def from_wkt(cls, in_wkt_string):
"""Make a CRS from a WKT string
Parameters
----------
in_wkt_string : str
A WKT string.
Returns
-------
CRS
"""
if not is_wkt(in_wkt_string):
raise CRSError("Invalid WKT string: {}".format(in_wkt_string))
return cls(_from_string(in_wkt_string))
def from_proj4(cls, in_proj_string):
"""Make a CRS from a PROJ string
Parameters
----------
in_proj_string : str
A PROJ string.
Returns
-------
CRS
"""
if is_wkt(in_proj_string) or "=" not in in_proj_string:
raise CRSError("Invalid PROJ string: {}".format(in_proj_string))
return cls(_from_string(in_proj_string))
def from_wkt(in_wkt_string: str) -> "CRS":
"""
.. versionadded:: 2.2.0
Make a CRS from a WKT string
Parameters
----------
in_wkt_string : str
A WKT string.
Returns
-------
CRS
"""
if not is_wkt(in_wkt_string):
raise CRSError("Invalid WKT string: {}".format(in_wkt_string))
return CRS(_prepare_from_string(in_wkt_string))
def _from_string(in_crs_string):
if not in_crs_string:
raise CRSError("CRS is empty or invalid: {!r}".format(in_crs_string))
elif "{" in in_crs_string:
# may be json, try to decode it
try:
crs_dict = json.loads(in_crs_string, strict=False)
except ValueError:
raise CRSError("CRS appears to be JSON but is not valid")
if not crs_dict:
raise CRSError("CRS is empty JSON")
return _from_dict(crs_dict)
elif not is_wkt(in_crs_string) and "=" in in_crs_string:
# make sure the projection starts with +proj or +init
starting_params = ("+init", "+proj", "init", "proj")
if not in_crs_string.lstrip().startswith(starting_params):
kvpairs = []
first_item_inserted = False
for kvpair in in_crs_string.split():
if not first_item_inserted and (
kvpair.startswith(starting_params)):
kvpairs.insert(0, kvpair)
first_item_inserted = True
else:
kvpairs.append(kvpair)
in_crs_string = " ".join(kvpairs)
# make sure it is the CRS type
if "type=crs" not in in_crs_string:
if "+" in in_crs_string:
in_crs_string += " +type=crs"
else:
in_crs_string += " type=crs"
# look for EPSG, replace with epsg (EPSG only works
# on case-insensitive filesystems).
in_crs_string = in_crs_string.replace("+init=EPSG",
"+init=epsg").strip()
# remove no_defs as it does nothing as of PROJ 6.0.0 and breaks
# initialization with +init=epsg:...
in_crs_string = re.sub(r"\s\+?no_defs([\w=]+)?", "", in_crs_string)
return in_crs_string
