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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.
2011. Bay Area Open Space Council, Conservation Lands Network, San Francisco Bay Area Upland Habitat Goals Project, and GreenInfo Network (Firm). This raster dataset was derived from the 30 meter resolution Digital Elevation Model layer and depicts percent slope across the nine county San Fra... Bay Area Open Space Council.