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# (C) British Crown Copyright 2011 - 2018, Met Office
#
# This file is part of cartopy.
#
# cartopy is free software: you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License as published by the
# Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# cartopy is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with cartopy. If not, see <https://www.gnu.org/licenses/>.
from __future__ import (absolute_import, division, print_function)
from numpy.testing import assert_array_almost_equal
import pytest
import cartopy.crs as ccrs
def check_proj4_params(crs, other_args):
expected = other_args | {'proj=lcc', 'no_defs'}
pro4_params = set(crs.proj4_init.lstrip('+').split(' +'))
assert expected == pro4_params
def test_defaults():
crs = ccrs.LambertConformal()
other_args = {'ellps=WGS84', 'lon_0=-96.0', 'lat_0=39.0', 'x_0=0.0',
'y_0=0.0', 'lat_1=33', 'lat_2=45'}
check_proj4_params(crs, other_args)
def test_default_with_cutoff():
crs = ccrs.LambertConformal(cutoff=-80)
crs2 = ccrs.LambertConformal(cutoff=-80)
default = ccrs.LambertConformal()
other_args = {'ellps=WGS84', 'lon_0=-96.0', 'lat_0=39.0', 'x_0=0.0',
'y_0=0.0', 'lat_1=33', 'lat_2=45'}
check_proj4_params(crs, other_args)
# Check the behaviour of !=, == and (not ==) for the different cutoffs.
assert crs == crs2
assert crs != default
assert hash(crs) != hash(default)
assert hash(crs) == hash(crs2)
assert_array_almost_equal(crs.y_limits,
(-49788019.81831982, 30793476.08487709))
def test_specific_lambert():
# This projection comes from EPSG Projection 3034 - ETRS89 / ETRS-LCC.
crs = ccrs.LambertConformal(central_longitude=10,
standard_parallels=(35, 65),
central_latitude=52,
false_easting=4000000,
false_northing=2800000,
globe=ccrs.Globe(ellipse='GRS80'))
other_args = {'ellps=GRS80', 'lon_0=10', 'lat_0=52',
'x_0=4000000', 'y_0=2800000', 'lat_1=35', 'lat_2=65'}
check_proj4_params(crs, other_args)
class Test_LambertConformal_standard_parallels(object):
def test_single_value(self):
crs = ccrs.LambertConformal(standard_parallels=[1.])
other_args = {'ellps=WGS84', 'lon_0=-96.0', 'lat_0=39.0',
'x_0=0.0', 'y_0=0.0', 'lat_1=1.0'}
check_proj4_params(crs, other_args)
def test_no_parallel(self):
with pytest.raises(ValueError, message='1 or 2 standard parallels'):
ccrs.LambertConformal(standard_parallels=[])
def test_too_many_parallel(self):
with pytest.raises(ValueError, message='1 or 2 standard parallels'):
ccrs.LambertConformal(standard_parallels=[1, 2, 3])
def test_single_spole(self):
s_pole_crs = ccrs.LambertConformal(standard_parallels=[-1.])
assert_array_almost_equal(s_pole_crs.x_limits,
(-19840440, 19840440.),
decimal=0)
assert_array_almost_equal(s_pole_crs.y_limits,
(-370239953, -8191953),
decimal=0)
def test_single_npole(self):
n_pole_crs = ccrs.LambertConformal(standard_parallels=[1.])
assert_array_almost_equal(n_pole_crs.x_limits,
(-20222156, 20222156),
decimal=0)
assert_array_almost_equal(n_pole_crs.y_limits,
(-8164817, 360848720),
decimal=0)
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