National Land Cover Dataset

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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.

Tree Canopy Areas

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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.

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.

Cropland Data Layer

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This layer displays the Cropland Data Layer (CDL) developed by the USDA National Agricultural Statistics Service (NASS). The CDL is a raster, geo-referenced, crop-specific land cover data layer created annually for the continental United States using moderate resolution satellite imagery and extensive agricultural ground truth. The CDL has a ground resolution of 30 meters, and is validated using data from the USDA Farm Services Agency and United States Geological Survey. Historical CDL products are available for use and free for download through CropScape (https://nassgeodata.gmu.edu/CropScape/).

Cropland Data Layer, 2020

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This layer displays the Cropland Data Layer (CDL) developed by the USDA National Agricultural Statistics Service (NASS). The CDL is a raster, geo-referenced, crop-specific land cover data layer created annually for the continental United States using moderate resolution satellite imagery and extensive agricultural ground truth. The CDL has a ground resolution of 30 meters, and is validated using data from the USDA Farm Services Agency and United States Geological Survey. Historical CDL products are available for use and free for download through CropScape (https://nassgeodata.gmu.edu/CropScape/).