A DOQQ is a Digital Orthophoto Quarter Quadrangle. It is a one meter pixel resolution at a 1:12,000 scale. Most of the US is available in DOQQ. It is an aerial photo that has been corrected so it can read as a map. This is where I got my info and image: http://www.personal.psu.edu/mtc5031/project3pic3.jpg
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