A digital ortho quarter quads map or DOQQ is produced through aerial photography. Most aerial photography produces distortion, but this method uses a uniform scale that allows many photos to be put together to form a true map. This method is not without issues however. The map I selected is part of a presentation from the USDA on issues one might have with DOQQ. The map below from NAIP04 DOQQ is 3109163_nw and lacks contrast and color due to haze.
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