全球地形数据tif格式

<PAMDataset> <Metadata> <MDI key="NC_GLOBAL#Conventions">COARDS/CF-1.0</MDI> <MDI key="NC_GLOBAL#title">ETOPO1_Ice_g_gmt4.grd</MDI> <MDI key="NC_GLOBAL#history">grdreformat ETOPO1_Ice_g_gdal.grd ETOPO1_Ice_g_gmt4.grd=ni</MDI> <MDI key="NC_GLOBAL#GMT_version">4.4.0</MDI> <MDI key="NC_GLOBAL#node_offset">0</MDI> <MDI key="z#long_name">z</MDI> <MDI key="z#_FillValue">-2147483648</MDI> <MDI key="z#actual_range">-10898, 8271</MDI> <MDI key="x#long_name">Longitude</MDI> <MDI key="x#actual_range">-180, 180</MDI> <MDI key="x#units">degrees</MDI> <MDI key="y#long_name">Latitude</MDI> <MDI key="y#actual_range">-90, 90</MDI> <MDI key="y#units">degrees</MDI> </Metadata> <Metadata domain="Esri"> <MDI key="PyramidResamplingType">NEAREST</MDI> </Metadata> <PAMRasterBand band="1"> <Metadata> <MDI key="NETCDF_VARNAME">z</MDI> </Metadata> </PAMRasterBand> </PAMDataset>