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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 Equidistant Conic coordinate system.
"""
import numpy as np
from numpy.testing import assert_almost_equal, assert_array_almost_equal
import pyproj
import pytest
import cartopy.crs as ccrs
from .helpers import check_proj_params
class TestEquidistantConic:
def test_default(self):
eqdc = ccrs.EquidistantConic()
other_args = {'ellps=WGS84', 'lon_0=0.0', 'lat_0=0.0', 'x_0=0.0',
'y_0=0.0', 'lat_1=20.0', 'lat_2=50.0'}
check_proj_params('eqdc', eqdc, other_args)
expected_x = (-22784919.35600352, 22784919.35600352)
expected_y = (-10001965.729313632, 17558791.85156368)
if pyproj.__proj_version__ >= '9.2.0':
expected_x = (-22784919.3559981, 22784919.3559981)
expected_y = (-10001965.72931272, 17558791.85157471)
assert_almost_equal(np.array(eqdc.x_limits),
expected_x,
decimal=7)
assert_almost_equal(np.array(eqdc.y_limits),
expected_y,
decimal=7)
def test_eccentric_globe(self):
globe = ccrs.Globe(semimajor_axis=1000, semiminor_axis=500,
ellipse=None)
eqdc = ccrs.EquidistantConic(globe=globe)
other_args = {'a=1000', 'b=500', 'lon_0=0.0', 'lat_0=0.0', 'x_0=0.0',
'y_0=0.0', 'lat_1=20.0', 'lat_2=50.0'}
check_proj_params('eqdc', eqdc, other_args)
expected_x = (-3016.869847713461, 3016.869847713461)
expected_y = (-1216.6029342241113, 2511.0574375797723)
if pyproj.__proj_version__ >= '9.2.0':
expected_x = (-2960.1009481, 2960.1009481)
expected_y = (-1211.05573766, 2606.04249537)
assert_almost_equal(np.array(eqdc.x_limits),
expected_x,
decimal=7)
assert_almost_equal(np.array(eqdc.y_limits),
expected_y,
decimal=7)
def test_eastings(self):
eqdc_offset = ccrs.EquidistantConic(false_easting=1234,
false_northing=-4321)
other_args = {'ellps=WGS84', 'lon_0=0.0', 'lat_0=0.0', 'x_0=1234',
'y_0=-4321', 'lat_1=20.0', 'lat_2=50.0'}
check_proj_params('eqdc', eqdc_offset, other_args)
@pytest.mark.parametrize('lon', [-10.0, 10.0])
def test_central_longitude(self, lon):
eqdc = ccrs.EquidistantConic()
eqdc_offset = ccrs.EquidistantConic(central_longitude=lon)
other_args = {'ellps=WGS84', f'lon_0={lon}', 'lat_0=0.0',
'x_0=0.0', 'y_0=0.0', 'lat_1=20.0', 'lat_2=50.0'}
check_proj_params('eqdc', eqdc_offset, other_args)
assert_array_almost_equal(
eqdc_offset.boundary.coords,
eqdc.boundary.coords,
decimal=0,
)
def test_standard_parallels(self):
eqdc = ccrs.EquidistantConic(standard_parallels=(13, 37))
other_args = {'ellps=WGS84', 'lon_0=0.0', 'lat_0=0.0', 'x_0=0.0',
'y_0=0.0', 'lat_1=13', 'lat_2=37'}
check_proj_params('eqdc', eqdc, other_args)
eqdc = ccrs.EquidistantConic(standard_parallels=(13, ))
other_args = {'ellps=WGS84', 'lon_0=0.0', 'lat_0=0.0', 'x_0=0.0',
'y_0=0.0', 'lat_1=13'}
check_proj_params('eqdc', eqdc, other_args)
eqdc = ccrs.EquidistantConic(standard_parallels=13)
other_args = {'ellps=WGS84', 'lon_0=0.0', 'lat_0=0.0', 'x_0=0.0',
'y_0=0.0', 'lat_1=13'}
check_proj_params('eqdc', eqdc, other_args)
def test_sphere_transform(self):
# USGS Professional Paper 1395, pg 298
globe = ccrs.Globe(semimajor_axis=1.0, semiminor_axis=1.0,
ellipse=None)
lat_1 = 29.5
lat_2 = 45.5
eqdc = ccrs.EquidistantConic(central_longitude=-96.0,
central_latitude=23.0,
standard_parallels=(lat_1, lat_2),
globe=globe)
geodetic = eqdc.as_geodetic()
other_args = {'a=1.0', 'b=1.0', 'lon_0=-96.0', 'lat_0=23.0', 'x_0=0.0',
'y_0=0.0', 'lat_1=29.5', 'lat_2=45.5'}
check_proj_params('eqdc', eqdc, other_args)
assert_almost_equal(np.array(eqdc.x_limits),
(-3.520038619089038, 3.520038619089038),
decimal=7)
assert_almost_equal(np.array(eqdc.y_limits),
(-1.9722220547535922, 2.7066811021065535),
decimal=7)
result = eqdc.transform_point(-75.0, 35.0, geodetic)
assert_almost_equal(result, (0.2952057, 0.2424021), decimal=7)
def test_ellipsoid_transform(self):
# USGS Professional Paper 1395, pp 299--300
globe = ccrs.Globe(semimajor_axis=6378206.4,
flattening=1 - np.sqrt(1 - 0.00676866),
ellipse=None)
lat_1 = 29.5
lat_2 = 45.5
eqdc = ccrs.EquidistantConic(central_latitude=23.0,
central_longitude=-96.0,
standard_parallels=(lat_1, lat_2),
globe=globe)
geodetic = eqdc.as_geodetic()
other_args = {'a=6378206.4', 'f=0.003390076308689371', 'lon_0=-96.0',
'lat_0=23.0', 'x_0=0.0', 'y_0=0.0', 'lat_1=29.5',
'lat_2=45.5'}
check_proj_params('eqdc', eqdc, other_args)
expected_x = (-22421870.719894886, 22421870.719894886)
expected_y = (-12546277.778958388, 17260638.403203618)
if pyproj.__proj_version__ >= '9.2.0':
expected_x = (-22421870.71988974, 22421870.71988976)
expected_y = (-12546277.77895742, 17260638.403216)
assert_almost_equal(np.array(eqdc.x_limits),
expected_x,
decimal=7)
assert_almost_equal(np.array(eqdc.y_limits),
expected_y,
decimal=7)
result = eqdc.transform_point(-75.0, 35.0, geodetic)
assert_almost_equal(result, (1885051.9, 1540507.6), decimal=1)
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