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[task #15128] TPV and SIP keywords when WCS distortions are necessary


From: Sachin Kumar Singh
Subject: [task #15128] TPV and SIP keywords when WCS distortions are necessary
Date: Thu, 11 Jun 2020 07:34:41 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:76.0) Gecko/20100101 Firefox/76.0

Follow-up Comment #33, task #15128 (project gnuastro):

The new library `wcsdistortion` is tested and pushed on github
<https://github.com/sachinkumarsingh092/gnuastro/tree/task-sip-tpv> and gitlab
<https://gitlab.com/sachinkumarsingh092/gnuastro-dev/-/tree/task-sip-tpv>. 

Two high-level functions `gal_wcs_distortion_identify` and
`gal_wcs_distortion_convert` are added in *wcs.c*. Final testing is to be done
before rebasing and merging it to master branch.

About the interface, I think as the library only has basic functionalities as
of now, a common option interface is more apt for it for now. A full-fledged
program can be written once the library is mature enough to support more
functionalities:-). Any thoughts? 



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