def setUp(self):
self.latitude_of_projection_origin = 0.0
self.longitude_of_projection_origin = 0.0
self.perspective_point_height = 38204820000.0
self.false_easting = 0.0
self.false_northing = 0.0
self.semi_major_axis = 6377563.396
self.semi_minor_axis = 6356256.909
self.ellipsoid = GeogCS(self.semi_major_axis, self.semi_minor_axis)
self.globe = ccrs.Globe(semimajor_axis=self.semi_major_axis,
semiminor_axis=self.semi_minor_axis,
ellipse=None)
# Actual and expected coord system can be re-used for
# VerticalPerspective.test_crs_creation and test_projection_creation.
self.expected = ccrs.NearsidePerspective(
central_longitude=self.longitude_of_projection_origin,
central_latitude=self.latitude_of_projection_origin,
satellite_height=self.perspective_point_height,
false_easting=self.false_easting,
false_northing=self.false_northing,
globe=self.globe)
self.vp_cs = VerticalPerspective(self.latitude_of_projection_origin,
self.longitude_of_projection_origin,
self.perspective_point_height,
self.false_easting,
self.false_northing, self.ellipsoid)
def setUp(self):
self.latitude_of_projection_origin = 0.0
self.longitude_of_projection_origin = 0.0
self.semi_major_axis = 6377563.396
self.semi_minor_axis = 6356256.909
self.perspective_point_height = 38204820000.0
self.ellipsoid = GeogCS(self.semi_major_axis, self.semi_minor_axis)
self.vp_cs = VerticalPerspective(self.latitude_of_projection_origin,
self.longitude_of_projection_origin,
self.perspective_point_height,
ellipsoid=self.ellipsoid)
def test_vp_cs(self):
latitude_of_projection_origin = 1.0
longitude_of_projection_origin = 2.0
perspective_point_height = 2000000.0
false_easting = 100.0
false_northing = 200.0
semi_major_axis = 6377563.396
semi_minor_axis = 6356256.909
ellipsoid = GeogCS(semi_major_axis, semi_minor_axis)
coord_system = VerticalPerspective(
latitude_of_projection_origin=latitude_of_projection_origin,
longitude_of_projection_origin=longitude_of_projection_origin,
perspective_point_height=perspective_point_height,
false_easting=false_easting,
false_northing=false_northing,
ellipsoid=ellipsoid)
expected = {
'grid_mapping_name': b'vertical_perspective',
'latitude_of_projection_origin': latitude_of_projection_origin,
'longitude_of_projection_origin': longitude_of_projection_origin,
'perspective_point_height': perspective_point_height,
'false_easting': false_easting,
'false_northing': false_northing,
'semi_major_axis': semi_major_axis,
'semi_minor_axis': semi_minor_axis,
'longitude_of_prime_meridian': 0,
}
self._test(coord_system, expected)
def test_set_optional_args(self):
# Check that setting the optional (non-ellipse) args works.
crs = VerticalPerspective(
0, 0, 1000, false_easting=100, false_northing=-203.7
)
self.assertEqualAndKind(crs.false_easting, 100.0)
self.assertEqualAndKind(crs.false_northing, -203.7)
def test_vp_cs(self):
latitude_of_projection_origin = 1.0
longitude_of_projection_origin = 2.0
perspective_point_height = 2000000.0
false_easting = 100.0
false_northing = 200.0
semi_major_axis = 6377563.396
semi_minor_axis = 6356256.909
ellipsoid = GeogCS(semi_major_axis, semi_minor_axis)
coord_system = VerticalPerspective(
latitude_of_projection_origin=latitude_of_projection_origin,
longitude_of_projection_origin=longitude_of_projection_origin,
perspective_point_height=perspective_point_height,
false_easting=false_easting,
false_northing=false_northing,
ellipsoid=ellipsoid,
)
expected = {
"grid_mapping_name": b"vertical_perspective",
"latitude_of_projection_origin": latitude_of_projection_origin,
"longitude_of_projection_origin": longitude_of_projection_origin,
"perspective_point_height": perspective_point_height,
"false_easting": false_easting,
"false_northing": false_northing,
"semi_major_axis": semi_major_axis,
"semi_minor_axis": semi_minor_axis,
"longitude_of_prime_meridian": 0,
}
self._test(coord_system, expected)
def test_optional_args_None(self):
