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from __future__ import absolute_import, division, print_function
import shutil
import os
from astropy import wcs
from astropy.io import fits
from .. import updatewcs
from ..updatewcs import apply_corrections
from ..distortion import utils as dutils
from ..wcsutil import HSTWCS
import numpy as np
from numpy.testing import utils
import pytest
from . import data
data_path = os.path.split(os.path.abspath(data.__file__))[0]
def get_filepath(filename, directory=data_path):
return os.path.join(directory, filename)
class TestStwcs(object):
def setup_class(self):
acs_orig_file = get_filepath('j94f05bgq_flt.fits')
current_dir = os.path.abspath(os.path.curdir)
self.ref_file = get_filepath('j94f05bgq_flt_r.fits', current_dir)
self.acs_file = get_filepath('j94f05bgq_flt.fits', current_dir)
try:
os.remove(self.acs_file)
os.remove(self.ref_file)
except OSError:
pass
idctab = get_filepath('postsm4_idc.fits')
npol_file = get_filepath('qbu16424j_npl.fits')
d2imfile = get_filepath('new_wfc_d2i.fits ')
shutil.copyfile(acs_orig_file, self.acs_file)
fits.setval(self.acs_file, ext=0, keyword="IDCTAB", value=idctab)
fits.setval(self.acs_file, ext=0, keyword="NPOLFILE", value=npol_file)
fits.setval(self.acs_file, ext=0, keyword="D2IMFILE", value=d2imfile)
updatewcs.updatewcs(self.acs_file)
#self.ref_file = ref_file
shutil.copyfile(self.acs_file, self.ref_file)
self.w1 = HSTWCS(self.acs_file, ext=1)
self.w4 = HSTWCS(self.acs_file, ext=4)
self.w = wcs.WCS()
def test_default(self):
crval = np.array([0., 0.])
crpix = np.array([0., 0.])
cdelt = np.array([1., 1.])
pc = np.array([[1., 0], [0., 1.]])
ctype = np.array(['', ''])
utils.assert_almost_equal(self.w.wcs.crval, crval)
utils.assert_almost_equal(self.w.wcs.crpix, crpix)
utils.assert_almost_equal(self.w.wcs.cdelt, cdelt)
utils.assert_almost_equal(self.w.wcs.pc, pc)
assert((self.w.wcs.ctype == np.array(['', ''])).all())
def test_simple_sci1(self):
"""
A simple sanity check that CRPIX corresponds to CRVAL within wcs
"""
px1 = np.array([self.w1.wcs.crpix])
rd1 = np.array([self.w1.wcs.crval])
assert(((self.w1.all_pix2world(px1, 1) - rd1) < 5E-7).all())
def test_simple_sci2(self):
"""
A simple sanity check that CRPIX corresponds to CRVAL within wcs
"""
px4 = np.array([self.w4.wcs.crpix])
rd4 = np.array([self.w4.wcs.crval])
assert(((self.w4.all_pix2world(px4, 1) - rd4) < 2E-6).all())
def test_pipeline_sci1(self):
"""
Internal consistency check of the wcs pipeline
"""
px = np.array([[100, 125]])
sky1 = self.w1.all_pix2world(px, 1)
dpx1 = self.w1.det2im(px, 1)
#fpx1 = dpx1 + (self.w1.sip_pix2foc(dpx1,1)-dpx1) + (self.w1.p4_pix2foc(dpx1,1)-dpx1)
fpx1 = dpx1 + (self.w1.sip_pix2foc(dpx1, 1)-dpx1+self.w1.wcs.crpix) + \
(self.w1.p4_pix2foc(dpx1, 1)-dpx1)
pipelinepx1 = self.w1.wcs_pix2world(fpx1, 1)
utils.assert_almost_equal(pipelinepx1, sky1)
def test_pipeline_sci2(self):
"""
Internal consistency check of the wcs pipeline
"""
px = np.array([[100, 125]])
sky4 = self.w4.all_pix2world(px, 1)
dpx4 = self.w4.det2im(px, 1)
fpx4 = dpx4 + (self.w4.sip_pix2foc(dpx4, 1)-dpx4 + self.w4.wcs.crpix) + \
(self.w4.p4_pix2foc(dpx4, 1)-dpx4)
pipelinepx4 = self.w4.wcs_pix2world(fpx4, 1)
utils.assert_almost_equal(pipelinepx4, sky4)
def test_outwcs(self):
"""
Test the WCS of the output image
"""
outwcs = dutils.output_wcs([self.w1, self.w4])
#print('outwcs.wcs.crval = {0}'.format(outwcs.wcs.crval))
utils.assert_allclose(
outwcs.wcs.crval, np.array([5.65109952, -72.0674181]), atol=1e-7)
utils.assert_almost_equal(outwcs.wcs.crpix, np.array([2107.0, 2118.5]))
utils.assert_almost_equal(
outwcs.wcs.cd,
np.array([[1.2787045268089949e-05, 5.4215042082174661e-06],
[5.4215042082174661e-06, -1.2787045268089949e-05]]))
assert(outwcs._naxis1 == 4214)
assert(outwcs._naxis2 == 4237)
def test_repeate(self):
