Infrared Aerial Photography

http://pie-lter.ecosystems.mbl.edu/content/research-locations-maps-and-aerial-imagery
(2nd to last link on the web page)

Infrared aerial photography is a type of map created by satellites and high-altitude aircraft that give engineers and scientists the data to study landforms, vegetation health patterns and environmental pollution on the planet's surface by viewing the differences with "color". Satellites and high-altitude aircraft are equipped to record scenes of the Earth where light is shown on both the visible and invisible parts of the electromagnetic spectrum. Near-infrared light is invisible to the human eye, but adding this light to these images allows scientists to "see" the surface of the Earth in other than natural colors. The infrared aerial photo shown above shows the mouth of the Parker River and northern Plum Island Sound, Newbury, Massachusetts which shows a lot of material at the mouth of the stream that eventually lessens in intensity as the stream continues further on.