def ogr(self):
"Returns the OGR Geometry for this Geometry."
if self.srid:
try:
return gdal.OGRGeometry(self.wkb, self.srid)
except gdal.SRSException:
pass
return gdal.OGRGeometry(self.wkb)
def ogr(self):
"Returns the OGR Geometry for this Geometry."
if not gdal.HAS_GDAL:
raise GEOSException('GDAL required to convert to an OGRGeometry.')
if self.srid:
try:
return gdal.OGRGeometry(self.wkb, self.srid)
except gdal.SRSException:
pass
return gdal.OGRGeometry(self.wkb)
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.
"""
input_srid = None
if isinstance(geo_input, bytes):
geo_input = force_text(geo_input)
if isinstance(geo_input, str):
wkt_m = wkt_regex.match(geo_input)
if wkt_m:
# Handling WKT input.
if wkt_m.group('srid'):
input_srid = int(wkt_m.group('srid'))
g = wkt_r().read(force_bytes(wkt_m.group('wkt')))
elif hex_regex.match(geo_input):
# Handling HEXEWKB input.
g = wkb_r().read(force_bytes(geo_input))
elif json_regex.match(geo_input):
# Handling GeoJSON input.
g = wkb_r().read(gdal.OGRGeometry(geo_input).wkb)
else:
raise ValueError(
'String input unrecognized as WKT EWKT, and HEXEWKB.')
elif isinstance(geo_input, GEOM_PTR):
# When the input is a pointer to a geometry (GEOM_PTR).
g = geo_input
elif isinstance(geo_input, memoryview):
# 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' %
type(geo_input))
if not g:
raise GEOSException(
'Could not initialize GEOS Geometry with given input.')
input_srid = input_srid or capi.geos_get_srid(g) or None
if input_srid and srid and input_srid != srid:
raise ValueError('Input geometry already has SRID: %d.' %
input_srid)
# Setting the pointer object with a valid pointer.
self.ptr = g
# Post-initialization setup.
self._post_init(input_srid or srid)
def convert_from_gk25(north, east):
ps = "POINT (%f %f)" % (east, north)
g = gdal.OGRGeometry(ps, GK25_SRS)
if coord_transform:
g.transform(coord_transform)
return g
pnt = Point(east, north, srid=GK25_SRID)
if PROJECTION_SRID == GK25_SRID:
return pnt
pnt.transform(coord_transform)
return pnt
def transform(self, ct, clone=False):
"""
Requires GDAL. Transforms the geometry according to the given
transformation object, which may be an integer SRID, and WKT or
PROJ.4 string. By default, the geometry is transformed in-place and
nothing is returned. However if the `clone` keyword is set, then this
geometry will not be modified and a transformed clone will be returned
instead.
"""
srid = self.srid
if ct == srid:
# short-circuit where source & dest SRIDs match
if clone:
return self.clone()
else:
return
if not gdal.HAS_GDAL:
raise GEOSException(
"GDAL library is not available to transform() geometry.")
if isinstance(ct, gdal.CoordTransform):
# We don't care about SRID because CoordTransform presupposes
# source SRS.
srid = None
elif srid is None or srid < 0:
raise GEOSException(
"Calling transform() with no SRID set is not supported")
# Creating an OGR Geometry, which is then transformed.
g = gdal.OGRGeometry(self.wkb, srid)
g.transform(ct)
# Getting a new GEOS pointer
ptr = wkb_r().read(g.wkb)
if clone:
# User wants a cloned transformed geometry returned.
return GEOSGeometry(ptr, srid=g.srid)
if ptr:
# Reassigning pointer, and performing post-initialization setup
# again due to the reassignment.
capi.destroy_geom(self.ptr)
self.ptr = ptr
self._post_init(g.srid)
else:
raise GEOSException('Transformed WKB was invalid.')
def to_python(self, value):
if value in self.empty_values:
return None
# Work with a single GeoJSON geometry or a Feature. Avoid parsing
# overhead unless we have a true "Feature".
if '"Feature",' in value:
d = json.loads(value)
value = json.dumps(d.get('geometry'))
elif isinstance(value, collections.Mapping):
value = json.dumps(value.get('geometry') or value)
# Handle a comma delimited extent.
elif list(value).count(',') == 3:
value = Envelope(value.split(',')).polygon.ExportToWkt()
try:
geom = gdal.OGRGeometry(value)
except (gdal.OGRException, TypeError, ValueError):
raise forms.ValidationError(self.error_messages['invalid_geom'])
if not geom.srs:
geom.srid = self.srid or self.widget.map_srid
return geom
def to_python(self, value):
if value in self.empty_values:
return None
sref = None
# Work with a single GeoJSON geometry or a Feature.
value = json.loads(value) if '"Feature",' in value else value
if isinstance(value, collections.Mapping):
feat = sc.as_feature(value)
value = json.dumps(feat.get('geometry') or value)
sref = feat.srs
# Handle a comma delimited extent.
elif list(value).count(',') == 3:
value = Envelope(value.split(',')).polygon.ExportToWkt()
try:
geom = gdal.OGRGeometry(value, srs=getattr(sref, 'wkt', None))
except (gdal.OGRException, TypeError, ValueError):
raise forms.ValidationError(self.error_messages['invalid_geom'])
if not geom.srs:
geom.srid = self.srid or self.widget.map_srid
return geom
def ogr(self):
"Return the OGR Geometry for this Geometry."
return gdal.OGRGeometry(self._ogr_ptr(), self.srs)
