source: http://www.topographic.com/2011_version/datasamples.htmDigital Ortho Quarter Quadrangl (DOQQ) maps are aerial photographs that have been digitally orthorectified (corrected for geometric, topographic, and camera distortions) so that the scale is uniformly accurate with the Earth's surface. Such images are often used for Geographic Information Systems (GIS) in which they are layered with other images to create highly informative and accurate representations of geographic locations.
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