# make sure repeated runs of updatewcs do not change the WCS.
updatewcs.updatewcs(self.acs_file)
w1 = HSTWCS(self.acs_file, ext=('SCI', 1))
w4 = HSTWCS(self.acs_file, ext=('SCI', 2))
w1r = HSTWCS(self.ref_file, ext=('SCI', 1))
w4r = HSTWCS(self.ref_file, ext=('SCI', 2))
utils.assert_almost_equal(w1.wcs.crval, w1r.wcs.crval)
utils.assert_almost_equal(w1.wcs.crpix, w1r.wcs.crpix)
utils.assert_almost_equal(w1.wcs.cdelt, w1r.wcs.cdelt)
utils.assert_almost_equal(w1.wcs.cd, w1r.wcs.cd)
assert((np.array(w1.wcs.ctype) == np.array(w1r.wcs.ctype)).all())
utils.assert_almost_equal(w1.sip.a, w1r.sip.a)
utils.assert_almost_equal(w1.sip.b, w1r.sip.b)
utils.assert_almost_equal(w4.wcs.crval, w4r.wcs.crval)
utils.assert_almost_equal(w4.wcs.crpix, w4r.wcs.crpix)
utils.assert_almost_equal(w4.wcs.cdelt, w4r.wcs.cdelt)
utils.assert_almost_equal(w4.wcs.cd, w4r.wcs.cd)
assert((np.array(self.w4.wcs.ctype) == np.array(w4r.wcs.ctype)).all())
utils.assert_almost_equal(w4.sip.a, w4r.sip.a)
utils.assert_almost_equal(w4.sip.b, w4r.sip.b)
def test_remove_npol_distortion():
acs_orig_file = get_filepath('j94f05bgq_flt.fits')
current_dir = os.path.abspath(os.path.curdir)
acs_file = get_filepath('j94f05bgq_flt.fits', current_dir)
idctab = get_filepath('postsm4_idc.fits')
npol_file = get_filepath('qbu16424j_npl.fits')
d2imfile = get_filepath('new_wfc_d2i.fits ')
try:
os.remove(acs_file)
except OSError:
pass
shutil.copyfile(acs_orig_file, acs_file)
fits.setval(acs_file, ext=0, keyword="IDCTAB", value=idctab)
fits.setval(acs_file, ext=0, keyword="NPOLFILE", value=npol_file)
fits.setval(acs_file, ext=0, keyword="D2IMFILE", value=d2imfile)
updatewcs.updatewcs(acs_file)
fits.setval(acs_file, keyword="NPOLFILE", value="N/A")
updatewcs.updatewcs(acs_file)
w1 = HSTWCS(acs_file, ext=("SCI", 1))
w4 = HSTWCS(acs_file, ext=("SCI", 2))
assert w1.cpdis1 is None
assert w4.cpdis2 is None
def test_remove_d2im_distortion():
acs_orig_file = get_filepath('j94f05bgq_flt.fits')
current_dir = os.path.abspath(os.path.curdir)
acs_file = get_filepath('j94f05bgq_flt.fits', current_dir)
idctab = get_filepath('postsm4_idc.fits')
npol_file = get_filepath('qbu16424j_npl.fits')
d2imfile = get_filepath('new_wfc_d2i.fits ')
try:
os.remove(acs_file)
except OSError:
pass
shutil.copyfile(acs_orig_file, acs_file)
fits.setval(acs_file, ext=0, keyword="IDCTAB", value=idctab)
fits.setval(acs_file, ext=0, keyword="NPOLFILE", value=npol_file)
fits.setval(acs_file, ext=0, keyword="D2IMFILE", value=d2imfile)
updatewcs.updatewcs(acs_file)
fits.setval(acs_file, keyword="D2IMFILE", value="N/A")
updatewcs.updatewcs(acs_file)
w1 = HSTWCS(acs_file, ext=("SCI", 1))
w4 = HSTWCS(acs_file, ext=("SCI", 2))
assert w1.det2im1 is None
assert w4.det2im2 is None
def test_missing_idctab():
""" Tests that an IOError is raised if an idctab file is not found on disk."""
