2005. EROS Data Center. The grayscale North America shaded relief data were derived from the GTOPO30 elevation data. GTOPO30 is a global digital elevation model (DEM) with... National Atlas of the United States.
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2005. Oak Ridge National Laboratory. The LandScan 2005 global population dataset is a worldwide population database compiled on a 30" X 30" latitude/longitude grid. Census counts (at s... Oak Ridge National Laboratory.
2005. National Atlas of the United States. The Topographic and Bathymetric Shaded Relief of North America map layer shows depth and elevation ranges using colors, with relief enhanced by sha... National Atlas of the United States.