Global Multi-Resolution Topography Data Synthesis

Create Custom Maps and Grids with GMRT MapTool
Now available in South Polar and North Polar Projections!

The Global Multi-Resolution Topography (GMRT) synthesis is a multi-resolutional compilation of edited multibeam sonar data collected by scientists and institutions worldwide, that is reviewed, processed and gridded by the GMRT Team and merged into a single continuously updated compilation of global elevation data. The synthesis began in 1992 as the Ridge Multibeam Synthesis (RMBS), was expanded to include multibeam bathymetry data from the Southern Ocean, and now includes bathymetry from throughout the global and coastal oceans. GMRT is included in the ocean basemap in Google Earth (since June 2011) and the GEBCO 2014 compilation. Learn more >

GMRT v3.9 was released in March 2021 and includes 35,696,795 square kilometers of curated multibeam data from 1,238 cruises.

Click to Enable
Map Client