2001. National Atlas of the United States. The Bathymetric Shaded Relief of North America map layer shows depth ranges using colors, with relief enhanced by shading. The image was derived fr... National Atlas of the United States.
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2001. National Atlas of the United States. The Bathymetry of North America map layer shows depth ranges using colors. The image was derived from the National Geophysical Data Center's ETOPO2... National Atlas of the United States.
2001. Oak Ridge National Laboratory. The LandScan 2001 global population data set is a worldwide population database compiled on a 30" X 30" latitude/longitude grid. Census counts (at ... Oak Ridge National Laboratory.
2001. National Geophysical and Solar-Terrestrial Data Center. This map shows light sources from human settlements around the world observed during 2001. The Defense Meteorological Satellite Program (DMSP) Oper... National Geophysical and Solar-Terrestrial Data Center.
2001. United States. Minerals Management Service. This polygon shapefile shows the official protraction diagram (OPD) and leasing map boundaries for the United States, covering areas of the Outer C... Geological Survey (U.S.).
2001. World Wildlife Fund and Environmental Systems Research Institute (Redlands, Calif.). This polygon shapefile represents World Wildlife Fund (WWF) global marine ecoregions. Ecoregions are defined as relatively large areas of land or w... Environmental Systems Research Institute (Redlands, Calif.).
2001. World Wildlife Fund and Environmental Systems Research Institute (Redlands, Calif.). This polygon shapefile represents World Wildlife Fund (WWF) global terrestrial ecoregions. Ecoregions are defined as relatively large areas of land... Environmental Systems Research Institute (Redlands, Calif.).