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  1. Data Management
  2. DM-18630

Investigate jointcal astrometry models with Run2.1i data

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    • Type: Story
    • Status: Done
    • Resolution: Done
    • Fix Version/s: None
    • Component/s: None
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    • Story Points:
      8
    • Epic Link:
    • Sprint:
      DRP S19-4, DRP S19-5
    • Team:
      Data Release Production

      Description

      DESC reported that running jointcal on Run2.1i made the astrometry repeatability worse than processCcd.  This is not surprising because:

      1) The reference catalogs are near perfect and to full depth < 23.  They essentially are the input catalogs, and therefor  jointcal's benefit of bootstrapping deeper is not realized. 

      2) ProcessCcd fits a 3rd order polynomial per-ccd. Jointcal is fitting a model that is 1st order per ccd and 7th order per focal plane. The jointcal model is more robust, but doesn't have as many degrees of freedom as the processCcd model. 

      James Chiang copied over a tract to lsst-dev for us to play with. Thanks to Hsin-Fang Chiang for ingesting it and running it through singleFrame processing. On this ticket, I'll post the results of:

      1) Running validateDrp and visitAnalysis on 4 different config repos:

      2) Reconciling metrics posted in validateDrp and visitAnalysis from the ones computed in Jim's notebook

      3) Rerunning single frame using only bright stars from the reference catalog. 

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              • Assignee:
                yusra Yusra AlSayyad
                Reporter:
                yusra Yusra AlSayyad
                Watchers:
                Eli Rykoff, James Chiang, John Parejko, Yusra AlSayyad
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