Fix Version/s: None
Sprint:DRP F16-2, DRP F16-3, DRP F16-4, DRP F16-6, DRP S17-1
Team:Data Release Production
Perform a quality analysis on the LSST processing of the RC dataset (
DM-6816) in the same way as would be performed before an HSC data release.
- is blocked by
DM-6816 Process HSC "RC" dataset through the LSST stack
- relates to
DM-8533 Investigate "bump" in PSF vs cmodel at bright magnitudes
DM-9383 Investigate propagation of visit flags for certain patches in HSC RC processing
DM-9535 Assess whether differences in Brighter-Fatter implementations are contributing to the trace radii differences: LSST vs. HSC
DM-8532 Investigate misclassification of objects as galaxies vs HSC
- Won't Fix
There's some analysis of these results on
DM-6817, but I'm not sure if there's any further commentary to come on this story. Lauren MacArthur, can you provide a brief summary of the results, please?
The recently created tickets
DM-8532 & DM-8533 capture the most pressing issues, as revealed by this ticket and DM-6817, to get to the bottom of. From discussions in the regular Monday morning meeting here at Princeton, I will be focussing first on a look at the brightest stars being used in the psf modeling looking in particular at their footprints and distribution of peaks (as a function of distance from the centroid).
For direct comparison of the plot that revealed the main issues (see comments in
DM-6817), I have also attached the HSC version. So, compare:
The "bump" at bright magnitudes is not present in the latter and the large density of objects that have likely been misclassified as galaxies (namely the strip of red objects just below the threshold for the star/galaxy classification) in the LSST stack plot has much lower density in the HSC plot.
The attached txt files provide side-by-side statistics for the LSST and HSC RC dataset runs for various internal comparisons (direct comparisons of matched source between the two runs will be presented in
DM-6817). The *_sum.txt show the per visit/tract results, whereas the *_shortSum.txt show just the averages over the visit/tract entries.
hscVisitAnalysis => single frame measurement results
hscCoaddAnalysis => coadd measurement results
hscColorAnalysis => stellar locus on coadds
All of the diagnostics shown have accompanying figures. Several example plots are also attached (these are all from the LSST runs. The associated HSC run figures have also been generated.)
DM-6816for a summary of the astrometric and photometric metric comparisons (after running meas_mosaic).