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A digital orthophoto quadrangle is aerial photography or satellite imagery that has been corrected so that its pixels are aligned with longitude and latitude lines, and have a narrowly defined region of coverage. This is a widely used format introduced by United States Geological Survey. The correction technique is called image rectification and is a large part of photogrammetry.
DOQs produced by the USGS cover an area measuring 7.5-minutes longitude by 7.5-minutes latitude or 3.75-minutes by 3.75-minutes. The second format is also known as a digital orthophoto quarter quadrangle because each covers one quarter of a quadrangle.
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