--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/app/django/contrib/gis/db/backend/postgis/models.py	Tue Oct 14 16:00:59 2008 +0000
@@ -0,0 +1,69 @@
+"""
+ The GeometryColumns and SpatialRefSys models for the PostGIS backend.
+"""
+from django.db import models
+from django.contrib.gis.models import SpatialRefSysMixin
+
+# Checking for the presence of GDAL (needed for the SpatialReference object)
+from django.contrib.gis.gdal import HAS_GDAL
+if HAS_GDAL:
+    from django.contrib.gis.gdal import SpatialReference
+
+class GeometryColumns(models.Model):
+    """
+    The 'geometry_columns' table from the PostGIS. See the PostGIS
+    documentation at Ch. 4.2.2.
+    """
+    f_table_catalog = models.CharField(max_length=256)
+    f_table_schema = models.CharField(max_length=256)
+    f_table_name = models.CharField(max_length=256)
+    f_geometry_column = models.CharField(max_length=256)
+    coord_dimension = models.IntegerField()
+    srid = models.IntegerField(primary_key=True)
+    type = models.CharField(max_length=30)
+
+    class Meta:
+        db_table = 'geometry_columns'
+
+    @classmethod
+    def table_name_col(cls):
+        """
+        Returns the name of the metadata column used to store the 
+        the feature table name.
+        """
+        return 'f_table_name'
+
+    @classmethod
+    def geom_col_name(cls):
+        """
+        Returns the name of the metadata column used to store the 
+        the feature geometry column.
+        """
+        return 'f_geometry_column'
+
+    def __unicode__(self):
+        return "%s.%s - %dD %s field (SRID: %d)" % \
+               (self.f_table_name, self.f_geometry_column,
+                self.coord_dimension, self.type, self.srid)
+
+class SpatialRefSys(models.Model, SpatialRefSysMixin):
+    """
+    The 'spatial_ref_sys' table from PostGIS. See the PostGIS
+    documentaiton at Ch. 4.2.1.
+    """
+    srid = models.IntegerField(primary_key=True)
+    auth_name = models.CharField(max_length=256)
+    auth_srid = models.IntegerField()
+    srtext = models.CharField(max_length=2048)
+    proj4text = models.CharField(max_length=2048)
+
+    class Meta:
+        db_table = 'spatial_ref_sys'
+
+    @property
+    def wkt(self):
+        return self.srtext
+
+    @classmethod
+    def wkt_col(cls):
+        return 'srtext'