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  1. Data Management
  2. DM-20775

Modify compareWarp default configs fix clipping stars (when one visit has bad seeing)

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    Details

    • Type: Story
    • Status: Done
    • Resolution: Done
    • Fix Version/s: None
    • Component/s: None
    • Labels:
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      Description

      Tanaka-san found a field in VVDS with bad stellar photometric matching to panstarrs. He found that compareWarp was clipping stars, despite the filter that rescues artifact candidates from the chopping block if they completely overlap a source detected in the PSF-Matched sigma-clipped template.

              self.detect.nSigmaToGrow = 2
              self.detectTemplate.nSigmaToGrow = 2.0
      

      These current defaults assumed that footprints of the detections in the PSF-matched template are larger than those in the warps. Incorrect.

      Fiddling with configs fixed the problem in the VVDS field: dataId=

      {'tract': 10181, 'patch': '2,4', 'filter': 'HSC-G', 'visit': 82508}

      ). I'm currently running a few configuration options through a full RC2 to determine with there are any unexpected side effects and metrics.

      So far changing to detect.nSigmaToGrow = 1 looks promising.

        Attachments

        1. izy_std_fit.pdf
          16 kB
        2. unmatchedDet2.pdf
          18 kB
        3. unmatchedPosDet_083019.pdf
          19 kB
        4. unmatchedPosDet.pdf
          19 kB
        5. w_std_fit_083019.pdf
          18 kB
        6. w_std_fit.pdf
          18 kB
        7. w_std_fit.pdf
          19 kB

          Activity

            People

            Assignee:
            yusra Yusra AlSayyad
            Reporter:
            yusra Yusra AlSayyad
            Reviewers:
            Meredith Rawls
            Watchers:
            Ian Sullivan, Jim Bosch, Meredith Rawls, Michael Wood-Vasey [X] (Inactive), Yusra AlSayyad
            Votes:
            0 Vote for this issue
            Watchers:
            5 Start watching this issue

              Dates

              Created:
              Updated:
              Resolved:

                Jenkins

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