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This may be of interest to people wanting a marine context layer to work with.

 

GEBCO are providing a WMS service of a map rendered from their global bathymetry data, which includes data provided by NIWA for the NZ region. Up until recently this has only worked in the +-180 space, which is of little use to people working around the 180 meridian. I have suggested they provide support for a 0-360 longitude space as well, and we have made some progress towards this. It is a bit fiddly, but at least NZ users can get a relevant map to use.

Information about the GEBCO WMS service is here: http://www.gebco.net/data_and_products/gebco_web_services/web_map_service/

You can see a map in your browser using this URL:

http://www.gebco.net/data_and_products/gebco_web_services/web_map_service/mapserv?request=getmap&service=wms&BBOX=0,-90,360,90&srs=EPSG:4326&format=image/png&layers=gebco_latest&width=900&height=600&version=1.1.1

 

To use successfully use this service in QGIS across 180, there are some limitations:

  • You should be using an EPSG:4326 projection in your map.
  • You MUST specify the WMS version to be 1.1.1

To use the service as a layer in your QGIS map:

(NIWA staff using the internal NIWA network must have the proxy server setup as described by Sadie below)

The service endpoint (URL) for QGIS to access the GEBCO WMS service is:

http://www.gebco.net/data_and_products/gebco_web_services/web_map_service/mapserv?version=1.1.1

 

  • Ensure the QGIS project CRS is set to EPSG:4326.
  • When you first connect to the service, the only visible layer (#1) is the +-180 one. with a name of "GEBCO_LATEST" & a title of "WMS for the GEBCO ..."
  • If you expand the list (click on the black triangle beside the 1), you'll see a second layer, named & titled "GEBCO_LATEST".
  • Select this layer, but before you add it to the map, click the "Change" bar to select the EPSG:4326 CRS for the service.
  • Then add it to the map.

 

This image shows NIWA climate stations (red dots from a public NIWA WFS service) overlaid on the GEBCO WMS layer added to QGIS as described above.


 

Troubleshooting for inexperienced players:

If you get an error message when trying to connect to this WMS service that the connection has timed out, and this is the first time that you have used a WMS service on QGIS, you will need to set up your network settings with the NIWA proxy details as below: