taskGNU Astronomy Utilities - Tasks: task #14116, MakeProfiles option to set...

 
 

You are not allowed to post comments on this tracker with your current authentication level.

task #14116: MakeProfiles option to set non-masked pixels in background image to zero

Submitted by:  Mohammad Akhlaghi <makhlaghi>
Submitted on:  Thu 11 Aug 2016 09:55:39 PM UTC  
 
Should Start On: Thu 11 Aug 2016 03:00:00 PM UTCShould be Finished on: Thu 11 Aug 2016 03:00:00 PM UTC
Category: MakeProfilesPriority: 5 - Normal
Item Group: EnhancementStatus: Done
Privacy: PublicPercent Complete: 100%
Assigned to: Mohammad Akhlaghi <makhlaghi>Open/Closed: Closed
Effort: 0.00

Sat 13 Aug 2016 12:56:12 AM UTC, comment #1:

The input image can now be used as a canvas to build mock profiles, please see the commit message for more details.

Mohammad Akhlaghi <makhlaghi>
Project AdministratorIn charge of this item.
Thu 11 Aug 2016 09:55:39 PM UTC, original submission:

The motivation for this task is related to task #14115 and the aperture photometry process explained there. As explained there, for aperture photometry (when you already have the positions and elliptical properties of objects you want to do photometry on) with Gnuastro, you will need to take the following steps:

  • Run NoiseChisel on the data image (to get an estimate of the Sky and its standard deviation).
  • Use MakeProfiles to generate elliptical/circular apertures with given ID values on the positions you want.
  • Use MakeCatalog on NoiseChisel's output, but replace the object HDU with the image you created with MakeProfiles.

In order to be sure you do the aperture photometry accurately it is very important that all the header information (including the image size, WCS and everything else) of NoiseChisel and MakeCatalog's outputs match exactly. This can be done currently with MakeProfiles, but you have to set them all by hand and make sure you set the image size properties correctly. Making sure of all these issues can be very bothering.

So with this task, we will add an option to MakeProfiles which essentially sets all the non-NaN (or non-masked) pixels of the background image (the optional FITS argument to MakeProfiles) to zero. In this way the default addition process will finally result in the object IDs. This feature can be used for other cases too. For example building mock profiles over the same region of sky as a real image.

Mohammad Akhlaghi <makhlaghi>
Project AdministratorIn charge of this item.

 

No files currently attached

 

Depends on the following items: None found

Items that depend on this one: None found

 

Carbon-Copy List
  • -unavailable- added by makhlaghi (Submitted the item)
  •  

    Do you think this task is very important?
    If so, you can click here to add your encouragement to it.
    This task has 0 encouragements so far.

    Only logged-in users can vote.

     

    Please enter the title of George Orwell's famous dystopian book (it's a date):

     

     

    Follow 3 latest changes.

    Date Changed By Updated Field Previous Value => Replaced By
    Sat 13 Aug 2016 12:56:12 AM UTCmakhlaghiStatusIn Progress=>Done
      Percent Complete0%=>100%
      Open/ClosedOpen=>Closed

    Back to the top


    Powered by Savane 3.1-cleanup1