def test_invalid_slices():
with pytest.raises(IndexError):
SlicedLowLevelWCS(WCS_SPECTRAL_CUBE, [None, None, [False, False, False]])
with pytest.raises(IndexError):
SlicedLowLevelWCS(WCS_SPECTRAL_CUBE, [None, None, slice(None, None, 2)])
with pytest.raises(IndexError):
SlicedLowLevelWCS(WCS_SPECTRAL_CUBE, [None, None, 1000.100])
def test_nested_slicing():
# Make sure that if we call slicing several times, the result is the same
# as calling the slicing once with the final slice settings.
wcs = WCS_SPECTRAL_CUBE
sub1 = SlicedLowLevelWCS(
SlicedLowLevelWCS(
SlicedLowLevelWCS(wcs, [slice(None), slice(1, 10), slice(None)]),
[3, slice(2, None)]),
[slice(None), slice(2, 8)])
sub2 = wcs[3, 3:10, 2:8]
assert_allclose(sub1.pixel_to_world_values(3, 5),
sub2.pixel_to_world_values(3, 5))
assert not isinstance(sub1._wcs, SlicedLowLevelWCS)
def test_dropped_dimensions_4d(cube_4d_fitswcs):
sub = SlicedLowLevelWCS(cube_4d_fitswcs, np.s_[:, 12, 5, 5])
dwd = sub.dropped_world_dimensions
wao_classes = dwd.pop("world_axis_object_classes")
wao_components = dwd.pop("world_axis_object_components")
validate_info_dict(
dwd, {
"value": [4.e+00, -2.e+00, 1.e+10],
"world_axis_physical_types":
["pos.eq.ra", "pos.eq.dec", "em.freq"],
"world_axis_names":
['Right Ascension', 'Declination', 'Frequency'],
"world_axis_units": ["deg", "deg", "Hz"],
"serialized_classes": False,
})
assert wao_classes['celestial'][0] is SkyCoord
assert wao_classes['celestial'][1] == ()
assert isinstance(wao_classes['celestial'][2]['frame'], ICRS)
assert wao_classes['celestial'][2]['unit'] is u.deg
assert wao_classes['spectral'][0:3] == (u.Quantity, (), {})
assert wao_components[0] == ('celestial', 0, 'spherical.lon.degree')
assert wao_components[1] == ('celestial', 1, 'spherical.lat.degree')
assert wao_components[2][0:2] == ('spectral', 0)
sub = SlicedLowLevelWCS(cube_4d_fitswcs, np.s_[12, 12])
dwd = sub.dropped_world_dimensions
wao_classes = dwd.pop("world_axis_object_classes")
wao_components = dwd.pop("world_axis_object_components")
validate_info_dict(
dwd, {
"value": [1.e+10, 5.e+00],
"world_axis_physical_types": ["em.freq", "time"],
"world_axis_names": ["Frequency", "Time"],
"world_axis_units": ["Hz", "s"],
"serialized_classes": False,
})
assert wao_components[0][0:2] == ('spectral', 0)
assert wao_components[1][0] == 'time'
assert wao_components[1][1] == 0
assert wao_classes['spectral'][0:3] == (u.Quantity, (), {})
assert wao_classes['time'][0:3] == (Time, (), {})
def test_ellipsis_none_types():
wcs = SlicedLowLevelWCS(WCS_SPECTRAL_CUBE_NONE_TYPES, Ellipsis)
assert wcs.pixel_n_dim == 3
assert wcs.world_n_dim == 3
assert wcs.array_shape == (30, 20, 10)
assert wcs.pixel_shape == (10, 20, 30)
assert wcs.world_axis_physical_types == ['pos.galactic.lat', None, 'pos.galactic.lon']
assert wcs.world_axis_units == ['deg', 'Hz', 'deg']
assert_equal(wcs.axis_correlation_matrix, [[True, False, True],
[False, True, False], [True, False, True]])
assert wcs.world_axis_object_components == [('celestial', 1, 'spherical.lat.degree'),
('world', 0, 'value'),
('celestial', 0, 'spherical.lon.degree')]
assert wcs.world_axis_object_classes['celestial'][0] is SkyCoord
assert wcs.world_axis_object_classes['celestial'][1] == ()
assert isinstance(wcs.world_axis_object_classes['celestial'][2]['frame'], Galactic)
assert wcs.world_axis_object_classes['celestial'][2]['unit'] is u.deg
assert_allclose(wcs.pixel_to_world_values(29, 39, 44), (10, 20, 25))
assert_allclose(wcs.array_index_to_world_values(44, 39, 29), (10, 20, 25))
assert_allclose(wcs.world_to_pixel_values(10, 20, 25), (29., 39., 44.))
