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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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    Details

    • Type: Bug
    • Status: Won't Fix
    • Resolution: Done
    • Fix Version/s: None
    • Component/s: jointcal
    • Labels:
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      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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            boutigny Dominique Boutigny created issue -
            boutigny Dominique Boutigny made changes -
            Field Original Value New Value
            Risk Score 0
            boutigny Dominique Boutigny made changes -
            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.  

            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`
            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`
            Parejkoj John Parejko made changes -
            Summary jointcal constrained photometry model is not better than processCcd photometry jointcal constrained photometry model is not better than processCcd photometry on DC2 run1.2
            swinbank John Swinbank made changes -
            Epic Link DM-14447 [ 80385 ]
            swinbank John Swinbank made changes -
            Team Alert Production [ 10300 ]
            Parejkoj John Parejko made changes -
            Link This issue relates to DM-13053 [ DM-13053 ]
            swinbank John Swinbank made changes -
            Epic Link DM-14447 [ 80385 ] DM-16722 [ 235355 ]
            swinbank John Swinbank made changes -
            Epic Link DM-16722 [ 235355 ] DM-17887 [ 240317 ]
            jchiang James Chiang made changes -
            swinbank John Swinbank made changes -
            Epic Link DM-17887 [ 240317 ] DM-19979 [ 307530 ]
            swinbank John Swinbank made changes -
            Epic Link DM-19979 [ 307530 ] DM-21441 [ 423048 ]
            swinbank John Swinbank made changes -
            Epic Link DM-21441 [ 423048 ] DM-22484 [ 427311 ]
            swinbank John Swinbank made changes -
            Epic Link DM-22484 [ 427311 ] DM-24339 [ 433026 ]
            swinbank John Swinbank made changes -
            Resolution Done [ 10000 ]
            Status To Do [ 10001 ] Won't Fix [ 10405 ]

              People

              Assignee:
              Unassigned Unassigned
              Reporter:
              boutigny Dominique Boutigny
              Watchers:
              Dominique Boutigny, Eli Rykoff, James Chiang, Jim Bosch, John Parejko, John Swinbank, Robert Lupton
              Votes:
              0 Vote for this issue
              Watchers:
              7 Start watching this issue

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                Created:
                Updated:
                Resolved:

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