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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 Equal Earth coordinate system.
"""
import numpy as np
from numpy.testing import assert_almost_equal
import pytest
import cartopy.crs as ccrs
from .helpers import check_proj_params
def test_default():
eqearth = ccrs.EqualEarth()
other_args = {'ellps=WGS84', 'lon_0=0'}
check_proj_params('eqearth', eqearth, other_args)
assert_almost_equal(eqearth.x_limits,
[-17243959.0622169, 17243959.0622169])
assert_almost_equal(eqearth.y_limits,
[-8392927.59846646, 8392927.59846646])
# Expected aspect ratio from the paper.
assert_almost_equal(np.diff(eqearth.x_limits) / np.diff(eqearth.y_limits),
2.05458, decimal=5)
def test_offset():
crs = ccrs.EqualEarth()
crs_offset = ccrs.EqualEarth(false_easting=1234, false_northing=-4321)
other_args = {'ellps=WGS84', 'lon_0=0', 'x_0=1234', 'y_0=-4321'}
check_proj_params('eqearth', crs_offset, other_args)
assert tuple(np.array(crs.x_limits) + 1234) == crs_offset.x_limits
assert tuple(np.array(crs.y_limits) - 4321) == crs_offset.y_limits
def test_eccentric_globe():
globe = ccrs.Globe(semimajor_axis=1000, semiminor_axis=500,
ellipse=None)
eqearth = ccrs.EqualEarth(globe=globe)
other_args = {'a=1000', 'b=500', 'lon_0=0'}
check_proj_params('eqearth', eqearth, other_args)
assert_almost_equal(eqearth.x_limits,
[-2248.43664092550, 2248.43664092550])
assert_almost_equal(eqearth.y_limits,
[-1094.35228122148, 1094.35228122148])
# Expected aspect ratio from the paper.
assert_almost_equal(np.diff(eqearth.x_limits) / np.diff(eqearth.y_limits),
2.05458, decimal=5)
@pytest.mark.parametrize('lon', [-10.0, 10.0])
def test_central_longitude(lon):
eqearth = ccrs.EqualEarth(central_longitude=lon)
other_args = {'ellps=WGS84', f'lon_0={lon}'}
check_proj_params('eqearth', eqearth, other_args)
assert_almost_equal(eqearth.x_limits,
[-17243959.0622169, 17243959.0622169], decimal=5)
assert_almost_equal(eqearth.y_limits,
[-8392927.59846646, 8392927.59846646])
# Expected aspect ratio from the paper.
assert_almost_equal(np.diff(eqearth.x_limits) / np.diff(eqearth.y_limits),
2.05458, decimal=5)
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