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  1. Data Management
  2. DM-22548

jointcal astrometry fails at initialization with NaN on some DECam data

    Details

    • Type: Bug
    • Status: To Do
    • Resolution: Unresolved
    • Fix Version/s: None
    • Component/s: jointcal
    • Labels:
      None
    • Templates:
    • Story Points:
      4
    • Team:
      Alert Production

      Description

      Shenming Fu reported on Slack about a failure during jointcal's initialization step on some DECAM data, where the initial chi2 is NaN. See discussion on Slack starting here:

      https://lsstc.slack.com/archives/C2K1NGR8E/p1566792586062500

      The data should be at /home/sfu/dm_A2029 on lsst-dev.

      Here's a relevant chunk of the log. I had filed DM-21004 to provide some debug information for this, but it didn't get me anything useful. I suspect I'll have to run it myself and dig around to figure out what's going on.

      jointcal INFO: === Starting astrometric fitting...
      jointcal.ConstrainedAstrometryModel INFO: Got 60 chip mappings and 39 visit mappings; holding chip 28 fixed (1992 total parameters).
      jointcal.AstrometryFit INFO: Reference Color: 0 sig 0 
      jointcal INFO: Initial chi2/ndof : nan/777616=nan
      jointcal WARN: ccdImage 211982_1 has only 96 measuredStars (desired 100)
      jointcal WARN: ccdImage 211982_38 has only 83 measuredStars (desired 100)
      jointcal WARN: ccdImage 213027_35 has only 98 measuredStars (desired 100)
      jointcal WARN: ccdImage 213027_38 has only 81 measuredStars (desired 100)
      jointcal WARN: ccdImage 213031_35 has only 98 measuredStars (desired 100)
      jointcal WARN: ccdImage 433333_28 has only 99 measuredStars (desired 100)
      jointcal WARN: ccdImage 650222_35 has only 96 measuredStars (desired 100)
      jointcal FATAL: Failed processing tract 0, FloatingPointError: Initial chi2 is invalid: chi2/ndof : nan/777616=nan
      

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              • Assignee:
                Parejkoj John Parejko
                Reporter:
                Parejkoj John Parejko
                Watchers:
                John Parejko, John Swinbank
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                • Created:
                  Updated:

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