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1. Global 30-Arc-Second Elevation Data Set [GTOPO30]
Digital elevation model (DEM) data are sampled arrays of surface elevations in raster form. A DEM provides elevation values in rows and columns, corresponding to a regular grid of points on the Earth's ...

2. HYDRO1k Elevation Derivative Database [HYDRO1k]
HYDRO1k is a geographic database developed to provide comprehensive and consistent global coverage of topographically derived data sets, including streams, drainage basins and ancillary layers derived ...

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