A digital orthophoto quadrangle (DOQ) is a computer-generated image of an aerial photograph in which image displacement caused by terrain relief and camera tilts has been removed. It combines the image characteristics of a photograph with the geometric qualities of a map.
http://www.isgs.uiuc.edu/nsdihome/webdocs/doqs/images/charleston_q30.jpghttp://www.isgs.uiuc.edu/nsdihome/webdocs/doqs/images/charleston_q30.jpg
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