Geospatial Analysis at Jefferson County Property Valuation Administration Jay Mickle, Director of GIS & Internal Technology

 Responsible for assessing all real property at fair market value  287,000 mapped parcels; over 311,000 total property records  Statutory responsibility to inspect all parcels at least once every 4 years  Real property assessments broken up by land and improvement value

 PVA uses a 3 rd party extension to ArcMap to edit & maintain Jefferson County’s parcel map

-Use interpolation methods to create a prediction surface for residential vacant parcels by using land-sale data. -Extract values from the prediction surface to derive a value per square foot for each vacant parcel. -To reduce error from any one interpolation method, three different interpolation methods will be used and averaged.

-High Values in established up scale housing areas -High values in “trendy” areas -High values in areas with large new housing developments -Low values in urban low income areas -Low values in areas with large parcel sizes and large amounts of undeveloped land

 Predict commercial land value in the Central Business District (CBD) and along major transportation corridors using data based on sales of commercial vacant land in those areas.  To create a marketable booklet containing tables, maps, and charts of commercial vacant land sales and the corresponding predicted land values in the CBD and along major transportation corridors.

 Need to study effect of foreclosures on property values  Lower sales prices affect our entire reassessment plan  Vacant structure data also reviewed alongside foreclosures