DOQQ refers to Digital Orthographic Quarter-Quads and are
produced by the USGS. These types of maps combine image characteristics that
were taken from an aerial photograph. The DOQQ is an aerial photo that has been
taken and orthorectified, a technique that removes distortion out of the aerial
photo so that it can be used as a flat map. The DOQQ image above shows part of
a Farmville in North Carolina.
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