DOQQs or digital orthophoto quarter quads are digital images produced by the USGS. They contain orthorectified aerial photography at a resolution of 1 meter. The uniform scale of a DOQQ makes it possible to determine map measurements or to overlay information, using the digital orthophoto as a base map. Features are represented in their true ground position, making direct measurement of distance, areas, angles, and positions possible. This picture is a DOQQ of Lake Travis in Austin, Texas.
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