2003. USGS National Center for EROS. The North America Shaded Relief data were derived from the GTOPO30 elevation data. GTOPO30 is a global digital elevation model (DEM) with a horizon... National Atlas of the United States.
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2003. East View Cartographic, Incorporated and East View Cartographic, Incorporated. LandScan 2003 Global Population Database is a raster theme representing population counts at 30 arc second resolution (1 km. or finer) as of 2003. East View Cartographic, Incorporated.
2003. National Geophysical and Solar-Terrestrial Data Center. This map shows light sources from human settlements around the world observed during 2003. The Defense Meteorological Satellite Program (DMSP) Oper... National Geophysical and Solar-Terrestrial Data Center.