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[gnuastro-devel] [bug #55217] --align not working as expected in left-ha

From: Mohammad Akhlaghi
Subject: [gnuastro-devel] [bug #55217] --align not working as expected in left-hand oriented WCS
Date: Wed, 12 Dec 2018 20:53:00 -0500 (EST)
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:64.0) Gecko/20100101 Firefox/64.0


                 Summary: --align not working as expected in left-hand
oriented WCS
                 Project: GNU Astronomy Utilities
            Submitted by: makhlaghi
            Submitted on: Thu 13 Dec 2018 01:52:58 AM UTC
                Category: Warp
                Severity: 3 - Normal
              Item Group: Output not reasonable
                  Status: Postponed
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any



When the input WCS dataset is left-hand oriented (East is to the left of
North, what ever direction North has), then the `--align' operator doesn't
work as expected. 

This problem can be reproduced with a simple mock image:

$ echo "0 25 25 1 2 1 45 0.5 1 5"                    \
       | astmkprof --oversample=1 --mergedsize=49,49 \
$ astwarp in.fits --flip=0,1 --rotate=20
$ astwarp in_warped.fits --align

The output `in_warped_aligned.fits' will not be aligned with the standard
RA/Dec directions (North to the top and East to the left). 

However, apparently no information is lost, because after opening `in.fits'
and `in_warped_aligned.fits' in ds9 and matching them by their WCS, things
seem reasonable. So --align is apparently just failing in finding the wrong
rotation, it doesn't look like a lower-level problem (in mixing pixels for


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