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from django.contrib.gis import gdal class SpatialRefSysMixin: """ The SpatialRefSysMixin is a class used by the database-dependent SpatialRefSys objects to reduce redundant code. """ @property def srs(self): """ Return a GDAL SpatialReference object. """ # TODO: Is caching really necessary here? Is complexity worth it? if hasattr(self, '_srs'): # Returning a clone of the cached SpatialReference object. return self._srs.clone() else: # Attempting to cache a SpatialReference object. # Trying to get from WKT first. try: self._srs = gdal.SpatialReference(self.wkt) return self.srs except Exception as e: msg = e try: self._srs = gdal.SpatialReference(self.proj4text) return self.srs except Exception as e: msg = e raise Exception('Could not get OSR SpatialReference from WKT: %s\nError:\n%s' % (self.wkt, msg)) @property def ellipsoid(self): """ Return a tuple of the ellipsoid parameters: (semimajor axis, semiminor axis, and inverse flattening). """ return self.srs.ellipsoid @property def name(self): "Return the projection name." return self.srs.name @property def spheroid(self): "Return the spheroid name for this spatial reference." return self.srs['spheroid'] @property def datum(self): "Return the datum for this spatial reference." return self.srs['datum'] @property def projected(self): "Is this Spatial Reference projected?" return self.srs.projected @property def local(self): "Is this Spatial Reference local?" return self.srs.local @property def geographic(self): "Is this Spatial Reference geographic?" return self.srs.geographic @property def linear_name(self): "Return the linear units name." return self.srs.linear_name @property def linear_units(self): "Return the linear units." return self.srs.linear_units @property def angular_name(self): "Return the name of the angular units." return self.srs.angular_name @property def angular_units(self): "Return the angular units." return self.srs.angular_units @property def units(self): "Return a tuple of the units and the name." if self.projected or self.local: return (self.linear_units, self.linear_name) elif self.geographic: return (self.angular_units, self.angular_name) else: return (None, None) @classmethod def get_units(cls, wkt): """ Return a tuple of (unit_value, unit_name) for the given WKT without using any of the database fields. """ return gdal.SpatialReference(wkt).units @classmethod def get_spheroid(cls, wkt, string=True): """ Class method used by GeometryField on initialization to retrieve the `SPHEROID[..]` parameters from the given WKT. """ srs = gdal.SpatialReference(wkt) sphere_params = srs.ellipsoid sphere_name = srs['spheroid'] if not string: return sphere_name, sphere_params else: # `string` parameter used to place in format acceptable by PostGIS if len(sphere_params) == 3: radius, flattening = sphere_params[0], sphere_params[2] else: radius, flattening = sphere_params return 'SPHEROID["%s",%s,%s]' % (sphere_name, radius, flattening) def __str__(self): """ Return the string representation, a 'pretty' OGC WKT. """ return str(self.srs)