|Date(s):||Coverage Availability/Geographic Extent:||Footprint:||Source(s):|
|1995||Texas||1/4 USGS Quadrangle, County||TNRIS|
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Orthoimagery - Statewide
|Available Formats:||GeoTiff, MrSID|
|Derivative Data:||Compressed County Mosaics|
|Known Issues:||Age, Color balance, some images black and white|
A set of digital orthophoto images that are produced for the Texas Orthoimagery Program (TOP). TOP is administered by the Texas Department of Information Resources (DIR) on behalf of the Texas GIS Planning Council for the purpose of creating digital orthophoto quarter quadrangles (DOQs) throughout the state. TOP is supported by contributions from the Federal Government, the State of Texas, and local and regional organizations.
The DOQ products produced for the Department of Information Resources and the GIS Planning Council under the Texas Orthoimagery Program reside in the public domain. A digital orthophoto is a raster image of remotely sensed data in which displacement in the image due to sensor orientation and terrain relief have been removed. Orthophotos combine the image characteristics of a photograph with the geometric qualities of a map. The DOQ is a 1-meter ground resolution, quarter-quadrangle (3.75-minutes of latitude by 3.75-minutes of longitude) image cast on the Universal Transverse Mercator Projection (UTM) on the North American Datum of 1983 (NAD83).