A digital orthophoto quarter quadrangle maps
are generated by the USGS and are digital aerial photographs. The photos are geometrically
matched and corrected with previous/original photos of the same areas. In addition,
a process of rectifaction corrects these maps.
The example map is of Johnston County, Flowers
NE. Image was taken in 1998.
Reference URL: http://www.lib.ncsu.edu/gis/doqq.html
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