def test_ShiftModel():
# Shift by a scalar
m = models.Shift(42)
assert m(0) == 42
assert_equal(m([1, 2]), [43, 44])
# Shift by a list
m = models.Shift([42, 43], n_models=2)
assert_equal(m(0), [42, 43])
assert_equal(m([1, 2], model_set_axis=False), [[43, 44], [44, 45]])
def test_calculate_affine_matrices(angle, scale, xoffset, yoffset):
m = ((models.Scale(scale) & models.Scale(scale)) | models.Rotation2D(angle)
| (models.Shift(xoffset) & models.Shift(yoffset)))
affine = adwcs.calculate_affine_matrices(m, (100, 100))
assert_allclose(affine.offset, (yoffset, xoffset), atol=1e-10)
angle = math.radians(angle)
assert_allclose(affine.matrix,
((scale * math.cos(angle), scale * math.sin(angle)),
(-scale * math.sin(angle), scale * math.cos(angle))),
atol=1e-10)
def test_transforms_compound(tmpdir):
tree = {
'compound':
astmodels.Shift(1) & astmodels.Shift(2) | astmodels.Sky2Pix_TAN()
| astmodels.Rotation2D()
| astmodels.AffineTransformation2D([[2, 0], [0, 2]], [42, 32]) +
astmodels.Rotation2D(32)
}
helpers.assert_roundtrip_tree(tree, tmpdir)
def test_to_fits_sip_pc_normalization(gwcs_simple_imaging_units, matrix_type):
y, x = np.mgrid[:1024:10, :1024:10]
xflat = np.ravel(x[1:-1, 1:-1])
yflat = np.ravel(y[1:-1, 1:-1])
bounding_box = ((0, 1024), (0, 1024))
# create a simple imaging WCS without distortions:
cdmat = np.array([[1.29e-5, 5.95e-6], [5.02e-6, -1.26e-5]])
aff = models.AffineTransformation2D(matrix=cdmat, name='rotation')
offx = models.Shift(-501, name='x_translation')
offy = models.Shift(-501, name='y_translation')
wcslin = (offx & offy) | aff
n2c = models.RotateNative2Celestial(5.63, -72.05, 180, name='sky_rotation')
tan = models.Pix2Sky_TAN(name='tangent_projection')
wcs_forward = wcslin | tan | n2c
sky_cs = cf.CelestialFrame(reference_frame=coord.ICRS(), name='sky')
pipeline = [('detector', wcs_forward), (sky_cs, None)]
wcs_lin = wcs.WCS(
input_frame=cf.Frame2D(name='detector'),
output_frame=sky_cs,
forward_transform=pipeline
)
_, _, celestial_group = wcs_lin._separable_groups(detect_celestial=True)
fits_wcs = wcs_lin._to_fits_sip(
celestial_group=celestial_group,
keep_axis_position=False,
bounding_box=bounding_box,
max_pix_error=0.1,
degree=None,
max_inv_pix_error=0.1,
inv_degree=None,
npoints=32,
crpix=None,
projection='TAN',
matrix_type=matrix_type,
verbose=False
)
fitssip = astwcs.WCS(fits_wcs)
fitsvalx, fitsvaly = fitssip.wcs_pix2world(xflat, yflat, 0)
inv_fitsvalx, inv_fitsvaly = fitssip.wcs_world2pix(fitsvalx, fitsvaly, 0)
gwcsvalx, gwcsvaly = wcs_lin(xflat, yflat)
assert_allclose(gwcsvalx, fitsvalx, atol=4e-11, rtol=0)
assert_allclose(gwcsvaly, fitsvaly, atol=4e-11, rtol=0)
assert_allclose(xflat, inv_fitsvalx, atol=5e-9, rtol=0)
assert_allclose(yflat, inv_fitsvaly, atol=5e-9, rtol=0)
def fpa2asdf(fpafile, outname, ref_kw):
"""
Create an asdf reference file with the FPA description.
The CDP2 delivery includes a fits file - "FPA.fpa" which is the
input to this function. This file is converted to asdf and is a
reference file of type "FPA".
nirspec_fs_ref_tools.fpa2asdf('Ref_Files/CoordTransform/Description/FPA.fpa', 'fpa.asdf')
Parameters
----------
fpafile : str
A fits file with FPA description (FPA.fpa)
outname : str
Name of output ASDF file.
