Requests
WMS specifies a number of different request types, two of which are required by any WMS server:
- GetCapabilities - returns parameters about the WMS (such as map image format and WMS version compatibility) and the available layers (map bounding box, coordinate reference systems, URI of the data and whether the layer is mostly opaque or not)
- GetMap - returns a map image. Parameters include: width and height of the map, coordinate reference system, rendering style, image format
Request types that WMS providers may optionally support include:
- GetFeatureInfo - if a layer is marked as 'queryable' then you can request data about a coordinate of the map image.
- DescribeLayer
- GetLegendGraphic - return an image of the map's legend image, giving a visual guide to map elements
Read more about this topic: Web Map Service
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