These are the commonly used projections within our GIS system and their defining parameters as used by ArcInfo Workstation PROJECT subcommands with zones appropriate for Pima County. (The comments in parenthesis are not included.) All of the library vector layers are NAD83 HPGN. Imagery is generally not reprojected. For instance most statewide Arizona imagery is NAD83 UTM Arizona zone 12 North, Meters
Also see About the GIS Library, especially Arizona Coordinate System, 1983.
See Using ArcGIS ArcToolbox Project and Projection Parameters for help with .prj files and projecting our data.
| NAD83 HPGN |
NAD83-92 HARN (also known as HPGN)
State Plane
Arizona Central Zone (FIPS Zone 0202)
International Feet |
projection stateplane
units 3.280839895 (international feet)
datum hpgn
fipszone 0202 (AZ central) |
| NAD27 |
|
projection stateplane
units feet (survey feet)
datum nad27
zone 3176 (AZ central) |
| UTM |
NAD83 UTM Arizona zone 12 North, Meters |
projection utm
units meters
datum nad27 (or nad83)
zone 12 (utm zone) |
| LAT/LON |
|
projection geographic
units dd (decimal degrees)
datum none |