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100-Meter Resolution Land Cover of the Conterminous United States, 2001

Identification Information

Citation
Title
100-Meter Resolution Land Cover of the Conterminous United States, 2001
Originator
Geological Survey (U.S.)
Publisher
National Geospatial Program, The National Map Small Scale
Place of Publication
Rolla , MO , US
Publication Date
2015-01-01
Identifier
http://purl.stanford.edu/wv372bn9329
Geospatial Data Presentation Form
mapDigital
Collection Title
National Atlas of the United States of America, 1997-2014
Other Citation Details
These data were downloaded from the National Atlas website (http://www.nationalatlas.gov/atlasftp.html) in August 2014.
Abstract
This raster layer is a georeferenced image containing land cover data for the conterminous United States, in an Albers Equal-Area Conic projection and at a resolution of 100 meters. The land cover data were derived from the 2001 National Land Cover Database (NLCD) Land Cover data set, a product of the Multi-Resolution Land Characteristics Consortium (MRLC). This layer is part of the 1997-2014 edition of the National Atlas of the United States.
Purpose
The 100-meter resolution land cover data were developed to portray the land cover 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.
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 land cover data and their corresponding RGB colors are listed in the color ramp (.clr) file that accompanies the data set. This table shows all land cover classes and the RGB color values used to represent them. Pixel value NLCD 2001 land cover classes R G B ---------------------------------------------------------------------------------- 11 Open water 72 109 162 12 Perennial ice / snow 229 231 232 21 Developed, open space 225 205 206 22 Developed, low intensity 220 152 129 23 Developed, medium intensity 241 0 0 24 Developed. high intensity 171 0 0 31 Barren land 179 175 164 41 Deciduous forest 107 169 102 42 Evergreen forest 29 101 51 43 Mixed forest 189 204 147 51 Dwarf scrub (Alaska only) 176 151 61 52 Shrub / scrub 209 187 130 71 Grassland / herbaceous 215 214 158 72 Sedge / herbaceous (Alaska only) 209 209 130 74 Moss (Alaska only) 130 186 158 81 Pasture hay 221 216 62 82 Cultivated crops 174 114 41 90 Woody wetlands 167 196 216 95 Emergent herbaceous wetlands 113 164 193 101, 102, 103 Non-U.S. land 240 235 211 0 Ocean water 193 224 250 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 dataset. 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 land cover 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 The National Map Web services can be found on the Web Map and Web Feature Services page; see http://nationalmap.gov/small_scale/infodocs/webservices.html.; {"gdaId" : 7088631}
Scale Denominator
1000000
Temporal Extent
Currentness Reference
ground condition
Time Instant
2001-01-01T00:00:00
Bounding Box
West
-130.573795
East
-62.664008
North
52.394589
South
21.111398
ISO Topic Category
imageryBaseMapsEarthCover
biota
Place Keyword
Alabama
Arizona
Arkansas
Colorado
Connecticut
Delaware
Florida
Georgia
Idaho
Illinois
Indiana
Iowa
Kansas
Kentucky
Louisiana
Maine
Maryland
Massachusetts
Michigan
Minnesota
Mississippi
Missouri
Montana
Nebraska
Nevada
New Hampshire
New Jersey
New Mexico
New York (State)
North Carolina
North Dakota
Ohio
Oklahoma
Oregon
Pennsylvania
Rhode Island
Rocky Mountains
South Carolina
South Dakota
Tennessee
Texas
Utah
Vermont
Virginia
Washington (D.C.)
Washington (State)
West Virginia
Wisconsin
Wyoming
United States
Place Keyword Thesaurus
geonames
Theme Keyword
Land cover
Theme Keyword Thesaurus
lcsh
Legal Constraints
Use Limitation
Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made by the U.S. Geological Survey regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. No responsibility is assumed by the U.S. Geological Survey in the use of these data.
Status
completed
Maintenance and Update Frequency
notPlanned
Collection
Collection Title
National Atlas of the United States of America, 1997-2014
URL
http://purl.stanford.edu/cv275yx9215
Language
eng
Credit
U.S. Geological Survey. (2015). 100-Meter Resolution Land Cover of the Conterminous United States, 2001. National Geospatial Program, The National Map Small Scale. Available at: http://purl.stanford.edu/wv372bn9329.
Point of Contact
Contact
John Hutchinson
Delivery Point
47914 252nd Street
City
Sioux Falls
Administrative Area
South Dakota
Postal Code
57198-0001
Country
US
Email
tnm_help@usgs.gov
Phone
1 605 594 6049

