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test_crs_cf.py
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test_crs_cf.py
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import numpy
import pytest
from numpy.testing import assert_almost_equal
from packaging import version
from pyproj import CRS
from pyproj.crs import ProjectedCRS
from pyproj.crs._cf1x8 import _try_list_if_string
from pyproj.crs.coordinate_operation import (
LambertAzimuthalEqualAreaConversion,
LambertCylindricalEqualAreaConversion,
MercatorAConversion,
OrthographicConversion,
PolarStereographicAConversion,
PolarStereographicBConversion,
SinusoidalConversion,
StereographicConversion,
VerticalPerspectiveConversion,
)
from pyproj.exceptions import CRSError
from test.conftest import PROJ_GTE_901, PROJ_LOOSE_VERSION
def _to_dict(operation):
param_dict = {}
for param in operation.params:
param_dict[param.name] = param.value
return param_dict
def _test_roundtrip(expected_cf, wkt_startswith):
crs = CRS.from_cf(expected_cf)
cf_dict = crs.to_cf()
assert cf_dict.pop("crs_wkt").startswith(wkt_startswith)
assert_almost_equal(
cf_dict.pop("semi_minor_axis"), expected_cf.pop("semi_minor_axis")
)
assert_almost_equal(
cf_dict.pop("inverse_flattening"), expected_cf.pop("inverse_flattening")
)
if "towgs84" in expected_cf:
assert_almost_equal(cf_dict.pop("towgs84"), expected_cf.pop("towgs84"))
assert cf_dict == expected_cf
def test_cf_from_numpy_dtypes():
cf = {
"grid_mapping_name": "lambert_conformal_conic",
"standard_parallel": numpy.array([60, 30], dtype="f4"),
"longitude_of_central_meridian": numpy.float32(0),
"latitude_of_projection_origin": numpy.int32(45),
}
crs = CRS.from_cf(cf)
with pytest.warns(UserWarning):
assert crs.to_dict() == {
"datum": "WGS84",
"lat_0": 45,
"lat_1": 60,
"lat_2": 30,
"lon_0": 0,
"no_defs": None,
"proj": "lcc",
"type": "crs",
"units": "m",
"x_0": 0,
"y_0": 0,
}
def test_to_cf_transverse_mercator():
crs = CRS(
proj="tmerc",
lat_0=0,
lon_0=15,
k=0.9996,
x_0=2520000,
y_0=0,
ellps="intl",
units="m",
towgs84="-122.74,-34.27,-22.83,-1.884,-3.400,-3.030,-15.62",
)
towgs84_test = [-122.74, -34.27, -22.83, -1.884, -3.4, -3.03, -15.62]
horizontal_datum_name = (
"Unknown based on International 1924 (Hayford 1909, 1910) ellipsoid"
)
if PROJ_GTE_901:
horizontal_datum_name = (
f"{horizontal_datum_name} using "
"towgs84=-122.74,-34.27,-22.83,-1.884,-3.400,-3.030,-15.62"
)
expected_cf = {
"semi_major_axis": 6378388.0,
"semi_minor_axis": crs.ellipsoid.semi_minor_metre,
"inverse_flattening": 297.0,
"reference_ellipsoid_name": "International 1924 (Hayford 1909, 1910)",
"longitude_of_prime_meridian": 0.0,
"prime_meridian_name": "Greenwich",
"horizontal_datum_name": horizontal_datum_name,
"towgs84": towgs84_test,
"grid_mapping_name": "transverse_mercator",
"latitude_of_projection_origin": 0.0,
"longitude_of_central_meridian": 15.0,
"false_easting": 2520000.0,
"false_northing": 0.0,
"scale_factor_at_central_meridian": 0.9996,
"geographic_crs_name": "unknown",
"projected_crs_name": "unknown",
}
cf_dict = crs.to_cf()