# Check expected defaults with optional args=None.
crs = VerticalPerspective(0,
0,
1000,
false_easting=None,
false_northing=None)
self._check_crs_defaults(crs)
def setUp(self):
self.latitude_of_projection_origin = 0.0
self.longitude_of_projection_origin = 0.0
self.semi_major_axis = 6377563.396
self.semi_minor_axis = 6356256.909
self.perspective_point_height = 38204820000.0
self.ellipsoid = GeogCS(self.semi_major_axis, self.semi_minor_axis)
self.vp_cs = VerticalPerspective(self.latitude_of_projection_origin,
self.longitude_of_projection_origin,
self.perspective_point_height,
ellipsoid=self.ellipsoid)
def _test(self, inverse_flattening=False, no_offsets=False):
"""
Generic test that can check vertical perspective validity with or
without inverse flattening, and false_east/northing-s.
"""
test_easting = 100.0
test_northing = 200.0
cf_grid_var_kwargs = {
"spec": [],
"latitude_of_projection_origin": 1.0,
"longitude_of_projection_origin": 2.0,
"perspective_point_height": 2000000.0,
"false_easting": test_easting,
"false_northing": test_northing,
"semi_major_axis": 6377563.396,
}
ellipsoid_kwargs = {"semi_major_axis": 6377563.396}
if inverse_flattening:
ellipsoid_kwargs["inverse_flattening"] = 299.3249646
else:
ellipsoid_kwargs["semi_minor_axis"] = 6356256.909
cf_grid_var_kwargs.update(ellipsoid_kwargs)
if no_offsets:
del cf_grid_var_kwargs["false_easting"]
del cf_grid_var_kwargs["false_northing"]
test_easting = 0
test_northing = 0
cf_grid_var = mock.Mock(**cf_grid_var_kwargs)
ellipsoid = iris.coord_systems.GeogCS(**ellipsoid_kwargs)
cs = build_vertical_perspective_coordinate_system(None, cf_grid_var)
expected = VerticalPerspective(
latitude_of_projection_origin=cf_grid_var.
latitude_of_projection_origin,
longitude_of_projection_origin=cf_grid_var.
longitude_of_projection_origin,
perspective_point_height=cf_grid_var.perspective_point_height,
false_easting=test_easting,
false_northing=test_northing,
ellipsoid=ellipsoid,
)
self.assertEqual(cs, expected)
class Test_cartopy_projection(tests.IrisTest):
def setUp(self):
self.latitude_of_projection_origin = 0.0
self.longitude_of_projection_origin = 0.0
self.semi_major_axis = 6377563.396
self.semi_minor_axis = 6356256.909
self.perspective_point_height = 38204820000.0
self.ellipsoid = GeogCS(self.semi_major_axis, self.semi_minor_axis)
self.vp_cs = VerticalPerspective(
self.latitude_of_projection_origin,
self.longitude_of_projection_origin,
self.perspective_point_height,
ellipsoid=self.ellipsoid,
)
def test_projection_creation(self):
res = self.vp_cs.as_cartopy_projection()
globe = ccrs.Globe(semimajor_axis=self.semi_major_axis, semiminor_axis=self.semi_minor_axis, ellipse=None)
expected = ccrs.Geostationary(self.longitude_of_projection_origin, self.perspective_point_height, globe=globe)
self.assertEqual(res, expected)
class Test_cartopy_projection(tests.IrisTest):
def setUp(self):
self.latitude_of_projection_origin = 0.0
self.longitude_of_projection_origin = 0.0
self.semi_major_axis = 6377563.396
self.semi_minor_axis = 6356256.909
self.perspective_point_height = 38204820000.0
self.ellipsoid = GeogCS(self.semi_major_axis, self.semi_minor_axis)
self.vp_cs = VerticalPerspective(self.latitude_of_projection_origin,
self.longitude_of_projection_origin,
self.perspective_point_height,
ellipsoid=self.ellipsoid)
def test_projection_creation(self):
res = self.vp_cs.as_cartopy_projection()
globe = ccrs.Globe(semimajor_axis=self.semi_major_axis,
semiminor_axis=self.semi_minor_axis,
ellipse=None)
expected = ccrs.Geostationary(self.longitude_of_projection_origin,
self.perspective_point_height,
globe=globe)
self.assertEqual(res, expected)
def _test(self, inverse_flattening=False):
"""
Generic test that can check vertical perspective validity with or
without inverse flattening.
