DOQQ- digital orthophoto quarter quad- an aerial photo that has been digitally corrected so that the scale is uniform and is has the same lack of distortion as a map.
The biggest difference between a DOQQ and a standard aerial image is that the distortion inherent in an aerial photo has been removed. A DOQQ starts with an aerial photo, which is then georectified to eliminate distortion caused by camera tilt and terrain relief. DOQQs can be used as the base for other maps, while aerial photos should not be used for base maps.
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