For those who want to work on the astrometry project and are having a problem locating the repository where the work is done previously, I'm putting it here for ease: https://gitlab.com/sachinkumarsingh092/gnuastro-matching-fits-nohealpix/-/tree/mohammad.

`match.c` is the main program where the work is done. Go through it to get a high-level understanding of its working. To test locally, use `make compile` (see the Makefile). The `rough-outline.txt` is a brief roadmap for the project.

I have gone through the entire tutorial by trying all that was mentioned and have got an overview of all the functionalities. Also looking at the mandatory source code and Developing portions of the manual I have a very high-level idea of the file structure and the functionality.
I'm interested in working on the 'astrometry library in gnuastro' project among the two suggested.
However I still not got a hang of the codebase and all low-level details
Since only a week is left now for the proposal submission for GSoC, would you suggest me to move ahead with it or am I not ready for it this year?
If Yes then how should be the ideal plan of action up to 13 April ?

Hello,
I am not able to access the tar file on this site https://www.gnu.org/software/gnuastro/manual/html_node/WCSLIB.html

I tried using both Wget/cURL (from the command-line), and using a browser. With the browser the save link option doesn't work so I copied the download link and tried it using command line.

The error message is :
Wget ftp://ftp.atnf.csiro.au/pub/software/wcslib/wcslib.tar.bz2                                                       --2021-03-20 08:15:01--  ftp://ftp.atnf.csiro.au/pub/software/wcslib/wcslib.tar.bz2
           => ‘wcslib.tar.bz2’
Resolving ftp.atnf.csiro.au (ftp.atnf.csiro.au)... 150.229.106.20
Connecting to ftp.atnf.csiro.au (ftp.atnf.csiro.au)|150.229.106.20|:21... failed: Connection timed out.

Hi Amey,

I downloaded and checked the WCSLIB from the link and it seems to be working fine on my side. Can you please explain your problem in more detail or show the error message you're getting? Maybe try to check if there is a permission issue with the tar file (though it's not likely).

Also, check this page has solution to you query: https://www.gnu.org/software/gnuastro/manual/html_node/Known-issues.html#Known-issues

RECOMMENDED STEPS TO START DEVELOPING IN GNUASTRO

This is for those interested in participating in Gnuastro's development focused on GSoC 2021. It is based on teh successful completion GSoC 2020 and its related discussions in sr #110195. The basic point is that you should first install and run the programs to get a feeling of their over-all purpose and usage, then start getting your hands dirty into the coding. The following list should be a rough guide on how to do this.

1. Install the dependencies. In particular, if you use the most common GNU/Linux operating systems, to start with, we recommend using your package manager. Later, when you get more advanced, you can install them from source also.
2. Install the latest Gnuastro from the officially released tarball and install it as described in the Quick start.
3. There is a full chapter of tutorials, if you have time go through all of them, if not, the general tutorial should be enough. It is a little long, but shouldn't take more than three or four hours. You don't necessarily have to understand the full depth of the science behind the steps. Try to open the images (inputs and outputs) and things should be clear. This tutorial touches upon most Gnuastro programs will give you a very good feeling of it (and thus help you develop good ideas to write in the GSoC proposal.
4. Having done the tutorial, you may have your own ideas on what to improve, or you can have a look at the list of bugs or tasks. Some more easier tasks are task #15317, task #15138, task #15136, task #15109, task #15053, task #14986, task #14908, task #14760, task #14643, task #14419, task #14409, task #14364. If they aren't already taken, you can post a comment on the task and start focusing on it.
5. You are now ready to start developing. But you will need the version controlled source, which needs to be bootstrapped. And bootstrapping has its own dependencies. So install the bootstrapping dependencies, then follow the bootstrapping guide to prepare the raw source for building/developing. After bootstrapping, you can configure and install Gnuastro's version controlled source just like the tarball.
6. Depending on the task/bug that you have selected to work on, please read the description of that particular program. For example if the bug/task is related to the Crop program, read the Crop section of the manual. This will give you an over-all feeling of the overall working style of the program and help guide you mentally when you are reading the source.
7. Read the Developing chapter of the Gnuastro manual. Please read this section carefully because it will really help you get a smooth start on the source code and our style. In particular the Program source section describes the common structure of files and programming structure of the programs. Don't forget to read the other sections of this chapter too ;-)!
8. Build you own fork of Gnuastro (as described in the Forking tutorial.
9. If you are fixing a bug, please try to reproduce it.
10. Go into the source of the program you want to work on, and start reading the code from `main.c' (which has the starting `main()' function). Follow the functions and comments until the end of the program (beware that some programs can be large and complex, you can usually tell this by the number of files in its source directory).
11. Once you have a nice mental image of the program, you are ready to start working on your selected bug/task.
12. Please don't hesitate to ask any GSoC (general) question here, but if your discussion is about a certain task/bug, please don't post it here, use the bug/task's own page.