http://www.utexas.edu/depts/grg/hudson/grg360g/EGIS/final_project/spring04_projects/web_justin_reynolds/Lake%20Travis.htm
This is an illustration of a DOQQ map and is used to digitize an image of a photograph (aerial) and corrected for displacements caused by various camera angles and relief. It is spatially accurate with the different planimetric features appearing in their true geographic positions on the planet.
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