[gnuastro-devel] [task #14169] ImageCrop on any WCS coordinate orientation

[Mohammad Akhlaghi]

URL:
  <http://savannah.gnu.org/task/?14169>

                 Summary: ImageCrop on any WCS coordinate orientation
                 Project: GNU Astronomy Utilities
            Submitted by: makhlaghi
            Submitted on: Mon 03 Oct 2016 08:48:59 PM JST
         Should Start On: Mon 03 Oct 2016 12:00:00 AM JST
   Should be Finished on: Mon 03 Oct 2016 12:00:00 AM JST
                Category: ImageCrop
                Priority: 5 - Normal
              Item Group: Enhancement
                  Status: Postponed
                 Privacy: Public
        Percent Complete: 0%
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                  Effort: 0.00

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Details:

Currently in WCS mode, ImageCrop only works when the celestial coordinates are
aligned with the image coordinates: declination along the vertical axis and
right ascention opposite to the horizontal axes. This is the standard
alignment for processed survey images, but very inconvenient when using single
exposure images that are not yet aligned. 

So we have to remove the WCS mode's assumptions regarding the orientation of
the WCS axeses to fix this problem. When there are multiple images to stitch
from, we have to simply make sure that the axises align with each other, not
with the image axises.




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