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Re: [bug-gnuastro] failure on wcscat,sh, radec.sh, wcspolygon.sh

From: Mohammad Akhlaghi
Subject: Re: [bug-gnuastro] failure on wcscat,sh, radec.sh, wcspolygon.sh
Date: Fri, 2 Dec 2016 18:32:51 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.0

Hi Christopher,

Thanks again for this final check, I really appreciate it.

Infact my research is also on the high-redshift galaxies, so please don't hesitate to ask any issue that comes up or suggestions that you might have.

In particular for measuring colors, NoiseChisel makes the job very easy, since it doesn't output catalogs, its output is actually object and clump segmentation maps along with image noise statistics as described here:


You then feed this output into another Gnuastro program called `MakeCatalog' to generate a catalog:


The great thing with this modularity is that you can change any of the separate NoiseChisel outputs to other images. For example if you use the same segmentation maps, but different input image (and its statistics), you will get magnitudes of exactly the same objects/clumps in the other color. As another example, if you want aperture photometry, you can ignore NoiseChisel's segmentation maps and make elliptical apertures using MakeProfiles and use those as inputs into MakeCatalog.

I discussed the great advantages of this modularity for creative research in the ADASS, you can see the slides and the short proceedings article in the links below:


I hope that the manual's coverage of the options to all these programs are enough to describe how you can do all of these.

The NoiseChisel program its self is also fully described in this ApJS (220, 1) article:


Thank you very much for your patient help in fixing this issue,

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