Infrared aerial photography is a powerful tool that can be used to document changes in the environment, health of wetlands and forests, and even monitor sites contaminated by toxic chemicals (http://www.aerialarchives.com/Infrared-Aerial-Photography.htm). The above example of infrared aerial photography is a photograph of the Onondaga Lake area.
http://www.onlakepartners.org/gif/p1101d.gif 
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