taskGNU Astronomy Utilities - Tasks: task #15786, Column to calculate half the total...

 
 

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task #15786: Column to calculate half the total area

Submitter:  Mohammad Akhlaghi <makhlaghi>
Submitted:  Tue 06 Oct 2020 04:21:15 PM UTC
   
 
Should Start On:  Mon 05 Oct 2020 11:00:00 PM UTC Should be Finished on:  Mon 05 Oct 2020 11:00:00 PM UTC
Category:  MakeCatalog Priority:  5 - Normal
Item Group:  Enhancement Status:  Done
Privacy:  Public Assigned to:  makhlaghi
Percent Complete:  100% Open/Closed:  Closed
Effort:  0.00

Tue 06 Oct 2020 05:45:49 PM UTC, comment #1: 

This task has been implemented in Commit 3c3dc91428.

In short the new '--areahalfsum' option will measure this area and add the corresponding column to the output catalog of MakeCatalog.

For more on this option, see its description at the bottom of page 316 in documentation (currently only in PDF format):

http://akhlaghi.org/gnuastro.pdf

As always the most recent version of Gnuastro (which includes this new option now) here:

https://akhlaghi.org/gnuastro-latest.tar.lz

Mohammad Akhlaghi <makhlaghi>
Group administrator
Tue 06 Oct 2020 04:21:15 PM UTC, original submission:  

One useful measure for the morphology of an object is the area that contains half of the total flux over a label. For example we can use the square root of this area as an approximation of its effective radius. So it would be useful to have such a column.

In practice, because this will involve sorting a label's pixels, we do already have the main components: in the same function that we calculate the object's median.

Mohammad Akhlaghi <makhlaghi>
Group administrator

 

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    Date Changed by Updated Field Previous Value => Replaced by
    2020-10-06 makhlaghi StatusNone Done
        Percent Complete0% 100%
        Assigned toNone makhlaghi
        Open/ClosedOpen Closed
    2020-10-06 makhlaghi Carbon-Copy- Added -email is unavailable-

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