http://www.lib.ncsu.edu/gis/doqq.html#bw
Digital Orthophoto Quarter Quads, or DOQQs are simply aerial photographs that are taken by the USGS. These are large scale photos that have a resolution of 1 meter. This particular DOQQ is an infrared photograph, they are taken in either infrared or black and white. This is an infrared DOQQ of Johnston County, Nebraska.
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