16,000+ transfer deeds per 16,000+ transfer deeds per

yearyear

66

77

Software ToolsSoftware Tools

Bentley GeographicsBentley Geographics• All database and linework maintenance All database and linework maintenance • AdjoinersAdjoiners• Parcel dataParcel data

ArcGIS ArcGIS • Any analysis, hyperlinks, etc. Any analysis, hyperlinks, etc. • Custom mapsCustom maps• Bridges Bentley (parcel) data & MVP (tax) dataBridges Bentley (parcel) data & MVP (tax) data

MVPMVP• Tax SystemTax System

88

Going Back in TimeGoing Back in Time

History of GIS in Transfer &History of GIS in Transfer &

Mapping DepartmentMapping Department• Converted to GIS in 1998 Converted to GIS in 1998 • Parcel was only intelligent layerParcel was only intelligent layer• Plats & subdivision were Plats & subdivision were

represented on GIS with non-represented on GIS with non-intelligent lines & text intelligent lines & text

99

Real Time DilemmasReal Time Dilemmas

• Missing Real Estate TransfersMissing Real Estate Transfers• Incorrect Real Estate Transfers Incorrect Real Estate Transfers • Time consuming Time consuming

1010

Two deedsTwo deeds

1111

1212

1313

Short ComingsShort Comings

Plat TextPlat Text • Missing textMissing text• Incomplete text Incomplete text

• Tell you subdivision name Tell you subdivision name but not sectionbut not section

1414

1515

ShortcomingsShortcomings

Tax system was incompleteTax system was incomplete• Subdivision code incorrect or not Subdivision code incorrect or not

even presenteven present• Wrong section designated Wrong section designated • Lot Numbers were inconsistentLot Numbers were inconsistent• Gives limited plat information Gives limited plat information

(recorders office location not noted)(recorders office location not noted)

1616

Recorders Index difficult to figure outRecorders Index difficult to figure out

1717

Recorders Index difficult to figure outRecorders Index difficult to figure out

1818

1919

Creating a Plat Layer in GISCreating a Plat Layer in GIS

Create database March 2002 (Larry Stout)Create database March 2002 (Larry Stout)Data from the plat & recording informationData from the plat & recording information

• Designation name Designation name • Plat datePlat date• Instrument numberInstrument number• Plat cabinetPlat cabinet• Owner/developerOwner/developer• Number of lotsNumber of lots• AcreageAcreage• EngineerEngineer

2020

Creating a Plat Layer in GISCreating a Plat Layer in GIS

Data from MVP TaxData from MVP Tax• Tax yearTax year• Tax IDTax ID• Map numberMap number• Block numberBlock number• MVP subdivision nameMVP subdivision name

2121

2222

2323

Creating a Plat Layer in GISCreating a Plat Layer in GISCreating Plat Intelligence Creating Plat Intelligence • Pulling plats from plat cabinetPulling plats from plat cabinet

• Started database at PC 2 Slide 274 (March 2002) Started database at PC 2 Slide 274 (March 2002) back to PC 1 Slide 1 (January 1989)back to PC 1 Slide 1 (January 1989)

• 63,000 ~67% platted parcels 63,000 ~67% platted parcels • 2642 plats in database2642 plats in database

• Using scanned plats from Surveyor Using scanned plats from Surveyor & Recorder & Recorder

• 31,000 parcels (33% platted parcels) 1330 plats31,000 parcels (33% platted parcels) 1330 plats• Include original town platsInclude original town plats

2424

Creating a Plat Layer in GISCreating a Plat Layer in GIS

Refining tax system databaseRefining tax system database• Validate MVP subdivision codesValidate MVP subdivision codes

• Consolidate subdivision codesConsolidate subdivision codes• Assign correct subdivision codes to Assign correct subdivision codes to

parcelsparcels• Create subdivision layer in GISCreate subdivision layer in GIS

• Validate MVP block valueValidate MVP block value• This correlates plat section numberThis correlates plat section number

• Update parcel lot numbersUpdate parcel lot numbers

2525

Subdivision CodeSubdivision Code

2626

Creating a Plat Layer in GIS Creating a Plat Layer in GIS

Populating a database in GISPopulating 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 Populate Common Area Name in

Parcel layerParcel layer• Adding Path to Scanned PlatsAdding Path to Scanned Plats

2727

BenefitsBenefits

• 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 Analyze development in Hamilton

County by tax yearCounty by tax year

2828

BenefitsBenefitsSubdivision MapsSubdivision Maps

2929

BenefitsBenefitsQC’ed tax systemQC’ed tax system

• Tax system works more efficientlyTax system works more efficiently• Reduced questions for staffReduced questions for staff

3030

BenefitsBenefitsQuery plat databaseQuery 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

3131

BenefitsBenefitsLink scanned plats to plat databaseLink scanned plats to plat database

3232

BenefitsBenefitsLinked writeup to plat databaseLinked writeup to plat database

3333

BenefitsBenefits Analyze development in Hamilton Analyze development in Hamilton

County by tax yearCounty by tax year

3434

Platted Parcels

1827-1889

1890-1946

1947-1971

1972-1987

1988-1998

2000-2007