"""
with open(fpafile) as f:
lines = [l.strip() for l in f.readlines()]
# NRS1
ind = lines.index("*SCA491_PitchX")
scalex_nrs1 = models.Scale(1 / float(lines[ind + 1]), name='fpa_scale_x')
ind = lines.index("*SCA491_PitchY")
scaley_nrs1 = models.Scale(1 / float(lines[ind + 1]), name='fpa_scale_y')
ind = lines.index("*SCA491_RotAngle")
rot_nrs1 = models.Rotation2D(np.rad2deg(-float(lines[ind + 1])),
name='fpa_rotation')
ind = lines.index("*SCA491_PosX")
shiftx_nrs1 = models.Shift(-float(lines[ind + 1]), name='fpa_shift_x')
ind = lines.index("*SCA491_PosY")
shifty_nrs1 = models.Shift(-float(lines[ind + 1]), name='fpa_shift_y')
# NRS2
ind = lines.index("*SCA492_PitchX")
scalex_nrs2 = models.Scale(1 / float(lines[ind + 1]), name='fpa_scale_x')
ind = lines.index("*SCA492_PitchY")
scaley_nrs2 = models.Scale(1 / float(lines[ind + 1]), name='fpa_scale_y')
ind = lines.index("*SCA492_RotAngle")
rot_nrs2 = models.Rotation2D(np.rad2deg(float(lines[ind + 1])),
name='fpa_rotation')
ind = lines.index("*SCA492_PosX")
shiftx_nrs2 = models.Shift(-float(lines[ind + 1]), name='fpa_shift_x')
ind = lines.index("*SCA492_PosY")
shifty_nrs2 = models.Shift(-float(lines[ind + 1]), name='fpa_shift_y')
tree = ref_kw.copy()
tree['NRS1'] = (shiftx_nrs1 & shifty_nrs1) | rot_nrs1 | (scalex_nrs1
& scaley_nrs1)
tree['NRS2'] = (shiftx_nrs2 & shifty_nrs2) | rot_nrs2 | (scalex_nrs2
& scaley_nrs2)
fasdf = AsdfFile()
fasdf.tree = tree
fasdf.write_to(outname)
return fasdf
def time_init_7_with_units():
aff = models.AffineTransformation2D(matrix=[[1, 0], [0, 1]] * u.arcsec,
translation=[0, 0] * u.arcsec)
aff.input_units_equivalencies = {
'x': u.pixel_scale(1 * u.arcsec / u.pix),
'y': u.pixel_scale(1 * u.arcsec / u.pix)
}
m = (models.Shift(-10.5 * u.pix) & models.Shift(-13.2 * u.pix) | aff
| models.Scale(.01 * u.arcsec) & models.Scale(.04 * u.arcsec)
| models.Pix2Sky_TAN() | models.RotateNative2Celestial(
5.6 * u.deg, -72.05 * u.deg, 180 * u.deg))
def gwcs_spec_cel_time_4d():
"""
A complex 4D mixed celestial + spectral + time WCS.
"""
# spectroscopic frame:
wave_model = models.Shift(-5) | models.Multiply(3.7) | models.Shift(20)
wave_model.bounding_box = (7, 50)
wave_frame = cf.SpectralFrame(name='wave',
unit=u.m,
axes_order=(0, ),
axes_names=('lambda', ))
# time frame:
time_model = models.Identity(1) # models.Linear1D(10, 0)
time_frame = cf.TemporalFrame(Time("2010-01-01T00:00"),
name='time',
unit=u.s,
axes_order=(3, ))
# Values from data/acs.hdr:
crpix = (12, 13)
crval = (5.63, -72.05)
cd = [[1.291E-05, 5.9532E-06], [5.02215E-06, -1.2645E-05]]
aff = models.AffineTransformation2D(matrix=cd, name='rotation')
offx = models.Shift(-crpix[0], name='x_translation')
offy = models.Shift(-crpix[1], name='y_translation')
wcslin = models.Mapping((1, 0)) | (offx & offy) | aff
tan = models.Pix2Sky_TAN(name='tangent_projection')
n2c = models.RotateNative2Celestial(*crval, 180, name='sky_rotation')
cel_model = wcslin | tan | n2c
icrs = cf.CelestialFrame(reference_frame=coord.ICRS(),
name='sky',
axes_order=(2, 1))
wcs_forward = wave_model & cel_model & time_model
comp_frm = cf.CompositeFrame(frames=[wave_frame, icrs, time_frame],
name='TEST 4D FRAME')
detector_frame = cf.CoordinateFrame(name="detector",
naxes=4,
axes_order=(0, 1, 2, 3),
axes_type=("pixel", "pixel", "pixel",
"pixel"),
unit=(u.pix, u.pix, u.pix, u.pix))
w = wcs.WCS(forward_transform=wcs_forward,
output_frame=comp_frm,
