Global Multi-Resolution Topography Data Synthesis
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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 MGDS 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.
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GMRT v3.3 was released in January 2017 and includes 2,973,071 miles of data from 931 cruises.