makeWarp.py

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# This file is part of pipe_tasks.
#
# Developed for the LSST Data Management System.
# This product includes software developed by the LSST Project
# (https://www.lsst.org).
# See the COPYRIGHT file at the top-level directory of this distribution
# for details of code ownership.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# GNU General Public License for more details.
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__all__ = ["MakeWarpTask", "MakeWarpConfig"]
 
import logging
import numpy
 
import lsst.pex.config as pexConfig
import lsst.afw.image as afwImage
import lsst.coadd.utils as coaddUtils
import lsst.pipe.base as pipeBase
import lsst.pipe.base.connectionTypes as connectionTypes
import lsst.utils as utils
import lsst.geom
from lsst.daf.butler import DeferredDatasetHandle
from lsst.meas.base import DetectorVisitIdGeneratorConfig
from lsst.meas.algorithms import CoaddPsf, CoaddPsfConfig
from lsst.skymap import BaseSkyMap
from lsst.utils.timer import timeMethod
from .coaddBase import CoaddBaseTask, makeSkyInfo, reorderAndPadList
from .warpAndPsfMatch import WarpAndPsfMatchTask
from collections.abc import Iterable
 
log = logging.getLogger(__name__)
 
 
class MakeWarpConnections(pipeBase.PipelineTaskConnections,
                          dimensions=("tract", "patch", "skymap", "instrument", "visit"),
                          defaultTemplates={"coaddName": "deep",
                                            "skyWcsName": "gbdesAstrometricFit",
                                            "photoCalibName": "fgcm",
                                            "calexpType": ""},
                          # TODO: remove on DM-39854.
                          deprecatedTemplates={"skyWcsName": "Deprecated; will be removed after v26.",
                                               "photoCalibName": "Deprecated; will be removed after v26."}):
    calExpList = connectionTypes.Input(
        doc="Input exposures to be resampled and optionally PSF-matched onto a SkyMap projection/patch",
        name="{calexpType}calexp",
        storageClass="ExposureF",
        dimensions=("instrument", "visit", "detector"),
        multiple=True,
        deferLoad=True,
    )
    backgroundList = connectionTypes.Input(
        doc="Input backgrounds to be added back into the calexp if bgSubtracted=False",
        name="calexpBackground",
        storageClass="Background",
        dimensions=("instrument", "visit", "detector"),
        multiple=True,
    )
    skyCorrList = connectionTypes.Input(
        doc="Input Sky Correction to be subtracted from the calexp if doApplySkyCorr=True",
        name="skyCorr",
        storageClass="Background",
        dimensions=("instrument", "visit", "detector"),
        multiple=True,
    )
    skyMap = connectionTypes.Input(
        doc="Input definition of geometry/bbox and projection/wcs for warped exposures",
        name=BaseSkyMap.SKYMAP_DATASET_TYPE_NAME,
        storageClass="SkyMap",
        dimensions=("skymap",),
    )
    externalSkyWcsTractCatalog = connectionTypes.Input(
        doc=("Per-tract, per-visit wcs calibrations.  These catalogs use the detector "
             "id for the catalog id, sorted on id for fast lookup."),
        name="{skyWcsName}SkyWcsCatalog",
        storageClass="ExposureCatalog",
        dimensions=("instrument", "visit", "tract"),
        # TODO: remove on DM-39854.
        deprecated="Deprecated in favor of 'visitSummary'.  Will be removed after v26.",
    )
    externalSkyWcsGlobalCatalog = connectionTypes.Input(
        doc=("Per-visit wcs calibrations computed globally (with no tract information). "
             "These catalogs use the detector id for the catalog id, sorted on id for "
             "fast lookup."),
        name="finalVisitSummary",
        storageClass="ExposureCatalog",
        dimensions=("instrument", "visit"),
        # TODO: remove on DM-39854.
        deprecated="Deprecated in favor of 'visitSummary'.  Will be removed after v26.",
    )
    externalPhotoCalibTractCatalog = connectionTypes.Input(
        doc=("Per-tract, per-visit photometric calibrations.  These catalogs use the "
             "detector id for the catalog id, sorted on id for fast lookup."),
        name="{photoCalibName}PhotoCalibCatalog",
        storageClass="ExposureCatalog",
        dimensions=("instrument", "visit", "tract"),
        # TODO: remove on DM-39854.
        deprecated="Deprecated in favor of 'visitSummary'.  Will be removed after v26.",
    )
    externalPhotoCalibGlobalCatalog = connectionTypes.Input(
        doc=("Per-visit photometric calibrations computed globally (with no tract "
             "information).  These catalogs use the detector id for the catalog id, "
             "sorted on id for fast lookup."),
        name="finalVisitSummary",
        storageClass="ExposureCatalog",
        dimensions=("instrument", "visit"),
        # TODO: remove on DM-39854.
        deprecated="Deprecated in favor of 'visitSummary'.  Will be removed after v26.",
    )
    finalizedPsfApCorrCatalog = connectionTypes.Input(
        doc=("Per-visit finalized psf models and aperture correction maps. "
             "These catalogs use the detector id for the catalog id, "
             "sorted on id for fast lookup."),
        name="finalVisitSummary",
        storageClass="ExposureCatalog",
        dimensions=("instrument", "visit"),
        # TODO: remove on DM-39854.
        deprecated="Deprecated in favor of 'visitSummary'.  Will be removed after v26.",
    )
    direct = connectionTypes.Output(
        doc=("Output direct warped exposure (previously called CoaddTempExp), produced by resampling ",
             "calexps onto the skyMap patch geometry."),
        name="{coaddName}Coadd_directWarp",
        storageClass="ExposureF",
        dimensions=("tract", "patch", "skymap", "visit", "instrument"),
    )
    psfMatched = connectionTypes.Output(
        doc=("Output PSF-Matched warped exposure (previously called CoaddTempExp), produced by resampling ",
             "calexps onto the skyMap patch geometry and PSF-matching to a model PSF."),
        name="{coaddName}Coadd_psfMatchedWarp",
        storageClass="ExposureF",
        dimensions=("tract", "patch", "skymap", "visit", "instrument"),
    )
    wcsList = connectionTypes.Input(
        doc="WCSs of calexps used by SelectImages subtask to determine if the calexp overlaps the patch",
        name="{calexpType}calexp.wcs",
        storageClass="Wcs",
        dimensions=("instrument", "visit", "detector"),
        multiple=True,
        # TODO: remove on DM-39854
        deprecated=(
            "Deprecated in favor of the 'visitSummary' connection (and already ignored). "
            "Will be removed after v26."
        )
    )
    bboxList = connectionTypes.Input(
        doc="BBoxes of calexps used by SelectImages subtask to determine if the calexp overlaps the patch",
        name="{calexpType}calexp.bbox",
        storageClass="Box2I",
        dimensions=("instrument", "visit", "detector"),
        multiple=True,
        # TODO: remove on DM-39854
        deprecated=(
            "Deprecated in favor of the 'visitSummary' connection (and already ignored). "
            "Will be removed after v26."
        )
    )
    visitSummary = connectionTypes.Input(
        doc="Input visit-summary catalog with updated calibration objects.",
        name="finalVisitSummary",
        storageClass="ExposureCatalog",
        dimensions=("instrument", "visit",),
    )
 
