Pima County Geographic Information Systems
About the GIS Library
GIS Library Overview
- Descriptive information about each dataset.
GIS Data Products - Acquiring Our GIS Data
GIS Layer Field Names and Standard Fields
, aka "stump" fields.
The Surveying System in Pima County
: Townships, Ranges, and Sections.
Situs (Property) Addresses
Glossary of terms
Arizona Coordinate System, 1983
Projection Parameters and Projecting Our Data
Measurement Units: International Foot vs. US Survey Foot
advantages of using NAD 1983
instead of the older NAD 1927 Datum are described in
The Problem With NAD 27
by Bill Strange, National Geodetic Survey (Retired).
The National Geodetic Survey's
FAQ's about Datums, GPS and Positions