assert_equal(wcs.world_to_array_index_values(10, 20, 25), (44, 39, 29))
assert_equal(wcs.pixel_bounds, [(-1, 11), (-2, 18), (5, 15)])
assert str(wcs) == EXPECTED_ELLIPSIS_REPR_NONE_TYPES.strip()
assert EXPECTED_ELLIPSIS_REPR_NONE_TYPES.strip() in repr(wcs)
def test_no_array_shape():
wcs = SlicedLowLevelWCS(WCS_NO_SHAPE_CUBE, Ellipsis)
assert wcs.pixel_n_dim == 3
assert wcs.world_n_dim == 3
assert wcs.array_shape is None
assert wcs.pixel_shape is None
assert wcs.world_axis_physical_types == ['pos.galactic.lat', 'em.freq', 'pos.galactic.lon']
assert wcs.world_axis_units == ['deg', 'Hz', 'deg']
assert_equal(wcs.axis_correlation_matrix, [[True, False, True], [False, True, False], [True, False, True]])
assert len(wcs.world_axis_object_components) == 3
assert wcs.world_axis_object_components[0] == ('celestial', 1, 'spherical.lat.degree')
assert wcs.world_axis_object_components[1][:2] == ('spectral', 0)
assert wcs.world_axis_object_components[2] == ('celestial', 0, 'spherical.lon.degree')
assert wcs.world_axis_object_classes['celestial'][0] is SkyCoord
assert wcs.world_axis_object_classes['celestial'][1] == ()
assert isinstance(wcs.world_axis_object_classes['celestial'][2]['frame'], Galactic)
assert wcs.world_axis_object_classes['celestial'][2]['unit'] is u.deg
assert wcs.world_axis_object_classes['spectral'][0] is Quantity
assert wcs.world_axis_object_classes['spectral'][1] == ()
assert wcs.world_axis_object_classes['spectral'][2] == {}
assert_allclose(wcs.pixel_to_world_values(29, 39, 44), (10, 20, 25))
assert_allclose(wcs.array_index_to_world_values(44, 39, 29), (10, 20, 25))
assert_allclose(wcs.world_to_pixel_values(10, 20, 25), (29., 39., 44.))
assert_equal(wcs.world_to_array_index_values(10, 20, 25), (44, 39, 29))
assert str(wcs) == EXPECTED_NO_SHAPE_REPR.strip()
assert EXPECTED_NO_SHAPE_REPR.strip() in repr(wcs)
def test_spectral_slice():
wcs = SlicedLowLevelWCS(WCS_SPECTRAL_CUBE, [slice(None), 10])
assert wcs.pixel_n_dim == 2
assert wcs.world_n_dim == 2
assert wcs.array_shape == (30, 10)
assert wcs.pixel_shape == (10, 30)
assert wcs.world_axis_physical_types == ['pos.galactic.lat', 'pos.galactic.lon']
assert wcs.world_axis_units == ['deg', 'deg']
assert wcs.pixel_axis_names == ['', '']
assert wcs.world_axis_names == ['Latitude', 'Longitude']
assert_equal(wcs.axis_correlation_matrix, [[True, True], [True, True]])
assert wcs.world_axis_object_components == [('celestial', 1, 'spherical.lat.degree'),
('celestial', 0, 'spherical.lon.degree')]
assert wcs.world_axis_object_classes['celestial'][0] is SkyCoord
assert wcs.world_axis_object_classes['celestial'][1] == ()
assert isinstance(wcs.world_axis_object_classes['celestial'][2]['frame'], Galactic)
assert wcs.world_axis_object_classes['celestial'][2]['unit'] is u.deg
assert_allclose(wcs.pixel_to_world_values(29, 44), (10, 25))
assert_allclose(wcs.array_index_to_world_values(44, 29), (10, 25))
assert_allclose(wcs.world_to_pixel_values(10, 25), (29., 44.))
