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In your main Metview folder now you should find a 'wms_tutorial' folder with the following contents (double-click to open):
Please note that because the WMS client requires internet access you might need to configure your network proxy settings in Metview. This can be done by selecting ‘Preferences’ from the menu in the toolbar of the Metview Desktop.
Please be aware that this tutorial is strongly dependent on the availability of the selected WMS services and that of the network itself. Therefore it cannot be not guaranteed that the exercises will work for you. Should you experience any WMS service related problems throughout the tutorial, you can still try out the icons provided in the ‘examples’ folder to see how the WMS client is working in Metview.
Part 1 – WMS basics
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A Web Map Service (WMS) is a standard protocol for serving georeferenced geo-referenced map images over the internet that are generated by a map server. The specification was developed and first published by the Open Geospatial Consortium[1] (OGC). WMS provides a way for different organisations to share graphical maps over the internet through specially constructed URLs.[2]
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A key concept of WMS is that of a layer representing a basic unit of geographical information that a WMS client can request as a map image from a WMS server.
In the WMS transaction the client sends (HTTP) requests to the server which on return sends back the requested information to the client. The WMS standard defines several request types, two of which have to be supported by any WMS servers:
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· GetMap: based on the specified parameters in the request (e.g. bounding box, geographic coordinate reference system, image size and format etc.), the server returns a map image for a selected layer that can be now visualised by the client.
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The Metview WMS client can perform both of this these request types enabling users to perform the following actions:
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