Source: http://www.nps.gov/history/history/online_books/indu/1085/sec3.htmA type of remote sensing used as part of DOQQ from the USGS. The infrared light spectrum allows for the identification of elements not visible using the standard light spectrum. An examples being different types of vegetation, which in these wavelengths appear differently. The photo is of the Indiana Dunes National Lakeshore. Vegetation is displayed as red.
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