This is an Infrared Ariel Photo of the Mississippi River showing the main navigation channel to the left and the adjacent secondary channel to the right. Infrared Photos are typically used to detect certain spectrum of light. It is used to note changes in the environment and track different qualities of a given area. This photo is part of an ongoing effort to assess the consequences of human fishing services and its affect on the given area as well as the marine life.
Found At: http://www.umesc.usgs.gov/aquatic/deep_channels.html
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