    def __init__(self, *, config=None):
        if config.bgSubtracted:
            del self.backgroundList
        if not config.doApplySkyCorr:
            del self.skyCorrList
        # TODO: remove all "external" checks on DM-39854
        if config.doApplyExternalSkyWcs:
            if config.useGlobalExternalSkyWcs:
                del self.externalSkyWcsTractCatalog
            else:
                del self.externalSkyWcsGlobalCatalog
        else:
            del self.externalSkyWcsTractCatalog
            del self.externalSkyWcsGlobalCatalog
        if config.doApplyExternalPhotoCalib:
            if config.useGlobalExternalPhotoCalib:
                del self.externalPhotoCalibTractCatalog
            else:
                del self.externalPhotoCalibGlobalCatalog
        else:
            del self.externalPhotoCalibTractCatalog
            del self.externalPhotoCalibGlobalCatalog
        if not config.doApplyFinalizedPsf:
            del self.finalizedPsfApCorrCatalog
        if not config.makeDirect:
            del self.direct
        if not config.makePsfMatched:
            del self.psfMatched
        # We always drop the deprecated wcsList and bboxList connections,
        # since we can always get equivalents from the visitSummary dataset.
        # Removing them here avoids the deprecation warning, but we do have
        # to deprecate rather than immediately remove them to keep old configs
        # usable for a bit.
        # TODO: remove on DM-39854
        del self.bboxList
        del self.wcsList
 
 
class MakeWarpConfig(pipeBase.PipelineTaskConfig, CoaddBaseTask.ConfigClass,
                     pipelineConnections=MakeWarpConnections):
    """Config for MakeWarpTask."""
 
    warpAndPsfMatch = pexConfig.ConfigurableField(
        target=WarpAndPsfMatchTask,
        doc="Task to warp and PSF-match calexp",
    )
    doWrite = pexConfig.Field(
        doc="persist <coaddName>Coadd_<warpType>Warp",
        dtype=bool,
        default=True,
    )
    bgSubtracted = pexConfig.Field(
        doc="Work with a background subtracted calexp?",
        dtype=bool,
        default=True,
    )
    coaddPsf = pexConfig.ConfigField(
        doc="Configuration for CoaddPsf",
        dtype=CoaddPsfConfig,
    )
    makeDirect = pexConfig.Field(
        doc="Make direct Warp/Coadds",
        dtype=bool,
        default=True,
    )
    makePsfMatched = pexConfig.Field(
        doc="Make Psf-Matched Warp/Coadd?",
        dtype=bool,
        default=False,
    )
    useVisitSummaryPsf = pexConfig.Field(
        doc=(
            "If True, use the PSF model and aperture corrections from the 'visitSummary' connection. "
            "If False, use the PSF model and aperture corrections from the 'exposure' connection. "
            # TODO: remove this next sentence on DM-39854.
            "The finalizedPsfApCorrCatalog connection (if enabled) takes precedence over either."
        ),
        dtype=bool,
        default=True,
    )
    doWriteEmptyWarps = pexConfig.Field(
        dtype=bool,
        default=False,
        doc="Write out warps even if they are empty"
    )
    hasFakes = pexConfig.Field(
        doc="Should be set to True if fake sources have been inserted into the input data.",
        dtype=bool,
        default=False,
    )
    doApplySkyCorr = pexConfig.Field(
        dtype=bool,
        default=False,
        doc="Apply sky correction?",
    )
    doApplyFinalizedPsf = pexConfig.Field(
        doc="Whether to apply finalized psf models and aperture correction map.",
        dtype=bool,
        default=True,
        # TODO: remove on DM-39854.
        deprecated="Deprecated in favor of useVisitSummaryPsf.  Will be removed after v26.",
    )
    idGenerator = DetectorVisitIdGeneratorConfig.make_field()
 
