def test_bound_crs__example():
proj_crs = ProjectedCRS(
conversion=TransverseMercatorConversion(
latitude_natural_origin=0,
longitude_natural_origin=15,
false_easting=2520000,
false_northing=0,
scale_factor_natural_origin=0.9996,
),
geodetic_crs=GeographicCRS(
datum=CustomDatum(ellipsoid="International 1909 (Hayford)")
),
)
bound_crs = BoundCRS(
source_crs=proj_crs,
target_crs="WGS 84",
transformation=ToWGS84Transformation(
proj_crs.geodetic_crs, -122.74, -34.27, -22.83, -1.884, -3.4, -3.03, -15.62
),
)
with pytest.warns(UserWarning):
assert bound_crs.to_dict() == {
"ellps": "intl",
"k": 0.9996,
"lat_0": 0,
"lon_0": 15,
"no_defs": None,
"proj": "tmerc",
"towgs84": [-122.74, -34.27, -22.83, -1.884, -3.4, -3.03, -15.62],
"type": "crs",
"units": "m",
"x_0": 2520000,
"y_0": 0,
}
def test_transverse_mercator_operation__defaults():
aeaop = TransverseMercatorConversion()
assert aeaop.name == "unknown"
assert aeaop.method_name == "Transverse Mercator"
assert _to_dict(aeaop) == {
"Latitude of natural origin": 0.0,
"Longitude of natural origin": 0.0,
"False easting": 0.0,
"False northing": 0.0,
"Scale factor at natural origin": 1.0,
}
def _transverse_mercator(cf_params):
"""
http://cfconventions.org/cf-conventions/cf-conventions.html#_transverse_mercator
"""
return TransverseMercatorConversion(
latitude_natural_origin=cf_params.get("latitude_of_projection_origin", 0.0),
longitude_natural_origin=cf_params.get("longitude_of_central_meridian", 0.0),
false_easting=cf_params.get("false_easting", 0.0),
false_northing=cf_params.get("false_northing", 0.0),
scale_factor_natural_origin=cf_params.get(
"scale_factor_at_central_meridian", 1.0
),
)
def test_transverse_mercator_operation():
aeaop = TransverseMercatorConversion(
latitude_natural_origin=1,
longitude_natural_origin=2,
false_easting=3,
false_northing=4,
scale_factor_natural_origin=0.5,
)
assert aeaop.name == "unknown"
assert aeaop.method_name == "Transverse Mercator"
assert _to_dict(aeaop) == {
"Latitude of natural origin": 1.0,
"Longitude of natural origin": 2.0,
"False easting": 3.0,
"False northing": 4.0,
"Scale factor at natural origin": 0.5,
}