100-Meter Resolution Tree Canopy of the Conterminous United States, 2001

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Abstract/Contents

Abstract
This raster layer is a georeferenced image containing tree canopy data for the conterminous United States, in an Albers Equal-Area Conic projection and at a resolution of 100 meters. The tree canopy data were derived from the 2001 National Land Cover Database (NLCD) Percent Tree Canopy data set, a product of the Multi-Resolution Land Characteristics Consortium (MRLC). The MRLC is a multi-agency cooperative effort to study land cover change. This layer is part of the 1997-2014 edition of the National Atlas of the United States.
Purpose
The 100-meter resolution tree canopy data were developed to portray the tree canopy of the United States at 1:1,000,000 scale. They are intended primarily for visual purposes. The original NLCD data should be used for conducting scientific analysis.

Description

Type of resource cartographic, software, multimedia
Form GeoTIFF
Publisher Geological Survey (U.S.)
Publication date 2013
Language English
Digital origin born digital
Map data 1:1000000Scale not given. ; Custom projection W 133°--W 59°/N 51°--N 19°W 130°34ʹ26ʺ--W 62°39ʹ50ʺ/N 52°23ʹ41ʺ--N 21°6ʹ41ʺ, Scale not given ; EPSG::4326

Creators/Contributors

Creator Geological Survey (U.S.)

Subjects

Subject Forest canopies
Subject Forests and forestry
Subject Alabama
Subject Arizona
Subject Arkansas
Subject Colorado
Subject Connecticut
Subject Delaware
Subject Florida
Subject Georgia
Subject Idaho
Subject Illinois
Subject Indiana
Subject Iowa
Subject Kansas
Subject Kentucky
Subject Louisiana
Subject Maine
Subject Maryland
Subject Massachusetts
Subject Michigan
Subject Minnesota
Subject Mississippi
Subject Missouri
Subject Montana
Subject Nebraska
Subject Nevada
Subject New Hampshire
Subject New Jersey
Subject New Mexico
Subject New York (State)
Subject North Carolina
Subject North Dakota
Subject Ohio
Subject Oklahoma
Subject Oregon
Subject Pennsylvania
Subject Rhode Island
Subject Rocky Mountains
Subject South Carolina
Subject South Dakota
Subject Tennessee
Subject Texas
Subject Utah
Subject Vermont
Subject Virginia
Subject Washington (D.C.)
Subject Washington (State)
Subject West Virginia
Subject Wisconsin
Subject Wyoming
Subject United States
Subject 2007
Subject Imagery and Base Maps
Subject Biology and Ecology
Genre Geospatial data
Genre Cartographic dataset

Bibliographic information

Supplemental information NLCD data sets at 30-meter resolution may be downloaded from the MRLC Web site, http://www.mrlc.gov/nlcd01_data.php. Further information on NLCD, related data sets, and land cover research may be found at the online USGS Land Cover Institute http://landcover.usgs.gov/. Pixel values for tree canopy data and their corresponding RGB colors are listed in the color ramp (.clr) file that accompanies the data set. This table shows all tree canopy classes and the RGB color values used to represent them. >Pixel value NLCD 2001 Tree Canopy classes R G B >================================================================================== >1 through 100 Percent tree canopy, 1% through 100% See .clr for RGB's >101, 102, 103 Non-U.S. land 240 235 211 >104 Background U.S. land 104 104 104 >0 Ocean water 193 224 250 Pixel values 1 through 100 represent the percentage covered by tree canopy, as seen from above. Pixel value 101 represents land in Canada or the British Virgin Islands. Pixel value 102 represents land in Mexico or Russia. Pixel value 103 represents land in The Bahamas and Cuba in the southeastern part of the data set. Pixel value 104 represents U.S. land that does not have valid data values. There are no null values in the image. Included with the GeoTIFF are an auxiliary information file (.aux.xml), an image overview file (.ovr), a value attribute database file (.vat.dbf), a .tfw file (more information included below), a .prj file (more information included below), and an Adobe Color Table (.act) file. The contents of the associated world file (.tfw) are: >100.0 >0.0 >0.0 >-100.0 >-2539950.0 >3257950.0 The projection (.prj) file contains the following information: >PROJCS["Albers_NAD83_L48", >GEOGCS["GCS_North_American_1983", >DATUM["D_North_American_1983", >SPHEROID["GRS_1980",6378137.0,298.257222101]], >PRIMEM["Greenwich",0.0], >UNIT["Degree",0.0174532925199433]], >PROJECTION["Albers"], >PARAMETER["False_Easting",0.0], >PARAMETER["False_Northing",0.0], >PARAMETER["Central_Meridian",-96.0], >PARAMETER["Standard_Parallel_1",29.5], >PARAMETER["Standard_Parallel_2",45.5], >PARAMETER["Latitude_Of_Origin",23.0], >UNIT["Meter",1.0]] Data set extent in meters (Albers Equal-Area Conic projection) >North 3258000 >West -2540000 >East 2441000 >South 119000 There are no NULL or NODATA values in the GeoTIFF. Instead, all tree canopy values in oceans have been set to zero as part of the masking process. A copy of the land/water mask used in processing is available on request. Information about National Atlas Web services can be found on the Web Map and Web Feature Services page; see http://nationalatlas.gov/infodocs/webservices.html. ; {"gdaId" : 6152789}
WGS84 Cartographics This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.
Location https://purl.stanford.edu/nh022gd9639

Access conditions

Use and reproduction
This item is in the public domain. There are no restrictions on use.
Copyright
This work is in the Public Domain, meaning that it is not subject to copyright.

Preferred citation

U.S. Geological Survey. (2013). 100-Meter Resolution Tree Canopy of the Conterminous United States, 2001. USGS. Available at: http://purl.stanford.edu/nh022gd9639.

Collection

National atlas of the United States of America, 1997-2014

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