acs_orig_file = get_filepath('j94f05bgq_flt.fits')
current_dir = os.path.abspath(os.path.curdir)
acs_file = get_filepath('j94f05bgq_flt.fits', current_dir)
try:
os.remove(acs_file)
except OSError:
pass
shutil.copyfile(acs_orig_file, acs_file)
fits.setval(acs_file, keyword="IDCTAB", value="my_missing_idctab.fits")
with pytest.raises(IOError):
updatewcs.updatewcs(acs_file)
def test_missing_npolfile():
""" Tests that an IOError is raised if an NPOLFILE file is not found on disk."""
acs_orig_file = get_filepath('j94f05bgq_flt.fits')
current_dir = os.path.abspath(os.path.curdir)
acs_file = get_filepath('j94f05bgq_flt.fits', current_dir)
try:
os.remove(acs_file)
except OSError:
pass
shutil.copyfile(acs_orig_file, acs_file)
fits.setval(acs_file, keyword="NPOLFILE", value="missing_npl.fits")
with pytest.raises(IOError):
updatewcs.updatewcs(acs_file)
def test_missing_d2imfile():
""" Tests that an IOError is raised if a D2IMFILE file is not found on disk."""
acs_orig_file = get_filepath('j94f05bgq_flt.fits')
current_dir = os.path.abspath(os.path.curdir)
acs_file = get_filepath('j94f05bgq_flt.fits', current_dir)
try:
os.remove(acs_file)
except OSError:
pass
shutil.copyfile(acs_orig_file, acs_file)
fits.setval(acs_file, keyword="D2IMFILE", value="missing_d2i.fits")
with pytest.raises(IOError):
updatewcs.updatewcs(acs_file)
def test_found_idctab():
""" Tests the return value of apply_corrections.foundIDCTAB()."""
acs_orig_file = get_filepath('j94f05bgq_flt.fits')
current_dir = os.path.abspath(os.path.curdir)
acs_file = get_filepath('j94f05bgq_flt.fits', current_dir)
npol_file = get_filepath('qbu16424j_npl.fits')
d2imfile = get_filepath('new_wfc_d2i.fits ')
try:
os.remove(acs_file)
except OSError:
pass
shutil.copyfile(acs_orig_file, acs_file)
fits.setval(acs_file, ext=0, keyword="NPOLFILE", value=npol_file)
fits.setval(acs_file, ext=0, keyword="D2IMFILE", value=d2imfile)
fits.setval(acs_file, keyword="IDCTAB", value="N/A")
corrections = apply_corrections.setCorrections(acs_file)
assert('MakeWCS' not in corrections)
assert('TDDCor' not in corrections)
assert('CompSIP' not in corrections)
def test_add_radesys():
""" test that RADESYS was successfully added to headers."""
