Tuesday, November 22, 2011

DOQQ maps

http://www.geology.enr.state.nc.us/doqq.html
A Digital Orthophoto Quarter-Quadrangle (DOQQ) map is an aerial image that has been rectified.  The rectification process removes any angle or distortion in scale.  In geometry, "ortho" means perpendicular, so an orthophoto is one that is perpendicular to the image.

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