[sr #110649] Clumps with S/N smaller than threshold consider as a true clumps

[Mohammad Akhlaghi]

Update of sr #110649 (project gnuastro):

                  Status:                    None => In Progress            
             Assigned to:                    None => makhlaghi              

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Follow-up Comment #1:

Thanks a lot for reporting this Sepideh!

Just for completeness, when you say "flat(3*3)", do you mean that 'flat.txt'
is simply a plain-text file with 9 values of '1' like below?


$ cat flat.txt
1  1  1
1  1  1
1  1  1


Now to my question: when I ran the same series of commands, and visually
inspected 'seg.fits', I couldn't visually find any bad clumps. In the P.S. you
can see the output of my Segment command. Do you also find 2811 objects and
clumps? If so, when you run with '--checksegmentation' and '--checksn', can
you tell me which clump has an S/N below 1.3337?

By the way, when you put multi-line commands (like the 'astcrop' and 'wget'
commands of your first post), don't forget to put the back-slask (\) at the
end of the line, otherwise, its hard to copy-paste the commands ;-).

P.S.


$ astsegment nc.fits --kernel=kernel.fits --snquant=0.99 --gthresh=1000
--grownclumps --output=seg.fits
Segment 0.17.30-e5c4 started on Mon May 16 02:00:10 2022
  - Using 12 CPU threads.
  - Input: nc.fits (hdu: 1)
  - Sky STD: nc.fits (hdu: SKY_STD)
  - Kernel: kernel.fits (hdu: 1)
  - Detection: nc.fits (hdu: DETECTIONS)
  - Convolved with given kernel.                       0.150609 seconds
  - Input number of connected components: 218
  - Finding true clumps...
  ---- Clump peak S/N: 1.3337 (0.990 quant of 4339).   0.022486 seconds
  - 2811 objects containing 2811 clumps found.         1.656154 seconds
  - Output written to 'seg.fits'.
Segment finished in:  2.340592 seconds



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