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
Try running jointcal with the defaults: that will use the constrained model for both astrometry and photometry, with a 5th and 7th order polynomial, respectively. What version are you running?
The "simple" models are just extensions of the processCcd model (one model per ccd/visit: 2d polynomial for astrometry, one calibration factor for photometry). They are primarily useful for debugging or fitting non-mosaic camera data.