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Django WMS Framework

The Django WMS Framework is a toolkit that makes it easy to build a Web Map Service (WMS) or a x-y-z Tile Map Service. Rendering of both vector and raster data formats are supported.

For complete documentation please go to http://django-wms.readthedocs.org

Requirements

The processing of spatial data in django-wms relies on MapServer and its python bindings MapScript. Raster data integration depends on the django-raster package. The use of PostGIS as the database backend is required as well, for raster ntegration PostGIS >= 2.0 is required (see also django-raster package).

Installation

  1. Install package with pip install django-wms

  2. Add "wms" to your INSTALLED_APPS setting like this:

    INSTALLED_APPS = (
    ...
    'wms',
)

Example

To create a mapping service, subclass the django-wms layer, map and view classes and connect them to an existing model in django that has a spatial field (such as Point, Polygon or MultiPolygon). An example wms_config.py module could be specified as follows

### wms_config.py

# Load django-wms classes
from wms import maps, layers, views

# Load model with spatial field (Point, Polygon or MultiPolygon)
from myapp.models import MySpatialModel


# Subclass the WmsVectorLayer class and point it to a spatial model.
# Use WmsRasterLayer for rasters
class MyWmsLayer(layers.WmsVectorLayer):
    model = MySpatialModel

# Subclass the WmsMap class and add the layer to it
class MyWmsMap(maps.WmsMap):
    layer_classes = [ MyWmsLayer ]

# Subclass the WmsView to create a view for the map
class MyWmsView(views.WmsView):
    map_class = MyWmsMap

With the WmsView subclass in place, the only thing left to do to create a functional map service is to hook the view into a url. An example url configuration urls.py could be

### urls.py

# Import the wms view
from myproject.wms_config import MyWmsView

# Add url patterns to setup map services from the view
urlpatterns = patterns('',

    # This creates a WMS endpoint
    url(r'^wms/$', MyWmsView.as_view(), name='wms'),

    # This creates a TMS endpoint
    url(r'^tile/(?P<layers>[^/]+)/(?P<z>[0-9]+)/(?P<x>[0-9]+)/(?P<y>[0-9]+)(?P<format>\.jpg|\.png)$',
        MyWmsView.as_view(), name='tms'),
)

The django-wms package will automatically detect the first spatial field it can find in MySpatialModel and create a WMS endpoint from the class based view. If the three arguments x, y and z are found in the urlpattern, the view functions as TMS endpoint.