The National Land Cover Database (NLCD) serves as the definitive Landsat-based, 30-meter resolution, land cover database for the Nation. NLCD provides spatial reference and descriptive data for characteristics of the land surface such as thematic class (for example, urban, agriculture, and forest), percent impervious surface, and percent tree canopy cover. NLCD supports a wide variety of Federal, State, local, and nongovernmental applications that seek to assess ecosystem status and health, understand the spatial patterns of biodiversity, predict effects of climate change, and develop land management policy. NLCD products are created by the Multi-Resolution Land Characteristics (MRLC) Consortium, a partnership of Federal agencies led by the U.S. Geological Survey.
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This layer shows the percentage of land area covered by tree canopy based on data from the 2016 The National Land Cover Database (NLCD) Percent Tree Canopy Collection. The NLCD tree canopy imagery is a product of the U.S. Forest Service (USFS), and is produced through a cooperative project conducted by the Multi-Resolution Land Characteristics (MRLC) Consortium (www.mrlc.gov). Tree canopy values range from 0 to 100 percent.
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In order to generate percent tree canopy values for census geographies, the NLCD 2016 Percent Tree Canopy Analytical Dataset was processed using ESRI Zonal Statistics tools. Zones were based on US Census Block Group boundaries from the ESRI Map Data pack for ArcGIS 10.6. These figures were aggregated and mapped at the census block group, census tract and county levels. Census tract and county figures are also available as population weighted percentages based on 2010 Decennial Census figures.