assert_equal(wcs.world_to_array_index_values(10, 25), (44, 29))
assert_equal(wcs.pixel_bounds, [(-1, 11), (5, 15)])
assert str(wcs) == EXPECTED_SPECTRAL_SLICE_REPR.strip()
assert EXPECTED_SPECTRAL_SLICE_REPR.strip() in repr(wcs)
def test_pixel_to_world_values_different_int_types():
int_sliced = SlicedLowLevelWCS(WCS_SPECTRAL_CUBE, np.s_[:, 0, :])
np64_sliced = SlicedLowLevelWCS(WCS_SPECTRAL_CUBE, np.s_[:,
np.int64(0), :])
pixel_arrays = ([0, 1], [0, 1])
for int_coord, np64_coord in zip(
int_sliced.pixel_to_world_values(*pixel_arrays),
np64_sliced.pixel_to_world_values(*pixel_arrays)):
assert all(int_coord == np64_coord)
def test_celestial_range_rot():
wcs = SlicedLowLevelWCS(WCS_SPECTRAL_CUBE_ROT, [Ellipsis, slice(5, 10)])
assert wcs.pixel_n_dim == 3
assert wcs.world_n_dim == 3
assert wcs.array_shape == (30, 20, 5)
assert wcs.pixel_shape == (5, 20, 30)
assert wcs.world_axis_physical_types == [
'pos.galactic.lat', 'em.freq', 'pos.galactic.lon'
]
assert wcs.world_axis_units == ['deg', 'Hz', 'deg']
assert wcs.pixel_axis_names == ['', '', '']
assert wcs.world_axis_names == ['Latitude', 'Frequency', 'Longitude']
assert_equal(
wcs.axis_correlation_matrix,
[[True, False, True], [False, True, False], [True, False, True]])
assert len(wcs.world_axis_object_components) == 3
assert wcs.world_axis_object_components[0] == ('celestial', 1,
'spherical.lat.degree')
assert wcs.world_axis_object_components[1][:2] == ('spectral', 0)
assert wcs.world_axis_object_components[2] == ('celestial', 0,
'spherical.lon.degree')
assert wcs.world_axis_object_classes['celestial'][0] is SkyCoord
assert wcs.world_axis_object_classes['celestial'][1] == ()
assert isinstance(wcs.world_axis_object_classes['celestial'][2]['frame'],
Galactic)
assert wcs.world_axis_object_classes['celestial'][2]['unit'] is u.deg
assert wcs.world_axis_object_classes['spectral'][0] is Quantity
assert wcs.world_axis_object_classes['spectral'][1] == ()
assert wcs.world_axis_object_classes['spectral'][2] == {}
assert_allclose(wcs.pixel_to_world_values(14, 29, 34), (1, 15, 24))
assert_allclose(wcs.array_index_to_world_values(34, 29, 14), (1, 15, 24))
assert_allclose(wcs.world_to_pixel_values(1, 15, 24), (14., 29., 34.))
