The image shown above is an example of a digital orthographic quarterly quad map (DOQQ). A DOQQ map is a type of topographic map that shows the topography of an area. What makes these maps special is that they use the characteristics of an aerial image and combine it with the geometric characteristics of the paper map. This removes the distortions of the aerial photo and allows it to be better suited to be a flat map. By this means, the map is georectified and orthorectified.. The map above is the DOQQ of an aerial photo of a developing area. I can tell the make-out of all the building and roads, and I can tell that it is a large area that has been squared away to be shown flat as a map.
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