The General Bathymetric Chart of the Oceans’ (GEBCO) gridded bathymetric data sets are global terrain models for ocean and land. They are maintained and distributed by the British Oceanographic Data Centre (BODC) on behalf of GEBCO. The data sets include: GEBCO_2014 Grid — a global 30 arc-second interval grid; GEBCO One Minute Grid — a one arc-minute interval grid. (Last updated in 2008, please note that there are no plans for further development of this data set.);
The GEBCO_2014 Grid is available to download for user-defined areas in netCDF; Esri ASCII raster or INT16 GeoTiff formats. The GEBCO One Minute Grid is available in netCDF format only.
In netCDF format the grids are available as either two-dimensional (2D) or one-dimensional (1D) array grid files. The 2D array grids use the Climate and Forecast (CF) metadata conventions. You can download data for a user-defined area or the complete global grid. The 1D array grids are for use with GEBCO's Grid Display Software and GEBCO Digital Atlas (GDA) and so are only available as a global grid.