assert_equal(wcs.world_to_array_index_values(1, 15, 24), (34, 29, 14))
assert_equal(wcs.pixel_bounds, [(-6, 6), (-2, 18), (5, 15)])
assert str(wcs) == EXPECTED_CELESTIAL_RANGE_ROT_REPR.strip()
assert EXPECTED_CELESTIAL_RANGE_ROT_REPR.strip() in repr(wcs)
def test_dropped_dimensions():
wcs = WCS_SPECTRAL_CUBE
sub = SlicedLowLevelWCS(wcs, np.s_[:, :, :])
assert sub.dropped_world_dimensions == {}
sub = SlicedLowLevelWCS(wcs, np.s_[:, 2:5, :])
assert sub.dropped_world_dimensions == {}
sub = SlicedLowLevelWCS(wcs, np.s_[:, 0])
waocomp = sub.dropped_world_dimensions.pop("world_axis_object_components")
assert len(
waocomp) == 1 and waocomp[0][0] == "spectral" and waocomp[0][1] == 0
waocls = sub.dropped_world_dimensions.pop("world_axis_object_classes")
assert len(waocls) == 1 and "spectral" in waocls and waocls["spectral"][
0] == u.Quantity
validate_info_dict(
sub.dropped_world_dimensions, {
"value": [0.5],
"world_axis_physical_types": ["em.freq"],
"world_axis_names": ["Frequency"],
"world_axis_units": ["Hz"],
"serialized_classes": False,
})
sub = SlicedLowLevelWCS(wcs, np.s_[:, 0, 0])
waocomp = sub.dropped_world_dimensions.pop("world_axis_object_components")
assert len(
waocomp) == 1 and waocomp[0][0] == "spectral" and waocomp[0][1] == 0
waocls = sub.dropped_world_dimensions.pop("world_axis_object_classes")
assert len(waocls) == 1 and "spectral" in waocls and waocls["spectral"][
0] == u.Quantity
validate_info_dict(
sub.dropped_world_dimensions, {
"value": [0.5],
"world_axis_physical_types": ["em.freq"],
"world_axis_names": ["Frequency"],
"world_axis_units": ["Hz"],
"serialized_classes": False,
})
sub = SlicedLowLevelWCS(wcs, np.s_[0, :, 0])
dwd = sub.dropped_world_dimensions
wao_classes = dwd.pop("world_axis_object_classes")
validate_info_dict(
dwd, {
"value": [12.86995801, 20.49217541],
"world_axis_physical_types":
["pos.galactic.lat", "pos.galactic.lon"],
"world_axis_names": ["Latitude", "Longitude"],
"world_axis_units": ["deg", "deg"],
"serialized_classes":
False,
"world_axis_object_components": [
('celestial', 1, 'spherical.lat.degree'),
('celestial', 0, 'spherical.lon.degree')
],
})
assert wao_classes['celestial'][0] is SkyCoord
assert wao_classes['celestial'][1] == ()
assert isinstance(wao_classes['celestial'][2]['frame'], Galactic)
assert wao_classes['celestial'][2]['unit'] is u.deg
sub = SlicedLowLevelWCS(wcs, np.s_[5, :5, 12])
dwd = sub.dropped_world_dimensions
wao_classes = dwd.pop("world_axis_object_classes")
validate_info_dict(
dwd, {
"value": [11.67648267, 21.01921192],
"world_axis_physical_types":
["pos.galactic.lat", "pos.galactic.lon"],
"world_axis_names": ["Latitude", "Longitude"],
"world_axis_units": ["deg", "deg"],
"serialized_classes":
False,
"world_axis_object_components": [
('celestial', 1, 'spherical.lat.degree'),
('celestial', 0, 'spherical.lon.degree')
],
})
assert wao_classes['celestial'][0] is SkyCoord
assert wao_classes['celestial'][1] == ()
assert isinstance(wao_classes['celestial'][2]['frame'], Galactic)
assert wao_classes['celestial'][2]['unit'] is u.deg
def test_1d_sliced_low_level(time_1d_wcs):
sll = SlicedLowLevelWCS(time_1d_wcs, np.s_[10:20])
world = sll.pixel_to_world_values([1, 2])
assert isinstance(world, np.ndarray)
assert np.allclose(world, [27, 29])
def test_world_to_pixel_broadcasting():
wcs = SlicedLowLevelWCS(WCS_SPECTRAL_CUBE, Ellipsis)
assert_allclose(wcs.world_to_pixel_values((10, 10), 20, 25),
((29., 29.), (39., 39.), (44., 44.)))
def test_pixel_to_world_broadcasting():
wcs = SlicedLowLevelWCS(WCS_SPECTRAL_CUBE, Ellipsis)
assert_allclose(wcs.pixel_to_world_values((29, 29), 39, 44),
((10, 10), (20, 20), (25, 25)))