Rudimentary CalibrateImage config for LATISS

Mostly just copied/renamed fields from the existing characterize/calibrate
configs, removing settings that are no longer valid (e.g. base_Jacobian isn't
being run).

config/latiss/calibrateImage.py

@@ -0,0 +1,67 @@
+import os.path
+
+from lsst.meas.algorithms import ColorLimit
+
+config_dir = os.path.dirname(__file__)
+
+# Some modifications to the objectSize selector for PSF estimation optimized
+# for LATISS data.
+config.psf_measure_psf.starSelector["objectSize"].signalToNoiseMin = 10
+config.psf_measure_psf.starSelector["objectSize"].widthStdAllowed = 0.28
+config.psf_measure_psf.starSelector["objectSize"].widthMax = 14.0
+
+# We are starved for PSF stars, so don't reserve any at this stage.
+config.psf_measure_psf.reserve.fraction = 0.0
+
+# Reduce psfex spatialOrder to 1, this helps ensure success with low numbers of psf candidates.
+config.psf_measure_psf.psfDeterminer["psfex"].spatialOrder = 1
+# Set the default kernel and stamp sizes for PSF modeling appropriate for LATISS
+config.psf_measure_psf.makePsfCandidates.kernelSize = 71
+config.psf_measure_psf.psfDeterminer["psfex"].stampSize = 71
+
+config.install_simple_psf.width = 21
+config.install_simple_psf.fwhm = 2.355*2  # LATISS plate scale is 2x LSST nominal
+
+# Turn off S/N cut for aperture correction measurement source selection
+# (it now only includes calib_psf_used objects, and that cut is "good
+# enough" for the shallow LATISS data).
+config.measure_aperture_correction.sourceSelector["science"].doSignalToNoise = False
+
+# Configure the photometry to use atlas_refcat2.
+config.connections.photometry_ref_cat = "atlas_refcat2_20220201"
+config.photometry_ref_loader.load(os.path.join(config_dir, "filterMap.py"))
+
+config.photometry.match.referenceSelection.magLimit.fluxField = "r_flux"
+colors = config.photometry.match.referenceSelection.colorLimits
+colors["g-r"] = ColorLimit(primary="g_flux", secondary="r_flux", minimum=0.4, maximum=2.0)
+
+config.photometry.applyColorTerms = True
+config.photometry.colorterms.load(os.path.join(config_dir, "colorterms.py"))
+
+# Note that the following two config values were validated on data taken in
+# 2022-11 and 2022-12, which is after some major improvements were made to
+# the pointing accuracy of AuxTel. The improvements came from updates made
+# in 2022-05 (with further improvements throughout the year). As such, these
+# configs are likely only appropriate for data starting from 2022-05. If
+# processing earlier data, these may need to be relaxed to the previous values
+# (pixelMargin = 900 & maxOffsetPix = 3000) to avoid astrometric fit failures.
+config.astrometry_ref_loader.pixelMargin = 250
+config.astrometry.matcher.maxOffsetPix = 900
+
+# These allow a better chance of finding a match for the otherwise "Unabel to
+# match sources" cases.
+config.astrometry.matcher.numPointsForShape = 5
+config.astrometry.matcher.numPointsForShapeAttempt = 8
+
+# Apply a magnitude limit and decrease the SNR limit as we're only a 1.2m
+# and frequently take short exposures.
+config.astrometry.referenceSelector.doMagLimit = True
+config.astrometry.referenceSelector.magLimit.minimum = 8
+config.astrometry.referenceSelector.magLimit.maximum = 18
+config.astrometry.referenceSelector.magLimit.fluxField = "phot_g_mean_flux"
+config.astrometry.matcher.maxRotationDeg = 2.0
+
+# Set the default aperture as appropriate for the LATISS plate scale.
+config.star_measurement.plugins["base_CircularApertureFlux"].radii = [35.0]
+config.star_measurement.slots.apFlux = 'base_CircularApertureFlux_35_0'
+config.star_measurement.slots.calibFlux = 'base_CircularApertureFlux_35_0'