Category: Parcels

The Pitfalls of Assessor Address Data for Cross-Department Address Sharing

The Pitfalls of Assessor Address Data for Cross-Department Address Sharing

The most common source for address lists in City and County governments is the Assessor’s database. On the surface, this makes sense given that addresses fall on parcels, and the Assessor does a pretty good job keeping its data up to date. But anybody who has scratched the surface of Assessor data will quickly see that there are some serious limitations to site addresses sourced from an Assessor database....
Remodeling GIS Parcel Data for Ease of Use

Remodeling GIS Parcel Data for Ease of Use

In GIS parcel layers, I find that users tend to assume that APN (assessor parcel number) represents a unique key for each parcel geometry in a County. Nine times out of ten, this assumption is wrong, and results in an inaccurate analysis. Here is why… APN’s represent property tax accounts (a bit like your local gas and electric utility account number), and parcel geometries represent a piece of geography...