Digital Orthographic Quarter-Quads (DOQQ) use a mixture of aerial images and map qualities to georeference and orthorectify basic areal photographs into useful flat maps. In standard areal photographs ground features are distorted, but through the process of orthorecitifcation those features are shown in their true position. Digital Orthographic Quarter-Quads help improve many qualities of basic aerial photographs such as accurate measurement of distance, areas, angles, and positions. The image above is a Digital Orthographic Quarter-Quad of the Texas Longhorns football stadium and the area surrounding the stadium. This photo accurately displays the stadium and its surrounding area without omitting or generalizing key features.
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