input_frame=detector_frame)
w.bounding_box = ((0, 63), (0, 127), (0, 255), (0, 9))
w.array_shape = (10, 256, 128, 64)
w.pixel_shape = (64, 128, 256, 10)
return w
def test_compound_bounding_box():
trans3 = models.Shift(10) & models.Scale(2) & models.Shift(-1)
pipeline = [('detector', trans3), ('sky', None)]
w = wcs.WCS(pipeline)
cbb = {
1: ((-1, 10), (6, 15)),
2: ((-1, 5), (3, 17)),
3: ((-3, 7), (1, 27)),
}
if new_bbox:
# Test attaching a valid bounding box (ignoring input 'x')
w.attach_compound_bounding_box(cbb, [('x',)])
from astropy.modeling.bounding_box import CompoundBoundingBox
cbb = CompoundBoundingBox.validate(trans3, cbb, selector_args=[('x',)], order='F')
assert w.bounding_box == cbb
assert w.bounding_box is trans3.bounding_box
# Test evaluating
assert_allclose(w(13, 2, 1), (np.nan, np.nan, np.nan))
assert_allclose(w(13, 2, 2), (np.nan, np.nan, np.nan))
assert_allclose(w(13, 0, 3), (np.nan, np.nan, np.nan))
# No bounding box for selector
with pytest.raises(RuntimeError):
w(13, 13, 4)
# Test attaching a invalid bounding box (not ignoring input 'x')
with pytest.raises(ValueError):
w.attach_compound_bounding_box(cbb, [('x', False)])
else:
with pytest.raises(NotImplementedError) as err:
w.attach_compound_bounding_box(cbb, [('x',)])
assert str(err.value) == 'Compound bounding box is not supported for your version of astropy'
# Test that bounding_box with quantities can be assigned and evaluates
trans = models.Shift(10 * u .pix) & models.Shift(2 * u.pix)
pipeline = [('detector', trans), ('sky', None)]
w = wcs.WCS(pipeline)
cbb = {
1 * u.pix: (1 * u.pix, 5 * u.pix),
2 * u.pix: (2 * u.pix, 6 * u.pix)
}
if new_bbox:
w.attach_compound_bounding_box(cbb, [('x1',)])
from astropy.modeling.bounding_box import CompoundBoundingBox
cbb = CompoundBoundingBox.validate(trans, cbb, selector_args=[('x1',)], order='F')
assert w.bounding_box == cbb
assert w.bounding_box is trans.bounding_box
assert_allclose(w(-1*u.pix, 1*u.pix), (np.nan, np.nan))
assert_allclose(w(7*u.pix, 2*u.pix), (np.nan, np.nan))
else:
with pytest.raises(NotImplementedError) as err:
w.attach_compound_bounding_box(cbb, [('x1',)])
def test_validate_transform(tmp_path):
"""
Tests that custom types, like transform, can be validated.
"""
file_path = tmp_path / "test.asdf"
with TransformModel(transform=models.Shift(1) & models.Shift(2),
strict_validation=True) as m:
m.validate()
m.save(file_path)
with TransformModel(file_path, strict_validation=True) as m:
m.validate()
def test_domain():
trans3 = models.Shift(10) & models.Scale(2) & models.Shift(-1)
pipeline = [('detector', trans3), ('sky', None)]
w = wcs.WCS(pipeline)
bb = ((-1, 10), (6, 15))
with pytest.raises(DimensionalityError):
w.bounding_box = bb
trans2 = models.Shift(10) & models.Scale(2)
pipeline = [('detector', trans2), ('sky', None)]
w = wcs.WCS(pipeline)
w.bounding_box = bb
assert w.bounding_box == w.forward_transform.bounding_box[::-1]
def test_validate_transform():
"""
Tests that custom types, like transform, can be validated.
"""
m = CollimatorModel(model=models.Shift(1) & models.Shift(2),
strict_validation=True)
m.meta.description = "Test validate a WCS reference file."
m.meta.author = "ND"
m.meta.pedigree = "GROUND"
m.meta.useafter = "2018/06/18"
m.meta.reftype = "collimator"
m.validate()
def load_wcs(input_model, reference_files={}):
"""
Create a gWCS object and store it in ``Model.meta``.
