2003 Digital Orthophotography

In 2003, the North Central Texas Council of Governments facilitated the purchase of digital orthophotography (orthos) for all 16 counties in North Central Texas. The orthos were collected at 6-inch resolution for Collin, Dallas, Denton, Ellis, Kaufman, Navarro, Rockwall, and Tarrant counties and 1-foot resolution for the remaining counties. 

The contractors for this project were Dallas Aerial Surveys and Pixxures.  The orthos were collected in February and March 2003 and lower resolution images are available for purchase via the DFWmaps Marketplace according to the following price schedule.


Georeferenced TIFF images are sold in  3,000' x 2,000' tiles, or 0.215 square miles. Sample images and a shapefile of the tile structure may be downloaded below:

2-Foot Resolution Color Ortho Sample [TIFF format with world file; 4 MB]

4-Foot Resolution Color Ortho Sample [TIFF format with world file]

8-Foot Resolution Color Ortho Sample [TIFF format with world file]

TIFF orthophotography grid - ShapefileDXF file

Specifications

The digital orthophotography was produced using accepted photogrammetric industry practices under the supervision of Certified Photogrammetrists and Licensed Surveyors. Digital orthophoto products are guaranteed to meet National Map Accuracy Standards at a map scale of 1"=200' (1:2,400). Photo scale is 1"=1,500' (1:18,000). Products are mosaicked and color balanced to create a near seamless appearance.

Sensor Type Aerial film camera with 6" focal length (12" in downtown areas)
Negative Size 9" x 9"
Altitude of Capture 9,000' above mean terrain (12" focal length)
4,500' above mean terrain (6" focal length)
Capture Period January-March 2003
Control Sources Ground survey, airborne GPS, existing DEM, orthos 
Scanning Resolution 15 microns
Ground Resolution 0.5 and 1.0 US Survey Foot
Color Type 24-bit Natural Color
Coordinate System Texas State Plane, North Central Zone
Horizontal Datum NAD 83
Units US Survey Feet
Format TIFF or MrSID (1 MrSID tile = 120 TIFF tiles)


View the Metadata for more information on the 2003 orthophotography project.

For questions about 2003 digital aerial photography, visit the SDCP FAQ page or contact Shelley Broyles.