Ocean Basemap

Collection: World

Map Service Name: Ocean_Basemap

Description: This map is designed to be used as a basemap by marine GIS professionals and as a reference map by anyone interested in ocean data. The basemap includes bathymetry, marine water body names, undersea feature names, and derived depth values in meters. Land features include administrative boundaries, cities, inland waters and roads overlaid on land cover and shaded relief imagery.

The map was compiled from a variety of best available sources from several data providers, including General Bathymetric Chart of the Oceans GEBCO_08 Grid and IHO-IOC GEBCO Gazetteer of Undersea Feature Names, August 2010 version (http://www.gebco.net); National Oceanic and Atmospheric Administration (NOAA); National Geographic; DeLorme; and Esri. The basemap was designed and developed by Esri.

The basemap currently provides coverage for the world down to a scale of ~1:1,000,000. US coastal waters use bathymetric data derived from NOAA survey point data at 1:1,000,000 scale.

Note:

Data from the GEBCO_08 grid shall not to be used for navigation or for any other purpose relating to safety at sea. The GEBCO_08 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 is included. The GEBCO_08 Grid does not contain detailed information in shallower water areas. Information concerning the generation of the grid can be found on GEBCO's website: http://www.gebco.net/data_and_products/gridded_bathymetry_data/. The GEBCO_08 Grid is accompanied by a Source Identifier (SID) Grid that indicates which cells in the GEBCO_08 Grid are based on soundings or existing grids and which have been interpolated. The latest version of both grids and accompanying documentation are available to download, on behalf of GEBCO, from the British Oceanographic Data Centre (BODC): https://www.bodc.ac.uk/data/online_delivery/gebco/.

The names of the IHO (International Hydrographic Organization), IOC (Intergovernmental Oceanographic Commission), GEBCO (General Bathymetric Chart of the Oceans), NERC (Natural Environment Research Council), or BODC may not be used in any way to imply, directly or otherwise, endorsement or support of either the licensee or their mapping system.

Attribution: Sources: GEBCO, NOAA, National Geographic, DeLorme, and Esri

Coordinate System: WGS 1984 Web Mercator (Auxiliary Sphere)

Units of Measure: esriMeters

Extent:

• XMin: -20037508.2314698
• YMin: -19971868.8804086
• XMax: 20037508.2314698
• YMax: 19971868.8804086

Spatial Reference: 102100 (3857)

Map DPI: 96

Tile Size of Map Cache: 256 pixels by 256 pixels

Map Service Data Format: Map server cache in JPEG format

Map Service Size: 1.42 GB

Map Service Size on Disk: 1.42 GB

Map Service Number of Files: 78

Cached Map Scales:

• 1:591,657,527.591555
• 1:295,828,763.795777
• 1:147,914,381.897889
• 1:73,957,190.948944
• 1:36,978,595.474472
• 1:18,489,297.737236
• 1:9,244,648.868618
• 1:4,622,324.434309
• 1:2,311,162.217155
• 1:1,155,581.108577