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DM-50108: Add maxPsfFwhm to per-detector selector #1203

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Dec 4, 2025
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DM-50108: Add maxPsfFwhm to per-detector selector #1203

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16 changes: 16 additions & 0 deletions python/lsst/pipe/tasks/selectImages.py
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Original file line number Diff line number Diff line change
Expand Up @@ -291,6 +291,14 @@ class PsfWcsSelectImagesConnections(pipeBase.PipelineTaskConnections,

class PsfWcsSelectImagesConfig(pipeBase.PipelineTaskConfig,
pipelineConnections=PsfWcsSelectImagesConnections):
maxPsfFwhm = pexConfig.Field(
doc="Maximum PSF FWHM (in arcseconds) to select. This can be used in conjunction with the "
"per-visit maxPsfFwhm in BestSeeingSelectVisitsTask to ensure that no outlier CCD has a "
"PSF FWHM larger than this value.",
dtype=float,
default=1.8,
optional=True,
)
maxEllipResidual = pexConfig.Field(
doc="Maximum median ellipticity residual",
dtype=float,
Expand Down Expand Up @@ -501,6 +509,14 @@ def isValid(self, visitSummary, detectorId):
row["visit"], detectorId, nPsfStar, minNPsfStar
)
valid = False
elif self.config.maxPsfFwhm:
pixelScale = row['pixelScale']
psfSigma = row['psfSigma']
fwhm = psfSigma * pixelScale * np.sqrt(8.*np.log(2.))
if not (fwhm <= self.config.maxPsfFwhm):
self.log.info("Removing visit %d detector %d because FWHM too large: %f vs %f",
row["visit"], detectorId, fwhm, self.config.maxPsfFwhm)
valid = False

return valid

Expand Down