Viewing Properties

Viewing Properties

Once you have added a WMS server, you can view its properties by right-clicking on it in the legend, and selecting Properties. <P> Metadata Tab<A NAME="sec:ogc-wms-properties-metadata"></A><A NAME="146"></A> <A NAME="147"></A> <A NAME="148"></A> <P> The Metadata tab displays a wealth of information about the WMS server, generally collected from the Capabilities statement returned from that server. <P> Many definitions can be gleaned by reading the WMS standards [#!OGCWMS010101web!#], [#!OGCWMS010300web!#], but here are a few handy definitions: <P>

• Server Properties <P>
  • WMS Version - The WMS version supported by the server. <P>
  • Image Formats - The list of MIME-types the server can respond with when drawing the map. QGIS supports whatever formats the underlying Qt libraries were built with, which is typically at least image/png and image/jpeg. <P>
  • Identity Formats - The list of MIME-types the server can respond with when you use the Identify tool. Currently QGIS supports the text-plain type. <P>

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• Layer Properties <P>
  • Selected - Whether or not this layer was selected when its server was added to this project. <P>
  • Visible - Whether or not this layer is selected as visible in the legend. (Not yet used in this version of QGIS.) <P>
  • Can Identify - Whether or not this layer will return any results when the Identify tool is used on it. <P>
  • Can be Transparent - Whether or not this layer can be rendered with transparency. This version of QGIS will always use transparency if this is Yes and the image encoding supports transparency . <P>
  • Can Zoom In - Whether or not this layer can be zoomed in by the server. This version of QGIS assumes all WMS layers have this set to Yes. Deficient layers may be rendered strangely. <P>
  • Cascade Count - WMS servers can act as a proxy to other WMS servers to get the raster data for a layer. This entry shows how many times the request for this layer is forwarded to peer WMS servers for a result. <P>
  • Fixed Width, Fixed Height - Whether or not this layer has fixed source pixel dimensions. This version of QGIS assumes all WMS layers have this set to nothing. Deficient layers may be rendered strangely. <P>
  • WGS 84 Bounding Box - The bounding box of the layer, in WGS 84 coordinates. Some WMS servers do not set this correctly (e.g. UTM coordinates are used instead). If this is the case, then the initial view of this layer may be rendered with a very ``zoomed-out appearance by QGIS. The WMS webmaster should be informed of this error, which they may know as the WMS XML elements LatLonBoundingBox, EX_GeographicBoundingBox or the CRS:84 BoundingBox. <P>
  • Available in CRS - The projections that this layer can be rendered in by the WMS server. These are listed in the WMS-native format. <P>
  • Available in style - The image styles that this layer can be rendered in by the WMS server. <P>

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