Pima County Department of Transportation

Geographic Information Services Division

Geographic Data Library - Imagery

PAG 2002 Regional Digital Orthophoto Project

Overview

The Pima Association of Governments (PAG) and a number of local government jurisdictions participate in the Regional Orthophoto Project which started with the1998 project and continues with updates every few years. Each project includes imagery and some include elevation data.

The orthophoto projects for the various years are all different. Differences include methods, coverage areas, elevation modeling, resolution, and spectra (black and white or color).

The 2002 project includes:

1 foot resolution multispectral (color) imagery of 3,272 sections, consisting of all of eastern Pima County and a few areas beyond the county border.
6 inch resolution panchromatic (black and white) imagery of 354 sections of selected areas in eastern Pima County.
DEM elevation data for 1,766 sections of the project area.
DTM elevation data for 354 sections of the project area.
Contours for 354 sections of the project area.

See the PAG 2002 Project Map.

The 2002 project was data was gathered (flown) in August and September, 2002.

Resources

Orthophotography Definitions are helpful to understanding orthophotography and these pages.
See PAG Orthophoto Project Data Availability for PLSS Sections to determine availability in specific sections.
See Viewing Orthophoto Imagery and Information for help for using Pima County MapGuide Maps to view this information.
See Orthophoto Imagery for more about orthophotos.

Specifications

See the 2002 Orthophoto Data Set Specifications from the Pima Association of Governments for more. Also see our Pima County MapGuide Maps which include not only the imagery and topography (elevation information), but also a group of "Orthophoto Project Area" layers which show the coverage of various project products.

Multispectral (color) imagery horizontal accuracy specification:

95% of all planimetric features that are well defined on the photograph shall be accurate to at least +/-4.0 feet of its true coordinate position. None of the features shall be displaced more than +/-8.0 feet from its true coordinate position.

Panchromatic (black and white) horizontal accuracy specification:

95% of all planimetric features that are well defined on the photograph shall be accurate to at least +/-2.0 feet of its true coordinate position. None of the features shall be displaced more than +/-4.0 feet from its true coordinate position.