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National Land Cover Database 2001 Tree Canopy
Tree canopy measures the per-pixel density of tree cover across the United States and Puerto Rico. Tree canopy affects climate, the level of humidity underneath the canopy, soil erosion, and the amount of sunlight and rain reaching the ground.

Specifications
Resolution Projection Horizontal Datum Format Coverage
1 arc-second (approx. 30m)-Conterminous U.S. Albers Equal Area Conic NAD83 TIFF with world file Conterminous U.S. HI and AK

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URL: http://seamless.usgs.gov/canopy.php
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Page Last Modified: December 28, 2010