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Fixes issue #35 - FITS CUNIT 'M/S' header. #36

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merged 4 commits into from
May 25, 2022
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Fixes issue #35 - FITS CUNIT 'M/S' header. #36

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40952e7
Fixes issue #35 - FITS CUNIT 'M/S' header.
razman786 May 10, 2022
a59c1cb
Requires Python >=3.6
razman786 May 23, 2022
6ae8aac
Deprecate Python 2.7 testing
bennahugo May 23, 2022
fa6b2e9
Deprecate python 2.7 build
bennahugo May 23, 2022
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24 changes: 21 additions & 3 deletions Tigger/Coordinates.py
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,8 @@
# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
from __future__ import print_function, division, absolute_import

from astropy.wcs.wcs import InvalidTransformError
import Tigger
from Tigger import startup_dprint

Expand Down Expand Up @@ -348,12 +350,28 @@ def __init__(self, header):
# pix2world then fails expecting N x 4. Using astropy wcs methods and not sub-classing FITSWCSpix
# avoids the error and a reliance on naxis.

# get astropy WCS
self.wcs = WCS(header)

# get number of axis
naxis = header['NAXIS']

# get astropy WCS
try:
self.wcs = WCS(header)
except InvalidTransformError as e:
if 'CUNIT' in str(e):
# check header for incorrect CUNIT entry 'M/S'
for iaxis in range(naxis):
name = header.get("CUNIT%d" % (iaxis + 1), '').upper()
if name.startswith("M/S"):
# correct the header
header.set("CUNIT%d" % (iaxis + 1), 'm/s')
# re-load WCS
try:
self.wcs = WCS(header)
except InvalidTransformError as e:
raise RuntimeError(f"Error WCS header {e}")
else:
raise RuntimeError(f"Error WCS header {e}")

# get ra and dec axis
self.ra_axis = self.dec_axis = None
for iaxis in range(naxis):
Expand Down