lizard-wms

Lizard-wms makes remote WMS layers accessible in Lizard.

Layers

When a layer has 'tijd' or 'Time' in the layer_name a time selection is possible.

Usage

You need both lizard-wms and lizard-maptree. The WMS sources are displayed in a tree using lizard-maptree, so add both to your settings' INSTALLED_APPS:

INSTALLED_APPS = [
    ...
    'lizard_wms',
    'lizard_maptree',
    ...
    ]

Include the following URL in your main urls.py:

(r'^webmap/', include('lizard_wms.urls')),

You don't need to separately include URLs from lizard-maptree.

After this, you can define WMS sources and/or WMS connections in the admin.

Note

The full documentation is available at http://doc.lizardsystem.nl/libs/lizard-wms/

Proxying WMS servers

It is possible to have lizard-wms act as a proxy for your WMS servers. This has three possible benefits:

• If a WMS source defined in lizard_wms has a DataSet, access to the source is restricted to users that have access to that DataSet. The proxy will also only work for logged in users that have access.
• The real URL of the WMS source is hidden. This can act as a form of 'security by obscurity'.
• If the real WMS server is on a private network and isn't reachable by the outside world, then this proxying can be part of a secure solution for showing its layers to the outside world.

To setup the proxying, two things are needed:

1. In the site's nginx.conf, an internal URL must be defined that redirects to the real WMS source. This URL is internal so that it can't be used by external browsers, only by the proxying mechanism:

   location /geoserver6/ {
       internal;
       proxy_pass http://geoserver6.lizard.net/geoserver;
   }
   

2. In the site's settings.py, a reverse mapping of same must be set:

   # Dictionary of domain names that can be handled by lizard-wms' WmsProxyView, that
   # redirects them to an internal URL defined in nginx.conf. Domains names are keys,
   # internal URLs are values.
   PROXIED_WMS_SERVERS = {
       'http://geoserver6.lizard.net/geoserver': '/geoserver6/',
   }
   

The result is that all WMS source URLs shown in Lizard (as workspace items) that start with 'http://geoserver6.lizard.net/geoserver' are instead shown as URLs going to the site itself (as in yourlizardsite.lizard.net/wms/proxy/1312/' for WMS source with id 1312). Internally, access to that WMS source is checked and if the user has access, an internal redirect to the real Geoserver follows that is invisible to the browser.