http://www.lib.ncsu.edu/gis/doqq.html#cir
DOQQs use aerial images that are displayed by the USGS. These maps use a resolution of 1 meter. These maps use orthorectified aerial photography which is a computer generated image. By doing this the terrain relief and camera tilts can be removed. This picture provided is a picture of a land area which shows no type of terrain relief or tilt, making it a DOQQ map.
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