Pima County Department of Transportation

Geographic Information Services Division

Geographic Data Library - Imagery

PAG 2008 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 2008 project includes:

Imagery covering 1,795 sections of selected areas in eastern Pima County with limited adjacent areas in Pinal and Cochise counties.
- 1 foot resolution multispectral (color) imagery of 1,240 sections of selected areas primarly in eastern Pima County with limited adjacent areas in Pinal County Cochise counties. 85 of these sections are in the Tohono O'Odham Nation. The Pima County GIS library and maps do not include these 85 sections in the Tohono O'Odham Nation.
- 4 inch and 1 foot resolution multispectral (color) imagery of 557 sections of selected areas in eastern Pima County.
LIDAR elevation data for all imagery areas.
DTM elevation data and 2-foot contours for 93 sections of the project area. These DTM areas in the Tohono O'Odham Nation and the City of Benson and are not included in the Pima County GIS library.

See the PAG 2008 Project Map .

The PAG Orthophoto 2008 project imagery was gathered (flown) from March 28th, 2008 through April 7th, 2008 and is commonly identified as simply "April 2008". Our Pima County MapGuide Maps use the layer name "2008/04 PAG Color Orthophoto Imagery". Delivery of the imagery started in late 2008 and was completed at the end of January 2009.

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 2008 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.