Listing projection(s) from a WMS server

The Web Mapping Service (WMS), which can be found at https://en.wikipedia.org/wiki/Web_Map_Service, is fun since most service providers provide data in several coordinate systems and you can then specify which one you would like. However, you can't reproject or transform the WMS into some other system that the service provider does not provide, which means that you can only use the coordinate system that is provided. The following is an example of a WMS getCapabilities request (http://gis.ktn.gv.at/arcgis/services/INSPIRE/INSPIRE/MapServer/WmsServer?service=wms&version=1.3.0&request=getcapabilities), showing a list of the five available coordinate systems from a WMS service:

Getting ready

The WMS service URL that we will use is http://ogc.bgs.ac.uk/cgi-bin/BGS_1GE_Geology/wms?service=WMS&version=1.3.0&request=GetCapabilities. This is from the British Geological Survey, titled OneGeology Europe geology.

Tip

For a list of WMS servers...