Details
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Type:
Bug
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Status: To Do
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Resolution: Unresolved
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Fix Version/s: None
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Component/s: psfex
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Labels:
Description
When the number of stars picked by the star selector is small, psfex fails, giving the following traceback:
processCcd.charImage.measurePsf INFO: PSF star selector found 2 candidates
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processCcd.charImage.measurePsf.psfDeterminer WARN: NOT scaling kernelSize by stellar quadrupole moment, but using absolute value
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> WARNING: 1st context group removed (not enough samples)
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processCcd.charImage.measurePsf INFO: PSF determination using 1/2 stars.
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processCcd FATAL: Failed on dataId=DataId(initialdata={'visit': 242629702}, tag=set([])):
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File "src/PsfexPsf.cc", line 216, in virtual std::shared_ptr<lsst::afw::image::Image<double> > lsst::meas::extensions::psfex::PsfexPsf::_doComputeImage(const Point2D&, const lsst::afw::image::Color&, const Point2D&) const
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Only spatial variation (ndim == 2) is supported; saw 0 {0}
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lsst::pex::exceptions::InvalidParameterError: 'Only spatial variation (ndim == 2) is supported; saw 0'
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Traceback (most recent call last):
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File "/ssd/lsstsw/stack_20170409/Linux64/pipe_base/13.0-3-g7fa07e0+5/python/lsst/pipe/base/cmdLineTask.py", line 347, in __call__
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result = task.run(dataRef, **kwargs)
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File "/ssd/lsstsw/stack_20170409/Linux64/pipe_base/13.0-3-g7fa07e0+5/python/lsst/pipe/base/timer.py", line 121, in wrapper
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res = func(self, *args, **keyArgs)
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File "/home/mfl/lsst/pipe_tasks/python/lsst/pipe/tasks/processCcd.py", line 188, in run
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doUnpersist=False,
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File "/ssd/lsstsw/stack_20170409/Linux64/pipe_base/13.0-3-g7fa07e0+5/python/lsst/pipe/base/timer.py", line 121, in wrapper
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res = func(self, *args, **keyArgs)
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File "/home/mfl/lsst/pipe_tasks/python/lsst/pipe/tasks/characterizeImage.py", line 351, in run
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background = background,
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File "/ssd/lsstsw/stack_20170409/Linux64/pipe_base/13.0-3-g7fa07e0+5/python/lsst/pipe/base/timer.py", line 121, in wrapper
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res = func(self, *args, **keyArgs)
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File "/home/mfl/lsst/pipe_tasks/python/lsst/pipe/tasks/characterizeImage.py", line 413, in characterize
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psfSigma = psf.computeShape().getDeterminantRadius()
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InvalidParameterError:
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File "src/PsfexPsf.cc", line 216, in virtual std::shared_ptr<lsst::afw::image::Image<double> > lsst::meas::extensions::psfex::PsfexPsf::_doComputeImage(const Point2D&, const lsst::afw::image::Color&, const Point2D&) const
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Only spatial variation (ndim == 2) is supported; saw 0 {0}
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lsst::pex::exceptions::InvalidParameterError: 'Only spatial variation (ndim == 2) is supported; saw 0'
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This should fail sufficiently gracefully, so that the rest of the processing can proceed using the nominal/placeholder PSF.
It should be noted that when things fail, we should know they fail without parsing the logs, i.e. a field status-bit should be set to say this happened, and that subsequent processing was done using an unfitted PSF.
Also note that trying to improve this by setting config.charImage.measurePsf.psfDeterminer["psfex"].spatialOrder=0 makes for an even less graceful failure, i.e. a segfault, as per DM-10577 