assert cf_dict.pop("crs_wkt").startswith("BOUNDCRS[")
assert cf_dict == expected_cf
# test roundtrip
_test_roundtrip(expected_cf, "BOUNDCRS[")
# test coordinate system
assert crs.cs_to_cf() == [
{
"axis": "X",
"long_name": "Easting",
"standard_name": "projection_x_coordinate",
"units": "metre",
},
{
"axis": "Y",
"long_name": "Northing",
"standard_name": "projection_y_coordinate",
"units": "metre",
},
]
with pytest.warns(UserWarning):
assert crs.to_dict() == {
"proj": "tmerc",
"lat_0": 0,
"lon_0": 15,
"k": 0.9996,
"x_0": 2520000,
"y_0": 0,
"ellps": "intl",
"towgs84": towgs84_test,
"units": "m",
"no_defs": None,
"type": "crs",
}
@pytest.mark.parametrize(
"towgs84_test",
[
(-122.74, -34.27, -22.83, -1.884, -3.4, -3.03, -15.62),
"-122.74, -34.27, -22.83, -1.884, -3.4, -3.03, -15.62",
],
)
def test_from_cf_transverse_mercator(towgs84_test):
crs = CRS.from_cf(
{
"grid_mapping_name": "transverse_mercator",
"latitude_of_projection_origin": 0,
"longitude_of_central_meridian": 15,
"false_easting": 2520000,
"false_northing": 0,
"reference_ellipsoid_name": "intl",
"towgs84": towgs84_test,
}
)
expected_cf = {
"semi_major_axis": 6378388.0,
"semi_minor_axis": crs.ellipsoid.semi_minor_metre,
"inverse_flattening": 297.0,
"reference_ellipsoid_name": "International 1924 (Hayford 1909, 1910)",
"longitude_of_prime_meridian": 0.0,
"prime_meridian_name": "Greenwich",
"grid_mapping_name": "transverse_mercator",
"latitude_of_projection_origin": 0.0,
"longitude_of_central_meridian": 15.0,
"false_easting": 2520000.0,
"false_northing": 0.0,
"scale_factor_at_central_meridian": 1.0,
"geographic_crs_name": "undefined",
"projected_crs_name": "undefined",
"horizontal_datum_name": "undefined",
}
cf_dict = crs.to_cf()
assert cf_dict.pop("crs_wkt").startswith("BOUNDCRS[")
assert_almost_equal(cf_dict.pop("towgs84"), _try_list_if_string(towgs84_test))
assert cf_dict == expected_cf
# test roundtrip
expected_cf["towgs84"] = _try_list_if_string(towgs84_test)
_test_roundtrip(expected_cf, "BOUNDCRS[")
# test coordinate system
assert crs.cs_to_cf() == [
{
"axis": "X",
"long_name": "Easting",
"standard_name": "projection_x_coordinate",
"units": "metre",
},
{
"axis": "Y",
"long_name": "Northing",
"standard_name": "projection_y_coordinate",
"units": "metre",
},
]
def test_cf_from_latlon():
crs = CRS.from_cf(
dict(
grid_mapping_name="latitude_longitude",
semi_major_axis=6378137.0,
inverse_flattening=298.257223,
)
)
expected_cf = {
"semi_major_axis": 6378137.0,
"semi_minor_axis": crs.ellipsoid.semi_minor_metre,
"inverse_flattening": crs.ellipsoid.inverse_flattening,
"longitude_of_prime_meridian": 0.0,
"prime_meridian_name": "Greenwich",
"grid_mapping_name": "latitude_longitude",
"geographic_crs_name": "undefined",
"reference_ellipsoid_name": "undefined",
}
cf_dict = crs.to_cf()
assert cf_dict.pop("crs_wkt").startswith("GEOGCRS[")
assert cf_dict == expected_cf
# test roundtrip
_test_roundtrip(expected_cf, "GEOGCRS[")
# test coordinate system
assert crs.cs_to_cf() == [
{
"standard_name": "longitude",
"long_name": "longitude coordinate",
"units": "degrees_east",
"axis": "X",
},
{