"""
cf_grid_var_kwargs = {
'spec': [],
'latitude_of_projection_origin': 1.0,
'longitude_of_projection_origin': 2.0,
'perspective_point_height': 2000000.0,
'false_easting': 100.0,
'false_northing': 200.0,
'semi_major_axis': 6377563.396
}
ellipsoid_kwargs = {'semi_major_axis': 6377563.396}
if inverse_flattening:
ellipsoid_kwargs['inverse_flattening'] = 299.3249646
else:
ellipsoid_kwargs['semi_minor_axis'] = 6356256.909
cf_grid_var_kwargs.update(ellipsoid_kwargs)
cf_grid_var = mock.Mock(**cf_grid_var_kwargs)
ellipsoid = iris.coord_systems.GeogCS(**ellipsoid_kwargs)
cs = build_vertical_perspective_coordinate_system(None, cf_grid_var)
expected = VerticalPerspective(
latitude_of_projection_origin=cf_grid_var.
latitude_of_projection_origin,
longitude_of_projection_origin=cf_grid_var.
longitude_of_projection_origin,
perspective_point_height=cf_grid_var.perspective_point_height,
false_easting=cf_grid_var.false_easting,
false_northing=cf_grid_var.false_northing,
ellipsoid=ellipsoid)
self.assertEqual(cs, expected)
def test_lat(self):
with self.assertRaises(ValueError):
res = VerticalPerspective(self.latitude_of_projection_origin,
self.longitude_of_projection_origin,
self.perspective_point_height,
ellipsoid=self.ellipsoid)
def test_no_optional_args(self):
# Check expected defaults with no optional args.
crs = VerticalPerspective(0, 0, 1000)
self._check_crs_defaults(crs)
class Test(tests.IrisTest):
def setUp(self):
self.latitude_of_projection_origin = 0.0
self.longitude_of_projection_origin = 0.0
self.perspective_point_height = 38204820000.0
self.false_easting = 0.0
self.false_northing = 0.0
self.semi_major_axis = 6377563.396
self.semi_minor_axis = 6356256.909
self.ellipsoid = GeogCS(self.semi_major_axis, self.semi_minor_axis)
self.globe = ccrs.Globe(
semimajor_axis=self.semi_major_axis,
semiminor_axis=self.semi_minor_axis,
ellipse=None,
)
# Actual and expected coord system can be re-used for
# VerticalPerspective.test_crs_creation and test_projection_creation.
self.expected = ccrs.NearsidePerspective(
central_longitude=self.longitude_of_projection_origin,
central_latitude=self.latitude_of_projection_origin,
satellite_height=self.perspective_point_height,
false_easting=self.false_easting,
false_northing=self.false_northing,
globe=self.globe,
)
self.vp_cs = VerticalPerspective(
self.latitude_of_projection_origin,
self.longitude_of_projection_origin,
self.perspective_point_height,
self.false_easting,
self.false_northing,
self.ellipsoid,
)
def test_crs_creation(self):
res = self.vp_cs.as_cartopy_crs()
self.assertEqual(res, self.expected)
def test_projection_creation(self):
res = self.vp_cs.as_cartopy_projection()
self.assertEqual(res, self.expected)
def test_set_optional_args(self):
# Check that setting the optional (non-ellipse) args works.
crs = VerticalPerspective(
0, 0, 1000, false_easting=100, false_northing=-203.7
)
self.assertEqualAndKind(crs.false_easting, 100.0)
self.assertEqualAndKind(crs.false_northing, -203.7)
def _check_crs_defaults(self, crs):
# Check for property defaults when no kwargs options were set.
# NOTE: except ellipsoid, which is done elsewhere.
self.assertEqualAndKind(crs.false_easting, 0.0)
self.assertEqualAndKind(crs.false_northing, 0.0)
def test_no_optional_args(self):
# Check expected defaults with no optional args.
crs = VerticalPerspective(0, 0, 1000)
self._check_crs_defaults(crs)
def test_optional_args_None(self):
# Check expected defaults with optional args=None.
crs = VerticalPerspective(
0, 0, 1000, false_easting=None, false_northing=None
)
self._check_crs_defaults(crs)
