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NASADEM Merged DEM Global 1 arc second V001 provides global elevation data derived from the Shuttle Radar Topography Mission (SRTM). The dataset covers land between 60° N and 56° S latitude, accounting for about 80% of Earth's total landmass. It was produced by NASA's Land Processes DAAC using SRTM telemetry data from the 2000 STS-99 mission, enhanced with ASTER GDEM and ICESat GLAS ground control.
Data is distributed in 1 degree tiles; users must assemble tiles for larger regions. A corresponding NetCDF4 format product (NASADEM_NC) with source attribution (NASADEM_NUMNC) is also available.