The U.S. Geological Survey and the federal interagency Multi‑Resolution Land Characteristics Consortium (MRLC) recently announced the completion of a massive database that describes the land surface condition of each 30-meter cell of land in the conterminous United States. Nearly six such cells - each 98 feet long and wide - would fit on a football field.
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Land cover is broadly defined as the biophysical pattern of natural vegetation, agriculture, and urban areas. It is shaped by both natural processes and human influences. NLCD 2001 data portrays 16 classes of land cover in the lower 48 states, the percent of tree canopy, and the degree of surface imperviousness in urban areas.
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Based on satellite imagery taken in 2001, the broad, yet precise database was constructed in a six‑year collaborative effort by the 11 MLRC agencies (www.mrlc.gov). The range and accuracy of information in the database enables managers of public and private lands, urban planners, agricultural experts, and scientists with many different interests (for instance, climate change or invasive species) to identify critical characteristics of the land for a wide variety of investigations.
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