A Web Map Service (WMS) of the General Bathymetric Chart of the Oceans' (GEBCO) global gridded bathymetric data set, the GEBCO_08 Grid, has been developed by BODC on behalf of the GEBCO community.
A WMS provides a means of accessing geo-referenced map images over the internet. These can be viewed in a web browser or a geographic Information System (GIS) and incorporated in your own web applications. To find out more follow these links
- Accessing the GEBCO WMS
- Supported service requests
- How can I view a WMS?
- GEBCO WMS — data sources
- Data set acknowledgement
To access the WMS, enter the following URL into your WMS client.
The following service requests are supported by the GEBCO WMS (version 1.1.1)
This returns information about the layers contained in the service, for example their content and geographic extent.
The following is a GetCapablities request that returns information in the form of an XML file (you may need to save to this to view the information).
This returns a map. Using the information given in the GetCapabilities request, the user can specify parameters such as the geographic extent of the map and the size of the returned image.
The following is an example GetMap request that returns an image of the bathymetry of the North Atlantic Ocean area from the GEBCO_08 Grid.
WMS are designed to allow imagery to be shared over the internet. Applications or software packages can access maps that are hosted on remote servers. This helps with ''mashups'', allowing users to compare and contrast data from a number of sources without having to physically hold the data on their own computers.
The GetMap request, defined above, 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, defined above, 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. For example Google Earth or ESRI ArcGIS Explorer and a number of Open Source GIS and mapping packages.
Please note that the quality of the viewed image may depend on how the software package interprets the WMS.
GEBCO is made up of an international group of experts who work on the development of a range of bathymetric data sets and products with the aim of providing the most authoritative publicily-available bathymetry for the world's oceans.
The GEBCO WMS is largely based on the GEBCO_08 Grid, a global bathymetric grid at 30 arc-second intervals. 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.
Within the GEBCO WMS, the imagery for the land areas is largely taken from the Blue Marble: Next Generation data set produced by Reto Stöckli, the US National Aeronautical and Space Administration's (NASA) Earth Observatory (NASA Goddard Space Flight Center). For the region south of 60°S, coastline information is taken from the Scientific Committee on Antarctic Research's (SCAR) Antarctic Digital Database.
This differs from the GEBCO_08 Grid where land areas are based on the NASA Shuttle Radar Topography Mission (SRTM30) data set.
The imagery used in the GEBCO WMS was developed from a terrain model of the GEBCO_08 Grid created using IVS 3D's Fledermaus software. Further image processing and inclusion of additional image layers such as the Blue Marble: Next Generation land imagery was carried out using Adobe Photoshop.
The methods and colour styling used in the generation of the GEBCO WMS image were developed for the creation of the GEBCO world map by Dr. Martin Jakobsson of Stockholm University, Sweden.
If imagery from the WMS is included in web sites, reports and digital and printed imagery then we request that the source be acknowledged in the form
"Imagery reproduced from the GEBCO_08 Grid, version 20100927, www.gebco.net"
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.
Related BODC links
|General Bathymetric Chart of the Oceans (GEBCO) at BODC||GEBCO Digital Atlas (GDA)|
|Access the GEBCO_08 Grid||BODC Web Services|
Related external links
|General Bathymetric Chart of the Oceans (GEBCO)||Scientific Committee on Antarctic Research (SCAR)|
|GEBCO world map||Antarctic Digital Database (ADD)|
|NASA's Blue Marble: Next Generation||Open Geospatial Consortium (OGC)|
|Shuttle Radar Topography Mission (SRTM30) data set||OGC Web Map Services (WMS)|