Details
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Type:
Bug
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Status: Won't Fix
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Resolution: Done
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Fix Version/s: None
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Component/s: jointcal
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Labels:None
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Epic Link:
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Team:Alert Production
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`
Attachments
Issue Links
- relates to
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DM-13053 allow refcat selection improve fitting
- Done
Activity
Dominique Boutigny
created issue -
Dominique Boutigny
made changes -
| Field | Original Value | New Value |
|---|---|---|
| Risk Score | 0 |
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` |
| 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 |
| Epic Link |
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| Team | Alert Production [ 10300 ] |
James Chiang
made changes -
| Attachment | run2.1i_jointcal_delta_mags_w_2019_09.png [ 37228 ] |
| Resolution | Done [ 10000 ] | |
| Status | To Do [ 10001 ] | Won't Fix [ 10405 ] |