Spatial Reference Information

Reference System Identifier
Code
0
Code Space
Version

Data Quality Information

Lineage
Process Step
Description
Four land cover mosaics at 30-meter resolution were downloaded from the MRLC web site and used to produce land cover data files of the conterminous United States, Alaska, Hawaii, and Puerto Rico and the U.S. Virgin Islands. NLCD stores data for the conterminous United States, Alaska, and Hawaii in the same Albers Equal-Area Conic projection used by the National Atlas. Data for Puerto Rico and the U.S. Virgin Islands (PRVI) were reprojected to match the Albers projection parameters used by the National Atlas for that area. All data were resampled to 100-meter resolution and extents set to match National Atlas neatlines for the four areas. This map layer includes the data file for the conterminous United States. Using the ArcGIS Feature-to-Raster command, a 0/1 land/water mask for the conterminous United States was created from the 1:1,000,000-scale National Atlas coastline, at the same 100-meter resolution and with the same extent as the land cover data. The land/water mask was applied to the land cover grid with a software routine that used the ArcGIS Multiply command to clip land cover values that fell in ocean areas. The routine used the ArcGIS Nibble command to fill out land cover values to the coastline. The Canadian shoreline of the Great Lakes was extracted from NSFH_2008 and incorporated into the data set used to generate the land/water mask. Ocean areas were set to a pixel value of 0. The land/water mask is available on request. In the conterminous United States land cover data set, non-data pixels were set to separate values: 101 for Canada, 102 for Mexico, and 103 for The Bahamas and Cuba. In Alaska: 101 for Canada and 102 for Russia. In PRVI: 101 for the British Virgin Islands.
Process Date
2012-01-01T00:00:00
Source
Title
Atlas of Canada 1,000,000 National Frameworks Data, Hydrology - Drainage Network
Publication Date
2008-01-01
Originator
Government of Canada, Natural Resources Canada, Canada Centre for Remote Sensing, The Atlas of Canada
Publisher
Government of Canada
Description
Spatial information.
Source
Title
NLCD 2001 Land Cover
Publication Date
2007-01-01
Originator
U.S. Geological Survey
Publisher
U.S. Geological Survey
Description
Spatial and attribute information
Source
Title
1:1,000,000-Scale Coastlines of the United States
Publication Date
2012-07-01
Originator
National Atlas of the United States
Description
Spatial information.

Distribution Information

Format Name
GeoTIFF
Distributor
Stanford Geospatial Center
Online Access
http://purl.stanford.edu/wv372bn9329
Protocol
http
Name
ldco48i0100a.tif
Function
download

Content Information

Content Type
thematicClassification

Spatial Representation Information

Raster
Number of Dimensions
2
Row Count
31390
Column Count
49810
Cell Geometry Type
area
Corner Points
Point
-2540000.000000 119000.000000
Point
-2540000.000000 3258000.000000
Point
2441000.000000 3258000.000000
Point
2441000.000000 119000.000000
Center Point
-49500.000000 1688500.000000

Metadata Reference Information

Hierarchy Level
dataset
Metadata File Identifier
edu.stanford.purl:wv372bn9329
Parent Identifier
http://purl.stanford.edu/cv275yx9215.mods
Dataset URI
http://purl.stanford.edu/wv372bn9329
Metadata Date Stamp
2016-01-12
Metadata Standard Name
ISO 19139 Geographic Information - Metadata - Implementation Specification
Metadata Standard Version
2007
Character Set
utf8
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