[gnuastro-devel] [task #14164] Optional Sky image for MakeCatalog

[Mohammad Akhlaghi]

URL:
  <http://savannah.gnu.org/task/?14164>

                 Summary: Optional Sky image for MakeCatalog
                 Project: GNU Astronomy Utilities
            Submitted by: makhlaghi
            Submitted on: Mon 26 Sep 2016 08:44:28 PM JST
         Should Start On: Mon 26 Sep 2016 12:00:00 AM JST
   Should be Finished on: Mon 26 Sep 2016 12:00:00 AM JST
                Category: MakeCatalog
                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:

For large images, each one of the inputs necessary for MakeCatalog can be very
large. This makes keeping the inputs and later reading them hard.

The Sky image is mostly redundant since it can be subtracted from the input
image. In this case, other than the `--sky' option, or output column, it is
not necessary at all. 

So we can make this image an optional input into MakeCatalog: similar to the
WCLUMPS keyword in the objects image which specifies if there is a clump image
or not. By default make catalog can assume that the input image is sky
subtracted. However, when the WSKY (just a demo name for now) keyword is
present in the input image's header and has a value of 'yes', then it will use
the Sky image. 

This check can be done in `ui.c' and so if the user asks for the Sky column
(with the `--sky' option) and the input is already Sky subtracted, we can warn
the user or abort.

This can also be one step towards task #13759 (to decrease the memory usage of
MakeCatalog).




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