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1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, and 2002. 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.
2002. National Atlas of the United States. The color Puerto Rico and U.S. Virgin Islands shaded relief data were derived from National Elevation Dataset (NED) data, and show the terrain of P... National Atlas of the United States.
2002. National Atlas of the United States. The color Puerto Rico and U.S. Virgin Islands shaded relief data were derived from National Elevation Dataset (NED) data, and show the terrain of P... National Atlas of the United States.
2002. EROS Data Center. The grayscale Puerto Rico and U.S. Virgin Islands shaded relief data were derived from National Elevation Dataset (NED) data, and show the terrain ... National Atlas of the United States.