WMS The Global Multi-Resolution Topography (GMRT) synthesis is a multi-resolution gridded compilation of edited multibeam sonar bathymetry data from the global and polar oceans, merged with terrestrial and lower resolution ocean data from GEBCO 2025. Seafloor bathymetric data acquired with multibeam sonars are used for a wide range of fundamental research purposes (e.g. in active studies of active seafloor geologic processes, bottom water circulation, biological habitats), as well as for more applied needs (e.g. marine resource management, tsunami inundation, submarine navigation). These data have been acquired for only a small fraction of the oceans and typically require specialist knowledge to access and utilize. The GMRT synthesis is the only global-scale multi-resolution compilation of these data that provides access to grids and images to the full native resolution of the source data, with comprehensive attribution information and access to the original data sources. The GMRT content is available in multiple formats and is intended for broad use for research and education. In GMRT, ocean elevation data has been merged with terrestrial elevation data from NASA's ASTER global product (30-m resolution) and the USGS National Elevation Dataset (NED) (10-m resolution). New source swath sonar data are obtained from public data archives and are rigorously evaluated, processed and cleaned by the GMRT Team before being merged with the GMRT multi-resolution global DEM. The GMRT synthesis is funded through the U.S. National Science Foundation. GMRT multibeam content has been included in the Google Earth ocean basemap since 2011, and in the international GEBCO compilation since 2014. Further details on the architecture of the GMRT content is available in Ryan et al. (2009) and from: https://gmrt.org/about/ GMRT Data Manager Marine Geoscience Data System info@marine-geo.org 4096 4096 text/xml image/png image/gif image/png; mode=8bit image/jpeg image/vnd.jpeg-png image/vnd.jpeg-png8 application/x-pdf image/svg+xml image/tiff application/x-protobuf application/json text/plain application/vnd.ogc.gml text/xml image/png image/gif image/png; mode=8bit image/jpeg image/vnd.jpeg-png image/vnd.jpeg-png8 text/xml XML INIMAGE BLANK GMRT_NP_Mask The Global Multi-Resolution Topography (GMRT) synthesis is a multi-resolution gridded compilation of edited multibeam sonar bathymetry data from the global and polar oceans, merged with terrestrial and lower resolution ocean data from GEBCO 2025. Seafloor bathymetric data acquired with multibeam sonars are used for a wide range of fundamental research purposes (e.g. in active studies of active seafloor geologic processes, bottom water circulation, biological habitats), as well as for more applied needs (e.g. marine resource management, tsunami inundation, submarine navigation). These data have been acquired for only a small fraction of the oceans and typically require specialist knowledge to access and utilize. The GMRT synthesis is the only global-scale multi-resolution compilation of these data that provides access to grids and images to the full native resolution of the source data, with comprehensive attribution information and access to the original data sources. The GMRT content is available in multiple formats and is intended for broad use for research and education. In GMRT, ocean elevation data has been merged with terrestrial elevation data from NASA's ASTER global product (30-m resolution) and the USGS National Elevation Dataset (NED) (10-m resolution). New source swath sonar data are obtained from public data archives and are rigorously evaluated, processed and cleaned by the GMRT Team before being merged with the GMRT multi-resolution global DEM. The GMRT synthesis is funded through the U.S. National Science Foundation. GMRT multibeam content has been included in the Google Earth ocean basemap since 2011, and in the international GEBCO compilation since 2014. Further details on the architecture of the GMRT content is available in Ryan et al. (2009) and from: https://gmrt.org/about/ EPSG:3995 -180 180 3.65869 90 North_Polar_Bathymetry Global Multi-Resolution Topography (GMRT) with lower resolution ocean data from GEBCO - North Polar Stereographic Projection epsg:3995 EPSG:3995 -180 180 -33.9954 90 text/xml