A DOQQ is a type of geographic information system that combines an aerial photograph with the geometric qualities of a map. The aerial photograph of a DOQQ is distorted due to terrain relief and camera tilts. Due to this, the photograph has been georeferenced and orthocrectified. This helps remove the distortion of the areal photographs. By limiting distortion, accurate measures of distance, angels, area, positions can be determined. The picture above shows a DOQQ of Washington DC with a 1m resolution.
http://seamless.usgs.gov/products/1doqq.php
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