Details
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Type:
Story
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Status: Done
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Resolution: Done
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Fix Version/s: None
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Component/s: Science Pipelines
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Labels:
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Templates:customfield_11800 242580
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Story Points:4
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Epic Link:
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Sprint:AP S19-5
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Team:Alert Production
Description
Some CCDs in the HSC-RC2 reprocessing show this warning:
processCcd.calibrate.astrometry.matcher WARN: Number of matches is smaller than request
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This probably should be an error on the matcher, but it seems to be passed to the fitter and then report as a successful fit.
A few data IDs of interest are visit=1872 ccd=11 visit=1868 ccd=13 visit=22648 ccd=4.
The first CCD
processCcd.calibrate.astromRefObjLoader INFO: Loaded 1580 reference objects
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processCcd.calibrate.astrometry.matcher INFO: Purged 661 sources, leaving 113 good sources
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processCcd.calibrate.astrometry.matcher INFO: Matched 25 sources
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processCcd.calibrate.astrometry.matcher WARN: Number of matches is smaller than request
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processCcd.calibrate.astrometry.matcher INFO: Purged 661 sources, leaving 113 good sources
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processCcd.calibrate.astrometry.matcher INFO: Matched 1 sources
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processCcd.calibrate.astrometry.matcher WARN: Number of matches is smaller than request
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processCcd.calibrate.astrometry INFO: Fit WCS iter 2 failed; using previous iteration:
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File "src/sip/CreateWcsWithSip.cc", line 131, in lsst::meas::astrom::sip::CreateWcsWithSip<MatchT>::CreateWcsWithSip(const std::vector<T>&, const lsst::afw::geom::SkyWcs&, int, const lsst::geom::Box2I&, int) [with MatchT = lsst::afw::table::Match<lsst::afw::table::SimpleRecord, lsst::afw::table::SourceRecord>]
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Number of matches less than requested sip order {0}
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lsst::pex::exceptions::LengthError: 'Number of matches less than requested sip order'
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processCcd.calibrate.astrometry INFO: Matched and fit WCS in 1 iterations; found 25 matches with scatter = 0.028 +- 0.019 arcsec
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The second
processCcd.calibrate.astromRefObjLoader INFO: Loaded 1840 reference objects
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processCcd.calibrate.astrometry.matcher INFO: Purged 595 sources, leaving 133 good sources
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processCcd.calibrate.astrometry.matcher INFO: Matched 27 sources
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processCcd.calibrate.astrometry.matcher WARN: Number of matches is smaller than request
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processCcd.calibrate.astrometry.matcher INFO: Purged 595 sources, leaving 133 good sources
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processCcd.calibrate.astrometry.matcher INFO: Matched 4 sources
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processCcd.calibrate.astrometry.matcher WARN: Number of matches is smaller than request
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processCcd.calibrate.astrometry INFO: Fit WCS iter 2 failed; using previous iteration: All matches rejected in iteration 1
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processCcd.calibrate.astrometry INFO: Matched and fit WCS in 1 iterations; found 27 matches with scatter = 0.092 +- 0.049 arcsec
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And the third
processCcd.calibrate.astromRefObjLoader INFO: Loaded 1441 reference objects
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processCcd.calibrate.astrometry.matcher INFO: Purged 1109 sources, leaving 99 good sources
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processCcd.calibrate.astrometry.matcher INFO: Matched 47 sources
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processCcd.calibrate.astrometry.matcher INFO: Purged 1109 sources, leaving 99 good sources
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processCcd.calibrate.astrometry.matcher INFO: Matched 49 sources
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processCcd.calibrate.astrometry.matcher INFO: Purged 1109 sources, leaving 99 good sources
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processCcd.calibrate.astrometry.matcher INFO: Matched 27 sources
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processCcd.calibrate.astrometry.matcher WARN: Number of matches is smaller than request
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processCcd.calibrate.astrometry INFO: Matched and fit WCS in 3 iterations; found 27 matches with scatter = 0.029 +- 0.020 arcsec
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The logs are from using the w_2019_10 stack. But the LengthError has appeared since w_2019_07, and the Number of matches is smaller than request warnings have been around for longer.
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