"standard_name": "latitude",
"long_name": "latitude coordinate",
"units": "degrees_north",
"axis": "Y",
},
]
def test_cf_from_latlon__named():
crs = CRS.from_cf(dict(spatial_ref="epsg:4326"))
expected_cf = {
"semi_major_axis": 6378137.0,
"semi_minor_axis": crs.ellipsoid.semi_minor_metre,
"inverse_flattening": crs.ellipsoid.inverse_flattening,
"reference_ellipsoid_name": "WGS 84",
"longitude_of_prime_meridian": 0.0,
"prime_meridian_name": "Greenwich",
"geographic_crs_name": "WGS 84",
"grid_mapping_name": "latitude_longitude",
}
cf_dict = crs.to_cf()
assert cf_dict.pop("crs_wkt").startswith("GEOGCRS[")
assert cf_dict == expected_cf
# test roundtrip
_test_roundtrip(expected_cf, "GEOGCRS[")
def test_cf_from_utm():
crs = CRS.from_cf(dict(crs_wkt="epsg:32615"))
expected_cf = {
"semi_major_axis": 6378137.0,
"semi_minor_axis": crs.ellipsoid.semi_minor_metre,
"inverse_flattening": crs.ellipsoid.inverse_flattening,
"reference_ellipsoid_name": "WGS 84",
"longitude_of_prime_meridian": 0.0,
"prime_meridian_name": "Greenwich",
"geographic_crs_name": "WGS 84",
"horizontal_datum_name": "World Geodetic System 1984 ensemble",
"projected_crs_name": "WGS 84 / UTM zone 15N",
"grid_mapping_name": "transverse_mercator",
"latitude_of_projection_origin": 0.0,
"longitude_of_central_meridian": -93.0,
"false_easting": 500000.0,
"false_northing": 0.0,
"scale_factor_at_central_meridian": 0.9996,
}
cf_dict = crs.to_cf()
assert cf_dict.pop("crs_wkt").startswith("PROJCRS[")
assert cf_dict == expected_cf
# test roundtrip
_test_roundtrip(expected_cf, "PROJCRS[")
# test coordinate system
assert crs.cs_to_cf() == [
{
"axis": "X",
"long_name": "Easting",
"standard_name": "projection_x_coordinate",
"units": "metre",
},
{
"axis": "Y",
"long_name": "Northing",
"standard_name": "projection_y_coordinate",
"units": "metre",
},
]
def test_cf_from_utm__nad83():
crs = CRS("epsg:26917")
expected_cf = {
"semi_major_axis": 6378137.0,
"semi_minor_axis": crs.ellipsoid.semi_minor_metre,
"inverse_flattening": crs.ellipsoid.inverse_flattening,
"reference_ellipsoid_name": "GRS 1980",
"longitude_of_prime_meridian": 0.0,
"prime_meridian_name": "Greenwich",
"geographic_crs_name": "NAD83",
"horizontal_datum_name": "North American Datum 1983",
"projected_crs_name": "NAD83 / UTM zone 17N",
"grid_mapping_name": "transverse_mercator",
"latitude_of_projection_origin": 0.0,
"longitude_of_central_meridian": -81.0,
"false_easting": 500000.0,
"false_northing": 0.0,
"scale_factor_at_central_meridian": 0.9996,
}
cf_dict = crs.to_cf()
assert cf_dict.pop("crs_wkt").startswith("PROJCRS[")
assert cf_dict == expected_cf
# test roundtrip
_test_roundtrip(expected_cf, "PROJCRS[")
# test coordinate system
assert crs.cs_to_cf() == [
{
"axis": "X",
"long_name": "Easting",
"standard_name": "projection_x_coordinate",
"units": "metre",
},
{
"axis": "Y",
"long_name": "Northing",
"standard_name": "projection_y_coordinate",
"units": "metre",
},
]
def test_cf_rotated_latlon():
crs = CRS.from_cf(
dict(
grid_mapping_name="rotated_latitude_longitude",
grid_north_pole_latitude=32.5,
grid_north_pole_longitude=170.0,
