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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.
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.
1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, and 2002. 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.