A Digital Orthophoto Quarter-Quadrangle (DOQQ) is a digital aerial photograph that has been geometrically corrected from the original photograph which contains distortion caused by the camera's lens. DOQQs have a resolution of one meter and cover a quarter of a USGS 7.5 minutes quad or a 20x20 mile photo. This DOQQ shows the Colorado River and is taken to examine flood conditions in Texas.
http://www.crwr.utexas.edu/gis/gishydro00/Class/trmproj/Donnelly/termproject_files/1_Red_DOQQ.jpe
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