)
)
expected_cf = {
"semi_major_axis": 6378137.0,
"semi_minor_axis": crs.ellipsoid.semi_minor_metre,
"inverse_flattening": crs.ellipsoid.inverse_flattening,
"reference_ellipsoid_name": "WGS 84",
"longitude_of_prime_meridian": 0.0,
"prime_meridian_name": "Greenwich",
"horizontal_datum_name": "World Geodetic System 1984",
"grid_mapping_name": "rotated_latitude_longitude",
"grid_north_pole_latitude": 32.5,
"grid_north_pole_longitude": 170.0,
"north_pole_grid_longitude": 0.0,
"geographic_crs_name": "undefined",
}
cf_dict = crs.to_cf()
assert cf_dict.pop("crs_wkt").startswith("GEOGCRS[")
assert cf_dict == expected_cf
# test roundtrip
_test_roundtrip(expected_cf, "GEOGCRS[")
# test coordinate system
assert crs.cs_to_cf() == [
{
"standard_name": "grid_longitude",
"long_name": "longitude in rotated pole grid",
"units": "degrees",
"axis": "X",
},
{
"standard_name": "grid_latitude",
"long_name": "latitude in rotated pole grid",
"units": "degrees",
"axis": "Y",
},
]
with pytest.warns(UserWarning):
proj_dict = crs.to_dict()
assert proj_dict == {
"proj": "ob_tran",
"o_proj": "longlat",
"o_lat_p": 32.5,
"o_lon_p": 0,
"lon_0": 350,
"datum": "WGS84",
"no_defs": None,
"type": "crs",
}
def test_cf_rotated_latlon__grid():
crs = CRS.from_cf(
dict(
grid_mapping_name="rotated_latitude_longitude",
grid_north_pole_latitude=32.5,
grid_north_pole_longitude=1.0,
north_pole_grid_longitude=170.0,
)
)
with pytest.warns(UserWarning):
proj_dict = crs.to_dict()
assert proj_dict == {
"proj": "ob_tran",
"o_proj": "longlat",
"o_lat_p": 32.5,
"o_lon_p": 170.0,
"lon_0": 181.0,
"datum": "WGS84",
"no_defs": None,
"type": "crs",
}
def test_rotated_pole_to_cf():
rotated_pole_wkt = (
'GEOGCRS["undefined",\n'
' BASEGEOGCRS["Unknown datum based upon the GRS 1980 ellipsoid",\n'
' DATUM["Not specified (based on GRS 1980 ellipsoid)",\n'
' ELLIPSOID["GRS 1980",6378137,298.257222101,\n'
' LENGTHUNIT["metre",1]]],\n'
' PRIMEM["Greenwich",0,\n'
' ANGLEUNIT["degree",0.0174532925199433]]],\n'
' DERIVINGCONVERSION["Pole rotation (netCDF CF convention)",\n'
' METHOD["Pole rotation (netCDF CF convention)"],\n'
' PARAMETER["Grid north pole latitude (netCDF CF '
'convention)",2,\n'
' ANGLEUNIT["degree",0.0174532925199433,\n'
' ID["EPSG",9122]]],\n'
' PARAMETER["Grid north pole longitude (netCDF CF '
'convention)",3,\n'
' ANGLEUNIT["degree",0.0174532925199433,\n'
' ID["EPSG",9122]]],\n'
' PARAMETER["North pole grid longitude (netCDF CF '
'convention)",4,\n'
' ANGLEUNIT["degree",0.0174532925199433,\n'
' ID["EPSG",9122]]]],\n'
" CS[ellipsoidal,2],\n"
' AXIS["geodetic latitude (Lat)",north,\n'
" ORDER[1],\n"
' ANGLEUNIT["degree",0.0174532925199433,\n'
' ID["EPSG",9122]]],\n'
' AXIS["geodetic longitude (Lon)",east,\n'
" ORDER[2],\n"
' ANGLEUNIT["degree",0.0174532925199433,\n'
' ID["EPSG",9122]]]]'
)
crs = CRS(rotated_pole_wkt)
expected_cf = {
"semi_major_axis": 6378137.0,
"semi_minor_axis": 6356752.314140356,
"inverse_flattening": 298.257222101,
"reference_ellipsoid_name": "GRS 1980",
"longitude_of_prime_meridian": 0.0,
"prime_meridian_name": "Greenwich",
"geographic_crs_name": "undefined",
