Digital Orthopho Quater Quad maps are created by the USGS. They are digital aerial photos that are have a uniform scale and a resolution of 1 meter. This allows you to use the map directly without any worries of distortion. The photo above shows a aerial infrared DOQQ photo of Johnston County in 1998. You can clearly see its a straight forward photo with no distortion from camera tilt or or the terrain.
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