Global Multi-Resolution Topography Data Portal
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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, 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 other bathymetry from throughout the global and coastal oceans. As of June 2011 GMRT is part of the ocean map in Google Earth!
current version: GMRT 2.5