Global Topographic 30 Arc-Second Digital Elevation Model: Released 1996
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'GTOPO30 is a global digital elevation model (DEM) with a horizontal grid spacing of 30 arc seconds (approximately 1 kilometer). GTOPO30 was derived from several...
GTOPO30是一款全球数字高程模型（Digital Elevation Model，DEM），其水平网格间距为30弧秒（约1公里）。GTOPO30源自多个……
