app/django/contrib/gis/utils/srs.py
author Sverre Rabbelier <srabbelier@gmail.com>
Tue, 02 Dec 2008 17:59:44 +0000
changeset 647 355ac73823a1
parent 323 ff1a9aa48cfd
permissions -rw-r--r--
Swap order of merged params to fix sponsor select view The sponsor select view (in 'create new program') was showing the wrong information (and also using the wrong list template) because the order in which the params were merged was wrong way around. This fixes that and at the same time fixes the 'instruction_text' attribute, which should be named 'list_description' instead. At the same time we lookup and set Sponsor as the scope of the newly created program. Patch by: Sverre Rabbelier

def add_postgis_srs(srs):
    """
    This function takes a GDAL SpatialReference system and adds its
    information to the PostGIS `spatial_ref_sys` table -- enabling
    spatial transformations with PostGIS.  This is handy for adding
    spatial reference systems not included by default with PostGIS.  
    For example, the following adds the so-called "Google Maps Mercator 
    Projection" (available in GDAL 1.5):
    
    >>> add_postgis_srs(SpatialReference(900913))

    Note: By default, the `auth_name` is set to 'EPSG' -- this should
    probably be changed.
    """
    from django.contrib.gis.models import SpatialRefSys
    from django.contrib.gis.gdal import SpatialReference

    if not isinstance(srs, SpatialReference):
        srs = SpatialReference(srs)

    if srs.srid is None:
        raise Exception('Spatial reference requires an SRID to be compatible with PostGIS.')
   
    # Creating the spatial_ref_sys model.
    sr, created = SpatialRefSys.objects.get_or_create(
        srid=srs.srid, auth_name='EPSG', auth_srid=srs.srid, 
        srtext=srs.wkt, proj4text=srs.proj4)