"grid_mapping_name": "rotated_latitude_longitude",
"grid_north_pole_latitude": 2.0,
"grid_north_pole_longitude": 3.0,
"north_pole_grid_longitude": 4.0,
"horizontal_datum_name": "Not specified (based on GRS 1980 ellipsoid)",
}
cf_dict = crs.to_cf()
assert cf_dict.pop("crs_wkt").startswith("GEOGCRS[")
assert cf_dict == expected_cf
# test roundtrip
_test_roundtrip(expected_cf, "GEOGCRS[")
def test_grib_rotated_pole_to_cf():
rotated_pole_wkt = """GEOGCRS["Coordinate System imported from GRIB file",
BASEGEOGCRS["Coordinate System imported from GRIB file",
DATUM["unnamed",
ELLIPSOID["Sphere",6371229,0,
LENGTHUNIT["metre",1,
ID["EPSG",9001]]]],
PRIMEM["Greenwich",0,
ANGLEUNIT["degree",0.0174532925199433,
ID["EPSG",9122]]]],
DERIVINGCONVERSION["Pole rotation (GRIB convention)",
METHOD["Pole rotation (GRIB convention)"],
PARAMETER["Latitude of the southern pole (GRIB convention)",-33.443381,
ANGLEUNIT["degree",0.0174532925199433,
ID["EPSG",9122]]],
PARAMETER["Longitude of the southern pole (GRIB convention)",-93.536426,
ANGLEUNIT["degree",0.0174532925199433,
ID["EPSG",9122]]],
PARAMETER["Axis rotation (GRIB convention)",0,
ANGLEUNIT["degree",0.0174532925199433,
ID["EPSG",9122]]]],
CS[ellipsoidal,2],
AXIS["latitude",north,
ORDER[1],
ANGLEUNIT["degree",0.0174532925199433,
ID["EPSG",9122]]],
AXIS["longitude",east,
ORDER[2],
ANGLEUNIT["degree",0.0174532925199433,
ID["EPSG",9122]]]]"""
crs = CRS(rotated_pole_wkt)
with pytest.warns(UserWarning):
cf_dict = crs.to_cf(errcheck=True)
assert cf_dict.pop("crs_wkt").startswith("GEOGCRS[")
assert not cf_dict
def test_cf_lambert_conformal_conic_1sp():
crs = CRS.from_cf(
dict(
grid_mapping_name="lambert_conformal_conic",
standard_parallel=25.0,
longitude_of_central_meridian=265.0,
latitude_of_projection_origin=25.0,
)
)
expected_cf = {
"semi_major_axis": 6378137.0,
"semi_minor_axis": crs.ellipsoid.semi_minor_metre,
"inverse_flattening": crs.ellipsoid.inverse_flattening,
"reference_ellipsoid_name": "WGS 84",
"longitude_of_prime_meridian": 0.0,
"prime_meridian_name": "Greenwich",
"horizontal_datum_name": "World Geodetic System 1984",
"grid_mapping_name": "lambert_conformal_conic",
"longitude_of_central_meridian": 265.0,
"false_easting": 0.0,
"false_northing": 0.0,
"standard_parallel": 25.0,
"geographic_crs_name": "undefined",
"projected_crs_name": "undefined",
}
cf_dict = crs.to_cf()
assert cf_dict.pop("crs_wkt").startswith("PROJCRS[")
assert cf_dict == expected_cf
# test roundtrip
_test_roundtrip(expected_cf, "PROJCRS[")
# test coordinate system
assert crs.cs_to_cf() == [
{
"axis": "X",
"long_name": "Easting",
"standard_name": "projection_x_coordinate",
"units": "metre",
},
{
"axis": "Y",
"long_name": "Northing",
"standard_name": "projection_y_coordinate",
"units": "metre",
},
]
with pytest.warns(UserWarning):
proj_dict = crs.to_dict()
assert proj_dict == {
"proj": "lcc",
"lat_1": 25,
"lat_0": 25,
"lon_0": 265,
"k_0": 1,
"x_0": 0,
"y_0": 0,
"datum": "WGS84",
"units": "m",
"no_defs": None,
"type": "crs",
}
@pytest.mark.parametrize("standard_parallel", [[25.0, 30.0], "25., 30."])
