6.5. Handling Web Map Service data¶
Cesium supports adding additional imagery layer to the Earth map by using the OGC compliant Web Map Service (WMS). The 3D web client provides a simple widget panel which allows the user to easily add and remove arbitrary number of WMS layers. The widget panel  (marked in the following figure) can be expanded and collapsed by clicking on the Add WMS-Layer button on the widget panel.
In this example, a WMS imagery layer provided by the Vorarlberg State Government will be added to and displayed in the 3D web client. The following parameter values should be entered into the corresponding input fields:
- name: Vorarlberg_Aerial_Photography
- iconUrl: http://cdn.flaggenplatz.de/media/catalog/product/all/4489b.gif
- tootip: Vorarlberg Aerial Photography taken during the winter 2015
- url: http://vogis.cnv.at/mapserver/mapserv
- layers: wi2015_20cm
- additionalParameters: map=i_luftbilder_r_wms.map
- proxyUrl: /proxy/
As shown in the figure above, once the parameter settings have been completed, the WMS layer can be loaded by clicking on the Add WMS layer button  and its icon image together with its label name  will be listed on the BaseLayerPicker widget. You can use the Geocoder widget  to zoom the Earth map to the region of Vorarlberg state and check the added WMS layer. Clicking on the Remove WMS layer button , the WMS layer will be removed and substituted with the Bing Maps Aerial that is the first item listed on the BaseLayerPicker widget.