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  1. Data Management
  2. DM-16226

jointcal constrained photometry model is not better than processCcd photometry on DC2 run1.2

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    • Bug
    • Status: Won't Fix
    • Resolution: Done
    • None
    • jointcal
    • None

    Description

      From a set of 7 visits from DESC DC2 Run1.2p I am taking 1 visit as an arbitrary reference and for each matched sources in the other visits I compute the difference of magnitude using 1- the `processCcd` calibration and 2- the `jointcal` calibration from the default constrained model.

      The dispersion (19.9 mmag) is identical in both cases which looks very surprising. The size of the dispersion also looks very large. 

      In order to reproduce the problem the data are available on `lsst-dev:/home/boutigny/2018-10-11` and the notebook to reproduce the plot is on: `https://github.com/boutigny/LSST_notebooks/blob/master/DC2/multi_visit_Joincal.ipynb`

      I am not excluding an error on my side or a misusage of `jointcal`

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              Unassigned Unassigned
              boutigny Dominique Boutigny
              Dominique Boutigny, Eli Rykoff, James Chiang, Jim Bosch, John Parejko, John Swinbank, Robert Lupton
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                Resolved:

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