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1 arcsecond (US) 3 arcsecond (Global) GTOPO30 Global Blue Marble Global ...
Goddard Space Flight Center GTOPO30 A global digital elevation model (DEM) with a horizontal grid spacing ...
thirty-arc-second data, SRTMGL30, to commensurate with GTOPO30. SRTMGL30 NASA Shuttle Radar Topography Mission ...