def test_cf_lambert_conformal_conic_2sp(standard_parallel):
crs = CRS.from_cf(
dict(
grid_mapping_name="lambert_conformal_conic",
standard_parallel=standard_parallel,
longitude_of_central_meridian=265.0,
latitude_of_projection_origin=25.0,
)
)
expected_cf = {
"semi_major_axis": 6378137.0,
"semi_minor_axis": crs.ellipsoid.semi_minor_metre,
"inverse_flattening": crs.ellipsoid.inverse_flattening,
"reference_ellipsoid_name": "WGS 84",
"longitude_of_prime_meridian": 0.0,
"prime_meridian_name": "Greenwich",
"horizontal_datum_name": "World Geodetic System 1984",
"grid_mapping_name": "lambert_conformal_conic",
"standard_parallel": (25.0, 30.0),
"latitude_of_projection_origin": 25.0,
"longitude_of_central_meridian": 265.0,
"false_easting": 0.0,
"false_northing": 0.0,
"geographic_crs_name": "undefined",
"projected_crs_name": "undefined",
}
cf_dict = crs.to_cf()
assert cf_dict.pop("crs_wkt").startswith("PROJCRS[")
assert cf_dict == expected_cf
# test roundtrip
_test_roundtrip(expected_cf, "PROJCRS[")
# test coordinate system
assert crs.cs_to_cf() == [
{
"axis": "X",
"long_name": "Easting",
"standard_name": "projection_x_coordinate",
"units": "metre",
},
{
"axis": "Y",
"long_name": "Northing",
"standard_name": "projection_y_coordinate",
"units": "metre",
},
]
with pytest.warns(UserWarning):
proj_dict = crs.to_dict()
assert proj_dict == {
"proj": "lcc",
"lat_1": 25,
"lat_2": 30,
"lat_0": 25,
"lon_0": 265,
"x_0": 0,
"y_0": 0,
"datum": "WGS84",
"units": "m",
"no_defs": None,
"type": "crs",
}
def test_oblique_mercator():
crs = CRS.from_cf(
dict(
grid_mapping_name="oblique_mercator",
azimuth_of_central_line=0.35,
latitude_of_projection_origin=10,
longitude_of_projection_origin=15,
reference_ellipsoid_name="WGS84",
false_easting=0.0,
false_northing=0.0,
)
)
expected_cf = {
"semi_major_axis": 6378137.0,
"semi_minor_axis": crs.ellipsoid.semi_minor_metre,
"inverse_flattening": crs.ellipsoid.inverse_flattening,
"reference_ellipsoid_name": "WGS 84",
"longitude_of_prime_meridian": 0.0,
"prime_meridian_name": "Greenwich",
"grid_mapping_name": "oblique_mercator",
"latitude_of_projection_origin": 10.0,
"longitude_of_projection_origin": 15.0,
"azimuth_of_central_line": 0.35,
"scale_factor_at_projection_origin": 1.0,
"false_easting": 0.0,
"false_northing": 0.0,
"geographic_crs_name": "undefined",
"projected_crs_name": "undefined",
"horizontal_datum_name": "undefined",
}
cf_dict = crs.to_cf()
assert cf_dict.pop("crs_wkt").startswith("PROJCRS[")
assert cf_dict == expected_cf
# test roundtrip
_test_roundtrip(expected_cf, "PROJCRS[")
# test coordinate system
assert crs.cs_to_cf() == [
{
"axis": "X",
"long_name": "Easting",
"standard_name": "projection_x_coordinate",
"units": "metre",
},
{
"axis": "Y",
"long_name": "Northing",
"standard_name": "projection_y_coordinate",
"units": "metre",
},
]
with pytest.warns(UserWarning):
assert crs.to_dict() == {
"proj": "omerc",
"lat_0": 10,
"lonc": 15,
"alpha": 0.35,
"gamma": 0,
"k": 1,
"x_0": 0,
"y_0": 0,
"ellps": "WGS84",
"units": "m",
"no_defs": None,
"type": "crs",
}
def test_oblique_mercator_losing_gamma():
crs = CRS(
"+proj=omerc +lat_0=-36.10360962430914 +lonc=147.0632291727015 "
"+alpha=-54.78622979612904 +k=1 +x_0=0 +y_0=0 +gamma=-54.78622979612904"
)
with pytest.warns(
UserWarning,
match="angle from rectified to skew grid parameter lost in conversion to CF",
):
crs.to_cf()
def test_cf_from_invalid():
with pytest.raises(CRSError):
CRS.from_cf(
dict(
