Pima County Department of Transportation

Geographic Information Services Division

Geographic Data Library - Imagery

PAG 2005 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 2005 project includes:

Imagery covering 1,814 sections (with some overlapping products) of selected areas in eastern Pima County.
- 1 foot resolution multispectral (color) imagery of 1,133 sections of selected areas in eastern Pima County.
- 6 inch and 1 foot resolution multispectral (color) imagery of 742 sections of selected areas in eastern Pima County.
- 3 inch, 6 inch and 1 foot resolution multispectral (color) imagery of 2 sections (141406E and 141407E) in the Univeristy of Arizona area.
LIDAR elevation data for 2,349 sections, more than the entire project area.
DEM elevation data for 653 sections of the project area.
DTM elevation data for 131 sections of the project area.
Contours for 133 sections of the project area.

See the PAG 2005 Project Map.

The PAG Orthophoto 2005 project imagery was gathered (flown) in May 2005. Delivery of the imagery started in February 2006 and was completed at the start of May 2006.

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 2005 Orthophoto Data Set Specifications from the Pima Association of Governments for more. Also see our Pima County MapGuide Maps which includes not only the imagery, 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 +/-3.0 feet of its true coordinate position. None of the features shall be displaced more than +/-6.0 feet from its true coordinate position.