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Available on 2 platforms
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SRTM15_PLUS is a global elevation grid at 15 arcsecond resolution (~500 meters) fusing land, ice, and seafloor topography. The dataset integrates 494 million edited depth soundings with gravity model predictions from CryoSat-2 and Jason. It serves as the foundational bathymetry layer for Google Earth and is produced by NOAA.
License information is not specified across the provided sources. The conflicting last updated dates require verification from the authoritative FTP site (topex.ucsd.edu).