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Web Map Service (WMS)

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GEBCO WMS

Upcoming changes to the GEBCO WMS

On August 11th 2021 the GEBCO WMS layers have been updated to be based on the GEBCO_2021 Grid from the following service URL:

https://www.gebco.net/data_and_products/gebco_web_services/web_map_service/mapserv?

Previous versions of the GEBCO WMS layers will continue to be made available.


GEBCO WMS

The GEBCO grid is available as a Web Map Service (WMS), a means of accessing geo-referenced map images over the internet. These maps can be viewed in a web browser or Geographic Information System (GIS) and incorporated in your own web application.

GEBCO WMS

Layers are available for the latest GEBCO grid, GEBCO_2021, as a shaded relief image or 'flat' map and the GEBCO Type Identifier (TID) grid. These layers can be viewed in a web browser or Geographic Information System (GIS) and incorporated in your own web application.

Accessing the WMS for the GEBCO Grid

To access the GEBCO WMS, enter the following address into your WMS client:

https://www.gebco.net/data_and_products/gebco_web_services/web_map_service/mapserv?

Supported service requests

GetCapabilities

This request returns information about the layers contained in the service, for example, their content and geographic extent. The information is returned in the form of a XML file (you may need to save this to disk to view the information).

The following links provide access to example GetCapabilities calls to GEBCO's WMS.

GetMap

This request returns a map. Using the information given in the GetCapabilities request, the user can specify parameters such as the required layer, the geographic extent of the map and the size of the returned image.

Please note that the longitude range for the global WMS extends from -180 to 360 degrees to allow plotting centred on 180 degrees.

The following are example GetMap requests for GEBCO's WMS.

GEBCO_2021 Grid - with ice surface elevation information

  • WMS 1.3.0 GetMap request for the global GEBCO Grid displayed as a shaded relief image
  • WMS 1.3.0 GetMap request for the global GEBCO Grid displayed as a 'flat map' image, colour-coded for elevation
  • WMS 1.3.0 GetMap request for the global GEBCO Grid displayed as a 'flat map' image, colour-coded for elevation, showing areas based on measured data only

GEBCO_2021 Grid - with sub-ice topography/bathymetry information

  • WMS 1.3.0 GetMap request for the global GEBCO Grid displayed as a shaded relief image

GEBCO_2021 Type Identifier (TID) Grid

  • WMS 1.3.0 GetMap request for the global TID Grid - grid cells based on measured data shown in black
  • WMS 1.3.0 GetMap request for the global TID Grid - grid cells colour-coded by TID value

How can I view a WMS?

WMS are designed to allow imagery to be shared over the internet, i.e. within your own application or software package you can access a map hosted on a remote server.

The GetMap request can be used to view a WMS in a web browser. Just cut and paste this URL into your browser to view the WMS image; changing the BBOX values alters the geographic extent of the area viewed.

The GetCapabilities request provides information about the image layers contained in the WMS.

There are a number of commercial and free GIS and mapping-type packages in which you can view WMS.

Please note that the quality of the viewed image may depend on how the software package interprets the WMS.

Data sources and WMS development

The GEBCO WMS is largely based on the latest GEBCO Grid. The grid is based on a database of ship-track soundings with interpolation between soundings guided by satellite-derived gravity data. However, in regions where they improve on the existing grid, data sets generated by other methods are included.

Further information can be found in the documentation that accompanies the data set.

Access previous GEBCO WMS layers

Find out how to access WMS layers for previous GEBCO grid releases.

Data set acknowledgement

If imagery from the WMS is included in web sites, reports and digital and printed imagery then we request that the source of the data set is acknowledged and be of the form

"Imagery reproduced from the GEBCO_2021 Grid, GEBCO Compilation Group (2021) GEBCO 2021 Grid (doi:10.5285/c6612cbe-50b3-0cff-e053-6c86abc09f8f)"

Disclaimer

GEBCO's WMS have been developed and made available, on behalf of GEBCO, by the British Oceanographic Data Centre (BODC).

Whilst every effort has been made to make sure that the imagery is as error free as possible, BODC and GEBCO give no warranty as to the quality, accuracy or completeness of the imagery contained within this WMS or to the non-interruption or continuation of the service. Furthermore we can give no warranty that this WMS is compatible with any other data with which the material is to be used.

The imagery within this WMS should not be used for navigation or for any purpose relating to safety at sea.

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