Global Multi-Resolution Topography (GMRT) Synthesis

GMRT is a continuously-updated global synthesis of seafloor topography derived from multibeam bathymetry data. The synthesis is maintained as a multi-resolution gridded digital elevation model (DEM) to ~100m spatial resolution, and is merged with land topography data from the Shuttle Radar Topography Mission (SRTM). In the oceans, multibeam data are merged with regional lower-resolution compilations including the 1997 Smith & Sandwell satellite predicted bathymetry, International Bathymetric Chart of the Arctic Ocean (IBCAO), and SCAR Subglacial Topographic Model of the Antarctic (BEDMAP). A more detailed abstract is available.

Make your own maps and custom grids to download from our global bathymetry database by selecting a geographic region or focus/study site below.