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GTOPO30 - Global Topographic Data Click on an area of the map to preview or download data. GTOPO30 mirror site in Japan (hosted by the Geographical Survey Institute of Japan) Representative applications of GTOPO30 HYDRO 1K: Elevation Derivative Database GTOPO30 is a global digital elevation model (DEM) with a horizontal grid spacing of 30 arc seconds (approximately 1 kilometer). GTOPO30
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