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What is a GPIN?

April 26, 2017gpin

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What is a GPIN?

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The Grid Parcel Identification Number (GPIN) is a unique 10-digit number that represents an x, y coordinate on the Prince William County proprietary grid. GPINs are calculated using GIS software. Each time the boundary of a parcel changes, a new GPIN is calculated, reflecting the new center of the parcel. The parcel’s history can then be tracked using it’s “parent” GPIN. Because the GPIN is a coordinate identifier rather than a hierarchical identifier, the number is not related to size or any other characteristics of the polygons and gives no information about what subdivision a parcel belongs to or what parcel it was created from. That information is derived from related tables describing the subdivision and the parent-parcel. Any parcel separated by a road and/or having noncontiguous polygons for any reason is still considered a single parcel and is assigned one GPIN. However, each polygon associated with that parcel will be assigned an individual centroid. GPINs can be used to quick