def __init__(self, geo_input, srid=None): """ The base constructor for GEOS geometry objects, and may take the following inputs: * strings: - WKT - HEXEWKB (a PostGIS-specific canonical form) - GeoJSON (requires GDAL) * buffer: - WKB The `srid` keyword is used to specify the Source Reference Identifier (SRID) number for this Geometry. If not set, the SRID will be None. """ if isinstance(geo_input, six.string_types): if isinstance(geo_input, six.text_type): # Encoding to ASCII, WKT or HEXEWKB doesn't need any more. geo_input = geo_input.encode('ascii') wkt_m = wkt_regex.match(geo_input) if wkt_m: # Handling WKT input. if wkt_m.group('srid'): srid = int(wkt_m.group('srid')) g = wkt_r().read(wkt_m.group('wkt')) elif hex_regex.match(geo_input): # Handling HEXEWKB input. g = wkb_r().read(geo_input) elif gdal.HAS_GDAL and json_regex.match(geo_input): # Handling GeoJSON input. g = wkb_r().read(gdal.OGRGeometry(geo_input).wkb) else: raise ValueError('String or unicode input unrecognized as WKT EWKT, and HEXEWKB.') elif isinstance(geo_input, GEOM_PTR): # When the input is a pointer to a geomtry (GEOM_PTR). g = geo_input elif isinstance(geo_input, buffer): # When the input is a buffer (WKB). g = wkb_r().read(geo_input) elif isinstance(geo_input, GEOSGeometry): g = capi.geom_clone(geo_input.ptr) else: # Invalid geometry type. raise TypeError('Improper geometry input type: %s' % str(type(geo_input))) if bool(g): # Setting the pointer object with a valid pointer. self.ptr = g else: raise GEOSException('Could not initialize GEOS Geometry with given input.') # Post-initialization setup. self._post_init(srid)