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# Copyright Crown and Cartopy Contributors
#
# This file is part of Cartopy and is released under the BSD 3-clause license.
# See LICENSE in the root of the repository for full licensing details.
"""
Tests for the Oblique Mercator projection.
"""
from copy import deepcopy
from typing import Dict, List, NamedTuple, Tuple
import numpy as np
import pytest
import cartopy.crs as ccrs
from .helpers import check_proj_params
@pytest.fixture
def oblique_mercator() -> ccrs.ObliqueMercator:
return ccrs.ObliqueMercator()
@pytest.fixture
def rotated_mercator() -> ccrs.ObliqueMercator:
return ccrs.ObliqueMercator(azimuth=90.0)
@pytest.fixture
def plate_carree() -> ccrs.PlateCarree:
return ccrs.PlateCarree()
class TestCrsArgs:
point_a_plate_carree = (-3.474083, 50.727301)
point_b_plate_carree = (0.5, 50.5)
proj_kwargs_default = dict(
ellps="WGS84",
lonc="0.0",
lat_0="0.0",
k="1.0",
x_0="0.0",
y_0="0.0",
alpha="0.0",
units="m",
)
class ParamTuple(NamedTuple):
id: str
crs_kwargs: dict
proj_kwargs: Dict[str, str]
expected_a: Tuple[float, float]
expected_b: Tuple[float, float]
param_list: List[ParamTuple] = [
ParamTuple(
"default",
dict(),
dict(),
(-245106.75804, 5626768.52447),
(35451.51708, 5595849.69689),
),
ParamTuple(
"azimuth",
dict(azimuth=90.0),
dict(alpha="89.999"),
(-386712.17018, 6540102.97351),
(55680.57266, 6500330.56121),
),
ParamTuple(
"central_longitude",
dict(central_longitude=90.0),
dict(lonc="90.0"),
(-4739202.85619, 10329047.01897),
(-4786583.034, 9966930.01085),
),
ParamTuple(
"central_latitude",
dict(central_latitude=45.0),
dict(lat_0="45.0"),
(-245269.04118, 642564.31415),
(35474.56405, 611638.73957),
),
ParamTuple(
"false_easting_northing",
dict(false_easting=1000000, false_northing=-2000000),
dict(x_0="1000000", y_0="-2000000"),
(754893.24196, 3626768.52447),
(1035451.51708, 3595849.69689),
),
ParamTuple(
"scale_factor",
# Number inherited from test_mercator.py .
dict(scale_factor=0.939692620786),
dict(k="0.939692620786"),
(-230325.01183, 5287432.86131),
(33313.52899, 5258378.6672),
),
ParamTuple(
"globe",
dict(globe=ccrs.Globe(ellipse="sphere")),
dict(ellps="sphere"),
(-244502.86059, 5646357.44304),
(35364.23322, 5615460.21872),
),
ParamTuple(
"combo",
dict(
azimuth=90.0,
central_longitude=90.0,
central_latitude=45.0,
false_easting=1000000,
false_northing=-2000000,
scale_factor=0.939692620786,
globe=ccrs.Globe(ellipse="sphere"),
),
dict(
alpha="89.999",
lonc="90.0",
lat_0="45.0",
x_0="1000000",
y_0="-2000000",
k="0.939692620786",
ellps="sphere",
),
(-4279982.08123, 1916861.68937),
(-4138080.80706, 1631302.04295),
),
]
param_ids: List[str] = [p.id for p in param_list]
@pytest.fixture(autouse=True, params=param_list, ids=param_ids)
def make_variant_inputs(self, request) -> None:
inputs: TestCrsArgs.ParamTuple = request.param
self.oblique_mercator = ccrs.ObliqueMercator(**inputs.crs_kwargs)
proj_kwargs_expected = dict(
self.proj_kwargs_default, **inputs.proj_kwargs
)
self.proj_params = {
f"{k}={v}" for k, v in proj_kwargs_expected.items()
}
self.expected_a = inputs.expected_a
self.expected_b = inputs.expected_b
def test_proj_params(self):
check_proj_params("omerc", self.oblique_mercator, self.proj_params)
def test_transform_point(self, plate_carree):
# (Point equivalence has been confirmed via plotting).
src_expected = (
(self.point_a_plate_carree, self.expected_a),
(self.point_b_plate_carree, self.expected_b),
)
for src, expected in src_expected:
res = self.oblique_mercator.transform_point(
*src,
src_crs=plate_carree,
)
np.testing.assert_array_almost_equal(res, expected, decimal=4)
@pytest.fixture
def oblique_variants(
oblique_mercator,
rotated_mercator,
) -> Tuple[ccrs.ObliqueMercator, ccrs.ObliqueMercator, ccrs.ObliqueMercator]:
"""Setup three ObliqueMercator objects, two identical, for eq testing."""
default = oblique_mercator
alt_1 = rotated_mercator
alt_2 = deepcopy(rotated_mercator)
return default, alt_1, alt_2
def test_equality(oblique_variants):
"""Check == and != operators of ccrs.ObliqueMercator."""
default, alt_1, alt_2 = oblique_variants
assert alt_1 == alt_2
assert alt_1 != default
assert hash(alt_1) != hash(default)
assert hash(alt_1) == hash(alt_2)
@pytest.mark.parametrize(
"reverse_coord", [False, True], ids=["xy_order", "yx_order"]
)
def test_nan(oblique_mercator, plate_carree, reverse_coord):
coord = (0.0, np.nan)
if reverse_coord:
coord = tuple(reversed(coord))
res = oblique_mercator.transform_point(*coord, src_crs=plate_carree)
assert np.all(np.isnan(res))
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