Digital orthophoto quadrangle
A digital orthophoto quadrangle (DOQ) 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 rectification and is a large part of photogrammetry.
- "USGS GeoData Digital Orthophoto Quadrangles" (PDF). USGS Fact Sheet 057-01. U.S. Geological Survey. May 2001. http://edc2.usgs.gov/pubslists/factsheets/fs05701.pdf.
- "Introduction to Photogrammetry". The Aerial Archive. Institute for Prehistory and Protohistory of the University of Vienna. http://www.univie.ac.at/Luftbildarchiv/wgv/intro.htm.
- U.S. Geological Survey Mapping in the 20th Century: 1980’s - Digital Orthophoto Quadrangles
- Birthplace of the DOQ — USGS Western Region
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