70 lines
2.1 KiB
Python
70 lines
2.1 KiB
Python
"""
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The GeometryColumns and SpatialRefSys models for the PostGIS backend.
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"""
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from django.db import models
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from django.contrib.gis.models import SpatialRefSysMixin
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# Checking for the presence of GDAL (needed for the SpatialReference object)
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from django.contrib.gis.gdal import HAS_GDAL
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if HAS_GDAL:
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from django.contrib.gis.gdal import SpatialReference
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class GeometryColumns(models.Model):
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"""
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The 'geometry_columns' table from the PostGIS. See the PostGIS
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documentation at Ch. 4.2.2.
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"""
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f_table_catalog = models.CharField(max_length=256)
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f_table_schema = models.CharField(max_length=256)
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f_table_name = models.CharField(max_length=256)
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f_geometry_column = models.CharField(max_length=256)
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coord_dimension = models.IntegerField()
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srid = models.IntegerField(primary_key=True)
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type = models.CharField(max_length=30)
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class Meta:
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db_table = 'geometry_columns'
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@classmethod
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def table_name_col(cls):
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"""
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Returns the name of the metadata column used to store the
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the feature table name.
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"""
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return 'f_table_name'
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@classmethod
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def geom_col_name(cls):
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"""
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Returns the name of the metadata column used to store the
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the feature geometry column.
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"""
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return 'f_geometry_column'
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def __unicode__(self):
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return "%s.%s - %dD %s field (SRID: %d)" % \
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(self.f_table_name, self.f_geometry_column,
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self.coord_dimension, self.type, self.srid)
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class SpatialRefSys(models.Model, SpatialRefSysMixin):
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"""
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The 'spatial_ref_sys' table from PostGIS. See the PostGIS
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documentaiton at Ch. 4.2.1.
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"""
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srid = models.IntegerField(primary_key=True)
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auth_name = models.CharField(max_length=256)
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auth_srid = models.IntegerField()
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srtext = models.CharField(max_length=2048)
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proj4text = models.CharField(max_length=2048)
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class Meta:
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db_table = 'spatial_ref_sys'
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@property
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def wkt(self):
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return self.srtext
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@classmethod
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def wkt_col(cls):
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return 'srtext'
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