Transcript Platted Parcels

Going Back in Time
Hamilton County Auditors Office
Transfer & Mapping Department
• Nick Christiansen
• Barton Griesenauer
• David Cetola
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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
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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
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Plat
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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
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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
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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 nonintelligent lines & text
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Real Time Dilemmas
• Missing Real Estate Transfers
• Incorrect Real Estate Transfers
• Time consuming
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Two deeds
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Short Comings
Plat Text
• Missing text
• Incomplete text
• Tell you subdivision name but not
section
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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)
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Recorders Index difficult to figure out
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Recorders Index difficult to figure out
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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
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Creating a Plat Layer in GIS
Data from MVP Tax
• Tax year
• Tax ID
• Map number
• Block number
• MVP subdivision name
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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
•
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31,000 parcels (33% platted parcels) 1330 plats
Include original town plats
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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
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Subdivision Code
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Creating a Plat Layer in GIS
Populating a database in GIS
• Linking parcel & plat
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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
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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
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Benefits
Subdivision Maps
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Benefits
QC’ed tax system
• Tax system works more efficiently
• Reduced questions for staff
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Benefits
Query plat database
• Answers questions for consultants, engineers, other depts, & public
• Create list of parcels based on set parameters
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Benefits
Link scanned plats to plat database
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Benefits
Linked writeup to plat database
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Benefits
Analyze development in Hamilton
County by tax year
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Platted
Parcels
1827-1889
1890-1946
1947-1971
1972-1987
1988-1998
2000-2007
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