http://www.geomart.com/products/geodata/
Above represented is a DOQQ map, also more commonly known as a Digital Orthophoto Quadrangle. This map type is a computer generated image of an aerial photograph that displaces the image based off of terrain relief an camera tilt. This image originates from the original image characteristics as well as georeferenced qualities that are incorporated into the map. Most DOQQ map images are in black and white, with some neutral color or infrared color incorporated.
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