longitude_of_central_meridian=265.0, latitude_of_projection_origin=25.0
)
)
with pytest.raises(CRSError):
CRS.from_cf(
dict(grid_mapping_name="invalid", latitude_of_projection_origin=25.0)
)
def test_geos_crs_sweep():
crs = CRS.from_cf(
dict(
grid_mapping_name="geostationary",
perspective_point_height=1,
sweep_angle_axis="x",
)
)
expected_cf = {
"semi_major_axis": 6378137.0,
"semi_minor_axis": crs.ellipsoid.semi_minor_metre,
"inverse_flattening": crs.ellipsoid.inverse_flattening,
"reference_ellipsoid_name": "WGS 84",
"longitude_of_prime_meridian": 0.0,
"prime_meridian_name": "Greenwich",
"horizontal_datum_name": "World Geodetic System 1984",
"grid_mapping_name": "geostationary",
"sweep_angle_axis": "x",
"perspective_point_height": 1.0,
"latitude_of_projection_origin": 0.0,
"longitude_of_projection_origin": 0.0,
"false_easting": 0.0,
"false_northing": 0.0,
"geographic_crs_name": "undefined",
"projected_crs_name": "undefined",
}
cf_dict = crs.to_cf()
assert cf_dict.pop("crs_wkt").startswith("PROJCRS[")
assert cf_dict == expected_cf
# test roundtrip
_test_roundtrip(expected_cf, "PROJCRS[")
# test coordinate system
assert crs.cs_to_cf() == [
{
"axis": "X",
"long_name": "Easting",
"standard_name": "projection_x_coordinate",
"units": "metre",
},
{
"axis": "Y",
"long_name": "Northing",
"standard_name": "projection_y_coordinate",
"units": "metre",
},
]
def test_geos_crs_fixed_angle_axis():
crs = CRS.from_cf(
dict(
grid_mapping_name="geostationary",
perspective_point_height=1,
fixed_angle_axis="y",
),
)
expected_cf = {
"semi_major_axis": 6378137.0,
"semi_minor_axis": crs.ellipsoid.semi_minor_metre,
"inverse_flattening": crs.ellipsoid.inverse_flattening,
"reference_ellipsoid_name": "WGS 84",
"longitude_of_prime_meridian": 0.0,
"prime_meridian_name": "Greenwich",
"horizontal_datum_name": "World Geodetic System 1984",
"grid_mapping_name": "geostationary",
"sweep_angle_axis": "x",
"perspective_point_height": 1.0,
"latitude_of_projection_origin": 0.0,
"longitude_of_projection_origin": 0.0,
"false_easting": 0.0,
"false_northing": 0.0,
"geographic_crs_name": "undefined",
"projected_crs_name": "undefined",
}
cf_dict = crs.to_cf()
assert cf_dict.pop("crs_wkt").startswith("PROJCRS[")
assert cf_dict == expected_cf
# test roundtrip
_test_roundtrip(expected_cf, "PROJCRS[")
# test coordinate system
assert crs.cs_to_cf() == [
{
"axis": "X",
"long_name": "Easting",
"standard_name": "projection_x_coordinate",
"units": "metre",
},
{
"axis": "Y",
"long_name": "Northing",
"standard_name": "projection_y_coordinate",
"units": "metre",
},
]
def test_geos_proj_string():
crs = CRS({"proj": "geos", "h": 35785831.0, "a": 6378169.0, "b": 6356583.8})
expected_cf = {
"semi_major_axis": 6378169.0,
"semi_minor_axis": 6356583.8,
"inverse_flattening": crs.ellipsoid.inverse_flattening,
"longitude_of_prime_meridian": 0.0,
"prime_meridian_name": "Greenwich",
"grid_mapping_name": "geostationary",
"sweep_angle_axis": "y",
"perspective_point_height": 35785831.0,
"latitude_of_projection_origin": 0.0,
"longitude_of_projection_origin": 0.0,
"false_easting": 0.0,
"false_northing": 0.0,
"geographic_crs_name": "unknown",
"horizontal_datum_name": "unknown",
"projected_crs_name": "unknown",
"reference_ellipsoid_name": "unknown",
}
cf_dict = crs.to_cf()
assert cf_dict.pop("crs_wkt").startswith("PROJCRS[")
assert cf_dict == expected_cf
# test roundtrip
_test_roundtrip(expected_cf, "PROJCRS[")
# test coordinate system
assert crs.cs_to_cf() == [
{
"axis": "X",