acs_orig_file = get_filepath('j94f05bgq_flt.fits')
current_dir = os.path.abspath(os.path.curdir)
acs_file = get_filepath('j94f05bgq_flt.fits', current_dir)
idctab = get_filepath('postsm4_idc.fits')
npol_file = get_filepath('qbu16424j_npl.fits')
d2imfile = get_filepath('new_wfc_d2i.fits ')
try:
os.remove(acs_file)
except OSError:
pass
shutil.copyfile(acs_orig_file, acs_file)
fits.setval(acs_file, ext=0, keyword="IDCTAB", value=idctab)
fits.setval(acs_file, ext=0, keyword="NPOLFILE", value=npol_file)
fits.setval(acs_file, ext=0, keyword="D2IMFILE", value=d2imfile)
updatewcs.updatewcs(acs_file)
for ext in [('SCI', 1), ('SCI', 2)]:
hdr = fits.getheader(acs_file, ext)
assert hdr['RADESYS'] == 'FK5'
def test_update_d2im_distortion():
acs_orig_file = get_filepath('j94f05bgq_flt.fits')
current_dir = os.path.abspath(os.path.curdir)
acs_file = get_filepath('j94f05bgq_flt.fits', current_dir)
idctab = get_filepath('postsm4_idc.fits')
npol_file = get_filepath('qbu16424j_npl.fits')
d2imfile = get_filepath('new_wfc_d2i.fits')
newd2im = get_filepath('new_wfc_d2i.fits', current_dir)
try:
os.remove(acs_file)
except OSError:
pass
shutil.copyfile(acs_orig_file, acs_file)
fits.setval(acs_file, ext=0, keyword="IDCTAB", value=idctab)
fits.setval(acs_file, ext=0, keyword="NPOLFILE", value=npol_file)
fits.setval(acs_file, ext=0, keyword="D2IMFILE", value=d2imfile)
updatewcs.updatewcs(acs_file)
d2imerr1 = fits.getval(acs_file, ext=1, keyword='D2IMERR1')
d2imerr4 = fits.getval(acs_file, ext=4, keyword='D2IMERR1')
shutil.copyfile(d2imfile, newd2im)
with fits.open(newd2im, mode='update') as newf:
for ext in newf[1:]:
ext.data = ext.data * 100
fits.setval(acs_file, keyword="D2IMFILE", value=newd2im)
updatewcs.updatewcs(acs_file)
nd2imerr1 = fits.getval(acs_file, ext=1, keyword='D2IMERR1')
nd2imerr4 = fits.getval(acs_file, ext=4, keyword='D2IMERR1')
assert np.isclose(d2imerr1 * 100, nd2imerr1)
assert np.isclose(d2imerr4 * 100, nd2imerr4)
def test_apply_d2im():
from stwcs.updatewcs import apply_corrections as appc
acs_orig_file = get_filepath('j94f05bgq_flt.fits')
current_dir = os.path.abspath(os.path.curdir)
fname = get_filepath('j94f05bgq_flt.fits', current_dir)
d2imfile = get_filepath('new_wfc_d2i.fits')
try:
os.remove(fname)
except OSError:
pass
shutil.copyfile(acs_orig_file, fname)
fits.setval(fname, ext=0, keyword="D2IMFILE", value=d2imfile)
fits.setval(fname, ext=0, keyword="IDCTAB", value='N/A')
fits.setval(fname, ext=0, keyword="NPOLFILE", value='N/A')
# If D2IMEXT does not exist, the correction should be applied
assert appc.apply_d2im_correction(fname, d2imcorr=True)
updatewcs.updatewcs(fname)
# Test the case when D2IMFILE == D2IMEXT
assert not appc.apply_d2im_correction(fname, d2imcorr=True)
assert not appc.apply_d2im_correction(fname, d2imcorr=False)
fits.setval(fname, ext=0, keyword='D2IMFILE', value="N/A")
assert not appc.apply_d2im_correction(fname, d2imcorr=True)
# No D2IMFILE keyword in primary header
fits.delval(fname, ext=0, keyword='D2IMFILE')
assert not appc.apply_d2im_correction(fname, d2imcorr=True)
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