Parameters
----------
input_model : `~jwst.datamodels.DataModel`
The exposure.
reference_files : dict
A dict {reftype: reference_file_name} containing all
reference files that apply to this exposure.
"""
if "wcsinfo" not in input_model.meta:
input_model.meta.cal_step.assign_wcs = "SKIPPED"
log.warning("assign_wcs: SKIPPED")
return input_model
else:
output_model = input_model.copy()
shift_by_crpix = models.Shift(
-(input_model.meta.wcsinfo.crpix1 - 1) * u.pix
) & models.Shift(-(input_model.meta.wcsinfo.crpix2 - 1) * u.pix)
pix2sky = getattr(
models, "Pix2Sky_{}".format(input_model.meta.wcsinfo.ctype1[-3:])
)()
celestial_rotation = models.RotateNative2Celestial(
input_model.meta.wcsinfo.crval1 * u.deg,
input_model.meta.wcsinfo.crval2 * u.deg,
180 * u.deg,
)
pix2sky.input_units_equivalencies = {
"x": u.pixel_scale(input_model.meta.wcsinfo.cdelt1 * u.deg / u.pix),
"y": u.pixel_scale(input_model.meta.wcsinfo.cdelt2 * u.deg / u.pix),
}
det2sky = shift_by_crpix | pix2sky | celestial_rotation
det2sky.name = "linear_transform"
detector_frame = cf.Frame2D(
name="detector", axes_names=("x", "y"), unit=(u.pix, u.pix)
)
sky_frame = cf.CelestialFrame(
reference_frame=getattr(
coord, input_model.meta.coordinates.reference_frame
)(),
name="sky_frame",
unit=(u.deg, u.deg),
)
pipeline = [(detector_frame, det2sky), (sky_frame, None)]
wcs = WCS(pipeline)
output_model.meta.wcs = wcs
output_model.meta.cal_step.assign_wcs = "COMPLETE"
return output_model
def fitswcs_linear(header):
"""
Create WCS linear transforms for any axes not associated with
celestial coordinates. We require that each world axis aligns
precisely with only a single pixel axis.
Parameters
----------
header : `astropy.io.fits.Header` or dict
FITS Header or dict with basic FITS WCS keywords.
"""
# We *always* want the wavelength solution model to be called "WAVE"
# even if the CTYPE keyword is "AWAV"
model_name_mapping = {"AWAV": "WAVE"}
if isinstance(header, fits.Header):
wcs_info = read_wcs_from_header(header)
elif isinstance(header, dict):
wcs_info = header
else:
raise TypeError("Expected a FITS Header or a dict.")
cd = wcs_info['CD']
crpix = wcs_info['CRPIX']
crval = wcs_info['CRVAL']
# get the part of the CD matrix corresponding to the imaging axes
sky_axes, spec_axes, unknown = get_axes(wcs_info)
if not sky_axes and len(unknown) == 2:
unknown = []
linear_models = []
for ax in spec_axes + unknown:
pixel_axes = _get_contributing_axes(wcs_info, ax)
if len(pixel_axes) == 1:
pixel_axis = pixel_axes[0]
linear_model = (models.Shift(1 - crpix[pixel_axis],
name='crpix' + str(pixel_axis + 1))
| models.Scale(cd[ax, pixel_axis])
| models.Shift(crval[ax]))
ctype = wcs_info['CTYPE'][ax][:4].upper()
linear_model.name = model_name_mapping.get(ctype, ctype)
linear_model.outputs = (wcs_info['CTYPE'][ax], )
linear_model.meta.update({
'input_axes': pixel_axes,
'output_axes': [ax]
})
linear_models.append(linear_model)
else:
raise ValueError(f"Axis {ax} depends on more than one input axis")
return linear_models
def test_domain():
trans3 = models.Shift(10) & models.Scale(2) & models.Shift(-1)
pipeline = [('detector', trans3), ('sky', None)]
w = wcs.WCS(pipeline)
domain = [{'lower': -1, 'upper': 10, 'include_lower': True, 'include_upper': False, 'step': .1},
{'lower': 6, 'upper': 15, 'include_lower': False, 'include_upper': True, 'step': .5}]
with pytest.raises(ValueError):
w.domain = domain
trans2 = models.Shift(10) & models.Scale(2)
pipeline = [('detector', trans2), ('sky', None)]
w = wcs.WCS(pipeline)
w.domain = domain
assert w.domain == w.forward_transform.meta['domain']
def test_coupled_compound_model_nested():
ccm = CoupledCompoundModel("&", m.Shift(5) & m.Scale(2), m.Scale(10) | m.Shift(3))
