Above is an aerial photo of the San Joaquin River Valley Delta near Sacramento, California. Developed using the infrared spectrum, a reader of the map is able to benefit greatly with the visibly distinct separation of topographic features. Because the different shades of red make each feature of the map distinct, it further amplifies the ability to reference points as if you were in a plane above the region.
http://aerialarchives.photoshelter.com/gallery/Infrared-Aerial-Photography/G0000FeWbK1_GNLQ/
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