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Imagery and Base Maps
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Subject
Orthophotography
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Year
1992
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1. Digital Orthophoto (DOQQ - quarter-quadrangle) for Delaware 1992
1992. U.S. Geologic Survey; Pennsylvania Bureau of Topographic and Geologic Survey. Orthophotos combine the image characteristics of a photograph with the geometric qualities of a map. The primary digital orthophotoquad (DOQ) is a ...