new = roundtrip_object(ccm)
assert isinstance(new, CoupledCompoundModel)
assert isinstance(new.left, CompoundModel)
assert isinstance(new.left.left, m.Shift)
assert isinstance(new.left.right, m.Scale)
assert isinstance(new.right, CompoundModel)
assert isinstance(new.right.left, m.Scale)
assert isinstance(new.right.right, m.Shift)
assert ccm.n_inputs == new.n_inputs
assert ccm.inputs == new.inputs
def test_create_wcs(tmpdir):
m1 = models.Shift(12.4) & models.Shift(-2)
icrs = cf.CelestialFrame(name='icrs', reference_frame=coord.ICRS())
det = cf.Frame2D(name='detector', axes_order=(0, 1))
gw1 = wcs.WCS(output_frame='icrs',
input_frame='detector',
forward_transform=m1)
gw2 = wcs.WCS(output_frame='icrs', forward_transform=m1)
gw3 = wcs.WCS(output_frame=icrs, input_frame=det, forward_transform=m1)
assert_wcs_roundtrip(gw1, tmpdir)
assert_wcs_roundtrip(gw2, tmpdir)
assert_wcs_roundtrip(gw3, tmpdir)
def gwcs_cube_with_separable_time(request):
"""
A mixed celestial + time WCS.
"""
cube_size = (64, 32, 128)
axes_order = request.param
time_axes_order = (axes_order.index(2), )
cel_axes_order = (axes_order.index(0), axes_order.index(1))
detector_frame = cf.CoordinateFrame(name="detector",
naxes=3,
axes_order=(0, 1, 2),
axes_type=("pixel", "pixel", "pixel"),
unit=(u.pix, u.pix, u.pix))
# time frame:
time_model = models.Identity(1) # models.Linear1D(10, 0)
time_frame = cf.TemporalFrame(Time("2010-01-01T00:00"),
name='time',
unit=u.s,
axes_order=time_axes_order)
# Values from data/acs.hdr:
crpix = (12, 13)
crval = (5.63, -72.05)
cd = [[1.291E-05, 5.9532E-06], [5.02215E-06, -1.2645E-05]]
aff = models.AffineTransformation2D(matrix=cd, name='rotation')
offx = models.Shift(-crpix[0], name='x_translation')
offy = models.Shift(-crpix[1], name='y_translation')
wcslin = models.Mapping((1, 0)) | (offx & offy) | aff
tan = models.Pix2Sky_TAN(name='tangent_projection')
n2c = models.RotateNative2Celestial(*crval, 180, name='sky_rotation')
cel_model = wcslin | tan | n2c
icrs = cf.CelestialFrame(reference_frame=coord.ICRS(),
name='sky',
axes_order=cel_axes_order)
wcs_forward = (cel_model & time_model) | models.Mapping(axes_order)
comp_frm = cf.CompositeFrame(frames=[icrs, time_frame],
name='TEST 3D FRAME WITH TIME')
w = wcs.WCS(forward_transform=wcs_forward,
output_frame=comp_frm,
input_frame=detector_frame)
w.bounding_box = tuple((0, k - 1) for k in cube_size)
w.pixel_shape = cube_size
w.array_shape = w.pixel_shape[::-1]
return w
def test_create_wcs(tmpdir):
m1 = models.Shift(12.4) & models.Shift(-2)
m2 = models.Scale(2) & models.Scale(-2)
icrs = cf.CelestialFrame(name='icrs', reference_frame=coord.ICRS())
det = cf.Frame2D(name='detector', axes_order=(0, 1))
gw1 = wcs.WCS(output_frame='icrs',
input_frame='detector',
forward_transform=m1)
gw2 = wcs.WCS(output_frame='icrs', forward_transform=m1)
gw3 = wcs.WCS(output_frame=icrs, input_frame=det, forward_transform=m1)
tree = {'gw1': gw1, 'gw2': gw2, 'gw3': gw3}
helpers.assert_roundtrip_tree(tree, tmpdir)
def test_compound_bounding_box_pass_with_ignored():
model = models.Shift(1) & models.Shift(2) & models.Identity(1)
model.inputs = ('x', 'y', 'slit_id')
bbox = {(0,): (-0.5, 1047.5),
(1,): (-0.5, 2047.5), }
cbbox = CompoundBoundingBox.validate(model, bbox, selector_args=[('slit_id', True)],
ignored=['y'], order='F')
model.bounding_box = cbbox
model = models.Shift(1) & models.Shift(2) & models.Identity(1)
model.inputs = ('x', 'y', 'slit_id')
bind_compound_bounding_box(model, bbox, selector_args=[('slit_id', True)],
ignored=['y'], order='F')
assert model.bounding_box == cbbox
def subarray_transform(input_model):
"""
Inputs are in full frame coordinates.
