def __init__(self,
name,
datum,
vertical_cs=VerticalCS(),
geoid_model=None):
"""
Parameters
----------
name: str
The name of the Vertical CRS (e.g. NAVD88 height).
datum: Any
Anything accepted by :meth:`pyproj.crs.Datum.from_user_input`
vertical_cs: Any, optional
Input to create a Vertical Coordinate System accepted by
:meth:`pyproj.crs.CoordinateSystem.from_user_input`
or :class:`pyproj.crs.coordinate_system.VerticalCS`
geoid_model: str, optional
The name of the GEOID Model (e.g. GEOID12B).
"""
vert_crs_json = {
"$schema":
"https://proj.org/schemas/v0.2/projjson.schema.json",
"type":
"VerticalCRS",
"name":
name,
"datum":
Datum.from_user_input(datum).to_json_dict(),
"coordinate_system":
CoordinateSystem.from_user_input(vertical_cs).to_json_dict(),
}
if geoid_model is not None:
vert_crs_json["geoid_model"] = {"name": geoid_model}
super().__init__(vert_crs_json)
def __init__(
self,
name: str = "undefined",
datum: Any = "urn:ogc:def:datum:EPSG::6326",
ellipsoidal_cs: Any = None,
) -> None:
"""
Parameters
----------
name: str, optional
Name of the CRS. Default is undefined.
datum: Any, optional
Anything accepted by :meth:`pyproj.crs.Datum.from_user_input` or
a :class:`pyproj.crs.datum.CustomDatum`.
ellipsoidal_cs: Any, optional
Input to create an Ellipsoidal Coordinate System.
Anything accepted by :meth:`pyproj.crs.CoordinateSystem.from_user_input`
or an Ellipsoidal Coordinate System created from :ref:`coordinate_system`.
"""
geographic_crs_json = {
"$schema":
"https://proj.org/schemas/v0.2/projjson.schema.json",
"type":
"GeographicCRS",
"name":
name,
"datum":
Datum.from_user_input(datum).to_json_dict(),
"coordinate_system":
CoordinateSystem.from_user_input(
ellipsoidal_cs or Ellipsoidal2DCS()).to_json_dict(),
}
super().__init__(geographic_crs_json)
def _horizontal_datum_from_params(cf_params):
# step 1: build ellipsoid
ellipsoid = None
ellipsoid_name = cf_params.get("reference_ellipsoid_name")
try:
ellipsoid = CustomEllipsoid(
name=ellipsoid_name or "undefined",
semi_major_axis=cf_params.get("semi_major_axis"),
semi_minor_axis=cf_params.get("semi_minor_axis"),
inverse_flattening=cf_params.get("inverse_flattening"),
radius=cf_params.get("earth_radius"),
)
except CRSError:
if ellipsoid_name:
ellipsoid = Ellipsoid.from_name(ellipsoid_name)
# step 2: build prime meridian
prime_meridian = None
prime_meridian_name = cf_params.get("prime_meridian_name")
try:
prime_meridian = CustomPrimeMeridian(
name=prime_meridian_name or "undefined",
longitude=cf_params["longitude_of_prime_meridian"],
)
except KeyError:
if prime_meridian_name:
prime_meridian = PrimeMeridian.from_name(prime_meridian_name)
# step 3: build datum
datum_name = cf_params.get("horizontal_datum_name")
if ellipsoid or prime_meridian:
return CustomDatum(
name=datum_name or "undefined",
ellipsoid=ellipsoid or "WGS 84",
prime_meridian=prime_meridian or "Greenwich",
)
if datum_name:
return Datum.from_name(datum_name)
return None