Merge pull request #157 from lsst/u/jchiang/apcorr_and_photocal_sourc…

…e_selection

Apply S/N cuts on sources used for aperture correction and zp calculation

config/imsim/processCcd.py

@@ -30,6 +30,12 @@
 config.calibrate.astrometry.referenceSelector.unresolved.minimum = None
 config.calibrate.astrometry.referenceSelector.unresolved.maximum = 0.5
 
+# Make sure galaxies are not used for zero-point calculation.
+config.calibrate.photoCal.match.referenceSelection.doUnresolved = True
+config.calibrate.photoCal.match.referenceSelection.unresolved.name = 'resolved'
+config.calibrate.photoCal.match.referenceSelection.unresolved.minimum = None
+config.calibrate.photoCal.match.referenceSelection.unresolved.maximum = 0.5
+
 # DM-17043 and DM-16785
 config.charImage.measurePsf.starSelector["objectSize"].doFluxLimit = False
 config.charImage.measurePsf.starSelector["objectSize"].doSignalToNoiseLimit = True
@@ -38,3 +44,20 @@
 # Discussed on Slack #desc-dm-dc2 with Lauren and set to 200 for Run2.1i
 # For Run2.2i, setting to zero per https://github.com/LSSTDESC/ImageProcessingPipelines/issues/136
 config.charImage.measurePsf.starSelector["objectSize"].signalToNoiseMax = 0
+
+# S/N cuts for computing aperture corrections.
+config.charImage.measureApCorr.sourceSelector['science'].doFlags = True
+config.charImage.measureApCorr.sourceSelector['science'].doSignalToNoise = True
+config.charImage.measureApCorr.sourceSelector['science'].flags.good = ['calib_psf_used']
+config.charImage.measureApCorr.sourceSelector['science'].flags.bad = []
+config.charImage.measureApCorr.sourceSelector['science'].signalToNoise.minimum = 150.0
+config.charImage.measureApCorr.sourceSelector['science'].signalToNoise.maximum = None
+config.charImage.measureApCorr.sourceSelector['science'].signalToNoise.fluxField = 'base_PsfFlux_instFlux'
+config.charImage.measureApCorr.sourceSelector['science'].signalToNoise.errField = 'base_PsfFlux_instFluxErr'
+config.charImage.measureApCorr.sourceSelector.name = 'science'
+
+# S/N cuts for zero-point calculation
+config.calibrate.photoCal.match.sourceSelection.doSignalToNoise = True
+config.calibrate.photoCal.match.sourceSelection.signalToNoise.minimum = 150
+config.calibrate.photoCal.match.sourceSelection.signalToNoise.fluxField = 'base_PsfFlux_instFlux'
+config.calibrate.photoCal.match.sourceSelection.signalToNoise.errField = 'base_PsfFlux_instFluxErr'