If a subarray observation - shift the inputs.
"""
xstart = input_model.meta.subarray.xstart
ystart = input_model.meta.subarray.ystart
if xstart is None:
xstart = 1
if ystart is None:
ystart = 1
subarray2full = astmodels.Shift(xstart - 1) & astmodels.Shift(ystart - 1)
return subarray2full
def create_channel_selector(alpha, lam, channel, beta, ch_v2, ch_v3):
if channel == 1:
nslice = range(101, 122) #21
elif channel == 2:
nslice = range(201, 218) #17
elif channel == 3:
nslice = 16
elif channel == 4:
nslice = 12
else:
raise ValueError("Incorrect channel #")
# transformation from local system (alpha, beta) to V2/V3
p_v2 = models.Polynomial2D(2)
p_v3 = models.Polynomial2D(2)
p_v2.c0_0, p_v2.c0_1, p_v2.c1_0, p_v2.c1_1 = ch_v2[1:]
p_v3.c0_0, p_v3.c0_1, p_v3.c1_0, p_v3.c1_1 = ch_v3[1:]
ab_v2v3 = p_v2 & p_v3
ind = []
for i in range(5):
for j in range(5):
ind.append((i, j))
selector = {}
# In the paper the formula is (x-xs)^j*y^i, so the 'x' corresponds
# to y in modeling. - swapped in Mapping
axs = alpha.field('x_s')
lxs = lam.field('x_s')
#for i in range(nslice):
for i, sl in enumerate(nslice):
ashift = models.Shift(axs[i])
lshift = models.Shift(lxs[i])
palpha = models.Polynomial2D(8)
plam = models.Polynomial2D(8)
for index, coeff in zip(ind, alpha[i][1:]):
setattr(palpha, 'c{0}_{1}'.format(index[0], index[1]), coeff)
for index, coeff in zip(ind, lam[i][1:]):
setattr(plam, 'c{0}_{1}'.format(index[0], index[1]), coeff)
alpha_model = ashift & models.Identity(1) | palpha
lam_model = lshift & models.Identity(1) | plam
beta_model = models.Const1D(beta[0] + (i - 1) * beta[1])
# Note swapping of axes
a_b_l = models.Mapping(
(1, 0, 0, 1, 0)) | alpha_model & beta_model & lam_model
v2_v3_l = a_b_l | models.Mapping(
(0, 1, 0, 1, 2)) | ab_v2v3 & models.Identity(1)
selector[sl] = v2_v3_l
# return alpha, beta, lambda
return selector
def test_initialize_wcs_with_list():
# test that you can initialize a wcs with a pipeline that is a list
# containing both Step() and (frame, transform) tuples
# make pipline consisting of tuples and Steps
shift1 = models.Shift(10 * u .pix) & models.Shift(2 * u.pix)
shift2 = models.Shift(3 * u.pix)
pipeline = [('detector', shift1), wcs.Step('extra_step', shift2)]
extra_step = ('extra_step', None)
pipeline.append(extra_step)
# make sure no warnings occur when creating wcs with this pipeline
wcs.WCS(pipeline)
def test_compound_model_mixed_array_scalar_bounding_box():
"""Regression test for issue #12319"""
model = models.Shift(1) & models.Shift(2) & models.Identity(1)
model.inputs = ('x', 'y', 'slit_id')
bbox = ModelBoundingBox.validate(model, ((-0.5, 1047.5), (-0.5, 2047.5), (-np.inf, np.inf)), order='F')
model.bounding_box = bbox
x = np.array([1000, 1001])
y = np.array([2000, 2001])
slit_id = 0
# Everything works when its all in the bounding box
value0 = model(x, y, slit_id)
value1 = model(x, y, slit_id, with_bounding_box=True)
assert_equal(value0, value1)
def test_custom_and_analytical():
m1 = custom_and_analytical_inverse()
