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FIX: Bring WCS commits from DRAGONS #74

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Dec 18, 2024
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FIX: Bring WCS commits from DRAGONS #74

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11 changes: 10 additions & 1 deletion astrodata/wcs.py
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Original file line number Diff line number Diff line change
Expand Up @@ -690,8 +690,17 @@ def read_wcs_from_header(header):
crval = []
cdelt = []

# Handle more than 1 undefined (i.e., not CTYPEi) axis
untyped_axes = 0
for i in range(1, wcsaxes + 1):
ctype.append(header.get(f"CTYPE{i}", "LINEAR"))
try:
this_ctype = header[f"CTYPE{i}"]

except KeyError:
this_ctype = f"LINEAR{untyped_axes+1 if untyped_axes else ''}"
untyped_axes += 1

ctype.append(this_ctype)
cunit.append(header.get(f"CUNIT{i}", None))
crpix.append(header.get(f"CRPIX{i}", 0.0))
crval.append(header.get(f"CRVAL{i}", 0.0))
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