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# (C) British Crown Copyright 2016 - 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)
import numpy as np
from numpy.testing import assert_almost_equal
import pytest
import cartopy.crs as ccrs
def check_proj4_params(crs, other_args):
expected = other_args | {'proj=sinu', 'no_defs'}
pro4_params = set(crs.proj4_init.lstrip('+').split(' +'))
assert expected == pro4_params
class TestSinusoidal(object):
def test_default(self):
crs = ccrs.Sinusoidal()
other_args = {'ellps=WGS84', 'lon_0=0.0', 'x_0=0.0', 'y_0=0.0'}
check_proj4_params(crs, other_args)
assert_almost_equal(np.array(crs.x_limits),
[-20037508.3428, 20037508.3428],
decimal=4)
assert_almost_equal(np.array(crs.y_limits),
[-10001965.7293, 10001965.7293],
decimal=4)
def test_eccentric_globe(self):
globe = ccrs.Globe(semimajor_axis=1000, semiminor_axis=500,
ellipse=None)
crs = ccrs.Sinusoidal(globe=globe)
other_args = {'a=1000', 'b=500', 'lon_0=0.0', 'x_0=0.0', 'y_0=0.0'}
check_proj4_params(crs, other_args)
assert_almost_equal(np.array(crs.x_limits),
[-3141.59, 3141.59], decimal=2)
assert_almost_equal(np.array(crs.y_limits),
[-1216.60, 1216.60], decimal=2)
def test_offset(self):
crs = ccrs.Sinusoidal()
crs_offset = ccrs.Sinusoidal(false_easting=1234,
false_northing=-4321)
other_args = {'ellps=WGS84', 'lon_0=0.0', 'x_0=1234', 'y_0=-4321'}
check_proj4_params(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
@pytest.mark.parametrize('lon', [-10.0, 10.0])
def test_central_longitude(self, lon):
crs = ccrs.Sinusoidal(central_longitude=lon)
other_args = {'ellps=WGS84', 'lon_0={}'.format(lon),
'x_0=0.0', 'y_0=0.0'}
check_proj4_params(crs, other_args)
assert_almost_equal(np.array(crs.x_limits),
[-20037508.3428, 20037508.3428],
decimal=4)
assert_almost_equal(np.array(crs.y_limits),
[-10001965.7293, 10001965.7293],
decimal=4)
def test_MODIS(self):
# Testpoints verified with MODLAND Tile Calculator
# http://landweb.nascom.nasa.gov/cgi-bin/developer/tilemap.cgi
# Settings: Sinusoidal, Global map coordinates, Forward mapping
crs = ccrs.Sinusoidal.MODIS
lons = np.array([-180, -50, 40, 180])
lats = np.array([-89.999, 30, 20, 89.999])
expected_x = np.array([-349.33, -4814886.99,
4179566.79, 349.33])
expected_y = np.array([-10007443.48, 3335851.56,
2223901.04, 10007443.48])
assert_almost_equal(crs.transform_points(crs.as_geodetic(),
lons, lats),
np.c_[expected_x, expected_y, [0, 0, 0, 0]],
decimal=2)
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