m = astmodels.Shift(1) & astmodels.Shift(2) | m1
fa = AsdfFile()
fa.tree['model'] = m
fa.write_to('custom_and_analytical_inverse.asdf')
f = asdf.open('custom_and_analytical_inverse.asdf')
assert f.tree['model'].inverse is not None
m = astmodels.Shift(1) & m1
fa = AsdfFile()
fa.tree['model'] = m
fa.write_to('custom_and_analytical_inverse.asdf')
f = asdf.open('custom_and_analytical_inverse.asdf')
assert f.tree['model'].inverse is not None
def gwcs_cube_with_separable_spectral(request):
cube_size = (128, 64, 100)
axes_order = request.param
spectral_axes_order = (axes_order.index(2), )
cel_axes_order = (axes_order.index(0), axes_order.index(1))
# Values from data/acs.hdr:
crpix = (64, 32)
crval = (5.63056810618, -72.0545718428)
cd = [[1.29058667557984E-05, 5.95320245884555E-06],
[5.02215195623825E-06, -1.2645010396976E-05]]
aff = models.AffineTransformation2D(matrix=cd, name='rotation')
offx = models.Shift(-crpix[0], name='x_translation')
offy = models.Shift(-crpix[1], name='y_translation')
wcslin = (offx & offy) | aff
tan = models.Pix2Sky_TAN(name='tangent_projection')
n2c = models.RotateNative2Celestial(*crval, 180, name='sky_rotation')
icrs = cf.CelestialFrame(reference_frame=coord.ICRS(),
name='sky',
axes_order=cel_axes_order)
spec = cf.SpectralFrame(name='wave',
unit=[
u.m,
],
axes_order=spectral_axes_order,
axes_names=('lambda', ))
comp_frm = cf.CompositeFrame(frames=[icrs, spec],
name='TEST 3D FRAME WITH SPECTRAL AXIS')
wcs_forward = ((wcslin & models.Identity(1)) | (tan & models.Identity(1)) |
(n2c & models.Identity(1)) | models.Mapping(axes_order))
detector_frame = cf.CoordinateFrame(name="detector",
naxes=3,
axes_order=(0, 1, 2),
axes_type=("pixel", "pixel", "pixel"),
unit=(u.pix, u.pix, u.pix))
w = wcs.WCS(forward_transform=wcs_forward,
output_frame=comp_frm,
input_frame=detector_frame)
w.bounding_box = tuple((0, k - 1) for k in cube_size)
w.pixel_shape = cube_size
w.array_shape = w.pixel_shape[::-1]
return w, axes_order
def test_2d_affine_transform():
"""Test a simple 2D transform with and without flux conservation"""
size = 10
x = np.arange(size * size, dtype=float).reshape(size, size)
# We still lose the pixels at either end, resulting in a 18x18-pixel array
m = models.Shift(0.5) | models.Scale(2) | models.Shift(-0.5)
dg = transform.DataGroup([x], [transform.Transform(m & m)])
output = dg.transform()
y = output['data'][1:-1, 1:-1].reshape(8,2,8,2).mean(axis=3).mean(axis=1)
assert np.array_equal(x[1:-1, 1:-1], y)
output = dg.transform(conserve=True)
y = output['data'][1:-1, 1:-1].reshape(8,2,8,2).sum(axis=3).sum(axis=1)
assert np.array_equal(x[1:-1, 1:-1], y)
def create_poly_models(data, channel, coeff_names, name):
"""
Create a 2D polynomial model for the transformation
detector --> local MIRI frame
Works for alpha and lambda coordinates.
"""
nslices = len(data)
sl = channel * 100 + np.arange(1, nslices + 1)
transforms = {}
for i in range(nslices):
sl = channel * 100 + i + 1
al = data[i]
xs = al[0]
coeffs = {}
for c, val in zip(coeff_names, al[1:]):
