Note: this map is deprecated as the GEBCO_2014 grid has been replaced by the GEBCO_2019 grid. Please see the new GEBCO_2019 Basemap and GEBCO_2019 Bathymetric Contours (NOAA NCEI visualizations).This tiled map service displays bathymetric contours derived from the GEBCO_2014 grid, version 20150318 (http://www.gebco.net), which is a global bathymetry compilation at 30 arc-second resolution. Depths are displayed in meters. At large scales (1:5,000,000 and closer), the contour interval is 500m; at medium scales (1:5,000,000 to 1:30,000,000) the contour interval is 1000m; and at small scales (1:30,000,000 and greater), the contour interval is 2000m. Supplementary contours are shown in shallow waters (less than 500m).NOTE: Data from the GEBCO_2014 grid shall not be used for navigation or for any other purpose relating to safety at sea. The GEBCO_2014 Grid is largely based on a database of ship-track soundings with interpolation between soundings guided by satellite-derived gravity data. In some areas, data from existing grids are included. The GEBCO_2014 Grid does not contain detailed information in shallower water areas. Information concerning the generation of the grid can be found on GEBCO’s web site: http://www.gebco.net/data_and_products/gridded_bathymetry_data/. The GEBCO_2014 Grid is accompanied by a Source Identifier (SID) Grid which indicates which cells in the GEBCO_2014 Grid are based on soundings or existing grids and which have been interpolated. The latest version of both grids and accompanying documentation is available to download, on behalf of GEBCO, from the British Oceanographic Data Centre (BODC) https://www.bodc.ac.uk/data/online_delivery/gebco/. For NOAA/NCEI's color shaded-relief visualization of the GEBCO_2014 grid, please see: http://maps.ngdc.noaa.gov/arcgis/rest/services/web_mercator/gebco_2014_hillshade/MapServer (NOAA GeoPlatform link).See here for a map with both hillshade and contours included.
