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  1. Data Management
  2. DM-6562

DoubleShapeletApproximation fails to fit Gaussian PSF

    Details

    • Type: Story
    • Status: Done
    • Resolution: Done
    • Fix Version/s: None
    • Component/s: meas_modelfit
    • Labels:
      None
    • Templates:
    • Story Points:
      4
    • Epic Link:
    • Sprint:
      DRP F16-6
    • Team:
      Data Release Production

      Description

      When iterating a psf in a single frame processing for ci_hsc data-product visit 903338 ccd 18, the psf determiner generates a PSF for which a shapelet approximation cannot be found. Specifically, when the PSF determination stage iterates, it converts the determined PSF from the previous step into a Gaussian with an equivalent width. The double shapelet approximation fails to fit this Gaussian.

      This ticket should make the PSF fitting robust against cases like this. Additionally it should revert the changes in ci_hsc on the DM-4202 ticket branch which were put in as a temporary workaround for this problem.

      Attached to this ticket is the PSF that is failing, and a script which can reproduce the problem.

        Attachments

        1. badpsf2
          17 kB
          Nate Lust
        2. shapeFitFail.py
          0.7 kB
          Nate Lust

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              • Assignee:
                jmeyers314 Joshua Meyers
                Reporter:
                nlust Nate Lust
                Watchers:
                Bob Armstrong, Joshua Meyers, Nate Lust
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                3 Start watching this issue

                Dates

                • Created:
                  Updated:
                  Resolved:

                  Summary Panel