Posted by
SCO on
Jan 13, 2023; 9:15am
URL: http://astroimagej.170.s1.nabble.com/Best-method-to-define-aperture-radii-tp2085.html
Hi, AstroImageJ has several options on the Multi-Aperture Measurements screen for defining the aperture(s) to be used throughout the set of images (slices). They are:
1) Fixed Apertures as selected above
2) Auto Fixed Apertures from first image T1 radial profile
3) Auto Variable Apertures from multi-image T1 radial profiles
4) Auto Variable Apertures from each image T1 FWHM
My question is, which one of the four options is best for getting the most accurate and precise measurements for all slices and thus the lowest RMS of the residuals in the light curve? I have searched around for some documentation on that question but I was not able to find anything..
My assumption would be that option 3 or 4 would be best because the apertures would then be customized for each particular slice. But if that is a valid assumption then, which option (3 or 4) is best?
Here is the problem: If one of the four options is best, why are the other three even there? As far as I can tell, there are only three possible reasons:
1) The best option to choose depends on the user's environment, goals, equipment, limitations, etc.
2) There is a disagreement or uncertainty among users and/or developers as to which option is best.
3) I completely misunderstand the meaning of these options.
That is what I have been trying to get documentation on. Such documentation does not exist, or at least I can't find it. That is why I opened this post.
Thanks!
Ed
I am not getting much response.. so I will rephrase my question. Has anyone had better luck using one method vs. another?