"long_name": "Easting",
"standard_name": "projection_x_coordinate",
"units": "metre",
},
{
"axis": "Y",
"long_name": "Northing",
"standard_name": "projection_y_coordinate",
"units": "metre",
},
]
def test_ob_tran_not_rotated_latlon():
crs = CRS("+proj=ob_tran +o_proj=moll +o_lat_p=45 +o_lon_p=-90 +lon_0=-90")
with pytest.warns(UserWarning):
cf_dict = crs.to_cf(errcheck=True)
assert cf_dict.pop("crs_wkt").startswith("PROJCRS[")
assert cf_dict == {}
def test_mercator_b():
crs = CRS.from_cf(
{
"grid_mapping_name": "mercator",
"longitude_of_projection_origin": 10,
"standard_parallel": 21.354,
"false_easting": 0,
"false_northing": 0,
}
)
expected_cf = {
"semi_major_axis": 6378137.0,
"semi_minor_axis": crs.ellipsoid.semi_minor_metre,
"inverse_flattening": crs.ellipsoid.inverse_flattening,
"reference_ellipsoid_name": "WGS 84",
"longitude_of_prime_meridian": 0.0,
"prime_meridian_name": "Greenwich",
"horizontal_datum_name": "World Geodetic System 1984",
"grid_mapping_name": "mercator",
"standard_parallel": 21.354,
"longitude_of_projection_origin": 10.0,
"false_easting": 0.0,
"false_northing": 0.0,
"geographic_crs_name": "undefined",
"projected_crs_name": "undefined",
}
with pytest.warns(UserWarning):
assert crs.to_dict() == {
"datum": "WGS84",
"lat_ts": 21.354,
"lon_0": 10,
"no_defs": None,
"proj": "merc",
"type": "crs",
"units": "m",
"x_0": 0,
"y_0": 0,
}
cf_dict = crs.to_cf()
assert cf_dict.pop("crs_wkt").startswith("PROJCRS[")
assert cf_dict == expected_cf
# test roundtrip
_test_roundtrip(expected_cf, "PROJCRS[")
# test coordinate system
assert crs.cs_to_cf() == [
{
"axis": "X",
"long_name": "Easting",
"standard_name": "projection_x_coordinate",
"units": "metre",
},
{
"axis": "Y",
"long_name": "Northing",
"standard_name": "projection_y_coordinate",
"units": "metre",
},
]
def test_osgb_1936():
crs = CRS("OSGB 1936 / British National Grid")
param_dict = _to_dict(crs.coordinate_operation)
expected_cf = {
"semi_major_axis": crs.ellipsoid.semi_major_metre,
"semi_minor_axis": crs.ellipsoid.semi_minor_metre,
"inverse_flattening": crs.ellipsoid.inverse_flattening,
"reference_ellipsoid_name": "Airy 1830",
"longitude_of_prime_meridian": 0.0,
"prime_meridian_name": "Greenwich",
"geographic_crs_name": "OSGB 1936",
"horizontal_datum_name": "OSGB 1936",
"projected_crs_name": "OSGB 1936 / British National Grid",
"grid_mapping_name": "transverse_mercator",
"latitude_of_projection_origin": 49.0,
"longitude_of_central_meridian": -2.0,
"false_easting": 400000.0,
"false_northing": -100000.0,
"scale_factor_at_central_meridian": param_dict[
"Scale factor at natural origin"
],
}
if PROJ_LOOSE_VERSION >= version.parse("8.0.1"):
expected_cf.update(
geographic_crs_name="OSGB36",
horizontal_datum_name="Ordnance Survey of Great Britain 1936",
projected_crs_name="OSGB36 / British National Grid",
)
cf_dict = crs.to_cf()
assert cf_dict.pop("crs_wkt").startswith("PROJCRS[")
assert cf_dict == expected_cf
# test roundtrip
_test_roundtrip(expected_cf, "PROJCRS[")
# test coordinate system
assert crs.cs_to_cf() == [
{
"axis": "X",
"long_name": "Easting",
"standard_name": "projection_x_coordinate",
"units": "metre",
},
{
"axis": "Y",
"long_name": "Northing",
"standard_name": "projection_y_coordinate",
"units": "metre",
},
]
def test_export_compound_crs():
crs = CRS("urn:ogc:def:crs,crs:EPSG::2393,crs:EPSG::5717")
expected_cf = {
"semi_major_axis": 6378388.0,
"semi_minor_axis": crs.ellipsoid.semi_minor_metre,
"inverse_flattening": 297.0,