WMS

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Revision as of 08:30, 14 August 2012 by FBO (Talk | contribs) (WMS Server)

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A Web Map Service (WMS) is a standard protocol for serving georeferenced map images over the Internet. The images are generated by a map server using data from a GIS database. (taken from the Wikipedia Article.)

Hint.jpg WMS requires a georeferenced map. Choose the Scale and Coordinate System command from the Map menu to set the map scale and a coordinate system. Real world coordinates do not have to be necessarily defined. They can be left at (0/0) for example.

To set up a map from a WMS server choose the WMS - Web Map Service command from the Background Map menu. The WMS - Web Map Service dialog appears.

WMSDialog1.PNG

WMS Server

The WMS servers are listed in the upper box of the WMS - Web Map Service dialog.

Add a WMS Server

  1. Click the Add button.
  2. The Add WMS Server dialog appears.
  3. Enter the Name of the server, the URL, the Version and, if required, a Login with Password, the Token Server URL and a Key.
    AddWMSServer.PNG
  4. Click the OK button when finished.
  5. The WMS server appears in the WMS server box.

Connect to a WMS Server

Select a WMS server from the list and click Connect. If the connection was successful, OCAD gets a list from the server with the available layers. These layers are listed in the WMS layer table of the WMS - Web Map Service dialog. Read the WMS Layer article to learn how to use layers as Background Maps.

WMSDialog2.PNG

Edit WMS Server Properties

Select a WMS server and click the Edit button to edit its properties. The Edit WMS Server Properties dialog appears which is equal to the Add WMS Server dialog.

EditWMSServerProperties.png


Remove a WMS Server

Click Remove to remove the selected WMS server from the list.

WMS Layer

After connecting to a WMS server the available WMS layers are listed in the WMS layer box. The Image format can be chosen if a layer is selected.

Hint.jpg Web Map Services generally provide their images in multiple spatial reference systems. OCAD can only access to WMS if the OCAD maps' coordinate system (ex. Swiss Grid CH1903) is supported by the WMS. Then the Spatial reference system is automatically set to the corresponding EPSG code.


Add Selected Layers as WMS Layers to Background Maps (Online)

Select a WMS layer in the list, choose an image format and click Add selected layers as WMS layers to background maps (online)


Add Current View of Selected Layers to Background Maps (Offline)

Select a WMS layer in the list, choose an image format and click Add current view of selected layers to background maps (offline).

WMS2.png


Close the dialog box. You can manage the view by choosing Manage from the Background Map menu.

WMS3.png

One possibility to display the map:

WMS4.png