Cadastral Data Analysis
Cadastral Data management is one of the most important areas of GIS. Cadastral Data defines how a geographical area is divided up through legally defined and, usually, geo-referenced boundaries and land ownership. This includes: parcels, lots, townships, tracts, community subdivisions, land use/zoning, right-of-ways, and easements. It is the linkage of attributes to cadastral data that make these data valuable to users. These attributes include:
- Current and historical property ownership
- Parcel dimensions, size and area
- Appraised land and structure values
- Property taxes and their history
- Property and real estate history (lot splits, lot combinations, historical ownership, purchase date, etc.)
- Structures and structure footprint relative to property footprint
- Zoning, property use, and permits
- Property and mineral rights
By linking these attributes to cadastral data in relational databases, the variety of analysis and reference information that can be provided for property and tax management include:
- Making up-to-date tax maps and providing accurate parcel data.
- Illustrating trends in specific geographic areas including housing starts, foreclosures, housing values, and building type (single family, multi-family, etc.).
- Providing a visual, easy-to-use site for people to look up property data and history.
- Providing fair market value analysis for planners in determining costs for easements, right-of-ways, and land purchases.
- Determining land and structural values associated with natural disasters for emergency management.
- Assessing historic property development and use for mapping historical community development.
I have worked with cadastral data creating relational databases and shapefiles for a variety of projects. This includes projects in which I used cadastral data with other attributes and geospatial data as described below as well as in other projects described in Community and Infrastructure Mapping. Cadastral-based projects I have done include:
- Assisted Marion City Public Service Director in determining where easements needed to be obtained for the placement of a new sidewalk for US DOT/ODOT Safe Routes to School Grant. (Pictured Below)
- Determined which new and resurfaced sidewalks in the Safe Routes to School Grant were located in public right of ways and private property so that individual property owners could be fairly assessed. (Pictured Below)
- Created a map showing foreclosed and NSP 1 Parcels in the City of Marion, Ohio for a NSP2 Grant. (Pictured Below)