coeffs[c] = val
# As of CDP-8b both the IDT transform as the pipeline use 0-indexed pixels, and
# include the 4 reference pixels in their counting. Therefore we do not need to
# apply any index shift, just the transform.
thisxform = models.Identity(1) & models.Shift(
-xs) | models.Polynomial2D(8, name=name, **coeffs)
# Put the models together
transforms[sl] = thisxform
return transforms
def _generate_wcs_transform(dispaxis):
"""Create mock gwcs.WCS object for resampled s2d data"""
detector = cf.Frame2D(name='detector',
axes_order=(0, 1),
unit=(u.pix, u.pix))
icrs = cf.CelestialFrame(name='icrs',
reference_frame=coord.ICRS(),
axes_order=(0, 1),
unit=(u.deg, u.deg),
axes_names=('RA', 'DEC'))
spec = cf.SpectralFrame(name='spec',
axes_order=(2, ),
unit=(u.micron, ),
axes_names=('lambda', ))
world = cf.CompositeFrame(name="world", frames=[icrs, spec])
if dispaxis == 1:
mapping = models.Mapping((0, 1, 0))
if dispaxis == 2:
mapping = models.Mapping((0, 1, 1))
transform = mapping | (models.Const1D(42) & models.Const1D(42)
& (models.Shift(30) | models.Scale(0.1)))
pipeline = [(detector, transform), (world, None)]
wcs = WCS(pipeline)
return wcs
def create_xy_models(data, channel, coeff_names, name):
"""
Create a 2D polynomial model for the transformation
local_MIRI --> detector frame.
"""
nslices = len(data)
sl = channel * 100 + np.arange(1, nslices + 1)
shname = "shift_{0}".format(name)
pname = "polynomial_{0}".format(name)
transforms = {}
for i in range(nslices):
sl = channel * 100 + i + 1
al = data[i]
xs = al[0]
coeffs = {}
for c, val in zip(coeff_names, al[1:]):
coeffs[c] = val
# As of CDP-8b both the IDT transform as the pipeline use 0-indexed pixels, and
# include the 4 reference pixels in their counting. Therefore we do not need to
# apply any index shift, just the transform.
thisxform = models.Shift(
-xs, name=shname) & models.Identity(1) | models.Polynomial2D(
8, name=pname, **coeffs)
transforms[sl] = thisxform
return transforms
def ifu(input_model, reference_files):
"""
Create the WCS pipeline for a MIRI IFU observation.
"""
#reference_files = {'distortion': 'jwst_miri_distortion_00001.asdf', #files must hold 2 channels each
#'specwcs': 'jwst_miri_specwcs_00001.asdf',
#'regions': 'jwst_miri_regions_00001.asdf',
#'v2v3': 'jwst_miri_v2v3_00001.asdf'
#'wavelengthrange': 'jwst_miri_wavelengthrange_0001.asdf'}
detector = cf.Frame2D(name='detector', axes_order=(0, 1), unit=(u.pix, u.pix))
alpha_beta = cf.Frame2D(name='alpha_beta_spatial', axes_order=(0, 1), unit=(u.arcsec, u.arcsec), axes_names=('alpha', 'beta'))
spec_local = cf.SpectralFrame(name='alpha_beta_spectral', axes_order=(2,), unit=(u.micron,), axes_names=('lambda',))
miri_focal = cf.CompositeFrame([alpha_beta, spec_local], name='alpha_beta')
xyan_spatial = cf.Frame2D(name='Xan_Yan_spatial', axes_order=(0, 1), unit=(u.arcmin, u.arcmin), axes_names=('v2', 'v3'))
spec = cf.SpectralFrame(name='Xan_Yan_spectral', axes_order=(2,), unit=(u.micron,), axes_names=('lambda',))
xyan = cf.CompositeFrame([xyan_spatial, spec], name='Xan_Yan')
v23_spatial = cf.Frame2D(name='V2_V3_spatial', axes_order=(0, 1), unit=(u.arcmin, u.arcmin), axes_names=('v2', 'v3'))
spec = cf.SpectralFrame(name='V2_v3_spectral', axes_order=(2,), unit=(u.micron,), axes_names=('lambda',))
v2v3 = cf.CompositeFrame([v23_spatial, spec], name='V2_V3')
icrs = cf.CelestialFrame(name='icrs', reference_frame=coord.ICRS(),
axes_order=(0, 1), unit=(u.deg, u.deg), axes_names=('RA', 'DEC'))
sky = cf.CompositeFrame([icrs, spec], name='sky_and_wavelength')
det2alpha_beta = (detector_to_alpha_beta(input_model, reference_files)).rename(
"detector_to_alpha_beta")
ab2xyan = (alpha_beta2XanYan(input_model, reference_files)).rename("alpha_beta_to_Xan_Yan")
xyan2v23 = models.Identity(1) & (models.Shift(7.8) | models.Scale(-1)) & models.Identity(1)
fitswcs_transform = pointing.create_fitswcs_transform(input_model) & models.Identity(1)
pipeline = [(detector, det2alpha_beta),
(miri_focal, ab2xyan),
(xyan, xyan2v23),
(v2v3, fitswcs_transform),
(sky, None)
]
return pipeline