http://www.tceq.state.tx.us/gis/doqtnrcc.html
Digital orthographic quarter quads or DOQQ combines the mixture of an aerial photograph with the geometric qualities that can be found in a map. These maps are useful because they display some features that can be left out of or generalized in a standard map. They can also be used to find direct measurement of distances, areas, angles, and positions.
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