    def validate(self):
        CoaddBaseTask.ConfigClass.validate(self)
 
        if not self.makePsfMatched and not self.makeDirect:
            raise RuntimeError("At least one of config.makePsfMatched and config.makeDirect must be True")
        if self.doPsfMatch:  # TODO: Remove this in DM-39841
            # Backwards compatibility.
            log.warning("Config doPsfMatch deprecated. Setting makePsfMatched=True and makeDirect=False")
            self.makePsfMatched = True
            self.makeDirect = False
 
    def setDefaults(self):
        CoaddBaseTask.ConfigClass.setDefaults(self)
        self.warpAndPsfMatch.psfMatch.kernel.active.kernelSize = self.matchingKernelSize
 
 
class MakeWarpTask(CoaddBaseTask):
    """Warp and optionally PSF-Match calexps onto an a common projection.
 
    Warp and optionally PSF-Match calexps onto a common projection, by
    performing the following operations:
    - Group calexps by visit/run
    - For each visit, generate a Warp by calling method @ref run.
      `run` loops over the visit's calexps calling
      `~lsst.pipe.tasks.warpAndPsfMatch.WarpAndPsfMatchTask` on each visit
 
    """
    ConfigClass = MakeWarpConfig
    _DefaultName = "makeWarp"
 
    def __init__(self, **kwargs):
        CoaddBaseTask.__init__(self, **kwargs)
        self.makeSubtask("warpAndPsfMatch")
        if self.config.hasFakes:
            self.calexpType = "fakes_calexp"
        else:
            self.calexpType = "calexp"
 
    @utils.inheritDoc(pipeBase.PipelineTask)
    def runQuantum(self, butlerQC, inputRefs, outputRefs):
        # Obtain the list of input detectors from calExpList.  Sort them by
        # detector order (to ensure reproducibility).  Then ensure all input
        # lists are in the same sorted detector order.
        detectorOrder = [ref.datasetRef.dataId['detector'] for ref in inputRefs.calExpList]
        detectorOrder.sort()
        inputRefs = reorderRefs(inputRefs, detectorOrder, dataIdKey='detector')
 
        # Read in all inputs.
        inputs = butlerQC.get(inputRefs)
 
        # Construct skyInfo expected by `run`.  We remove the SkyMap itself
        # from the dictionary so we can pass it as kwargs later.
        skyMap = inputs.pop("skyMap")
        quantumDataId = butlerQC.quantum.dataId
        skyInfo = makeSkyInfo(skyMap, tractId=quantumDataId['tract'], patchId=quantumDataId['patch'])
 
        # Construct list of input DataIds expected by `run`.
        dataIdList = [ref.datasetRef.dataId for ref in inputRefs.calExpList]
        # Construct list of packed integer IDs expected by `run`.
        ccdIdList = [
            self.config.idGenerator.apply(dataId).catalog_id
            for dataId in dataIdList
        ]
 
        visitSummary = inputs["visitSummary"]
        bboxList = []
        wcsList = []
        for dataId in dataIdList:
            row = visitSummary.find(dataId["detector"])
            if row is None:
                raise RuntimeError(
                    f"Unexpectedly incomplete visitSummary provided to makeWarp: {dataId} is missing."
                )
            bboxList.append(row.getBBox())
            wcsList.append(row.getWcs())
        inputs["bboxList"] = bboxList
        inputs["wcsList"] = wcsList
 
        if self.config.doApplyExternalSkyWcs:
            if self.config.useGlobalExternalSkyWcs:
                externalSkyWcsCatalog = inputs.pop("externalSkyWcsGlobalCatalog")
            else:
                externalSkyWcsCatalog = inputs.pop("externalSkyWcsTractCatalog")
        else:
            externalSkyWcsCatalog = None
 
        if self.config.doApplyExternalPhotoCalib:
            if self.config.useGlobalExternalPhotoCalib:
                externalPhotoCalibCatalog = inputs.pop("externalPhotoCalibGlobalCatalog")
            else:
                externalPhotoCalibCatalog = inputs.pop("externalPhotoCalibTractCatalog")
        else:
            externalPhotoCalibCatalog = None
 
        if self.config.doApplyFinalizedPsf:
            finalizedPsfApCorrCatalog = inputs.pop("finalizedPsfApCorrCatalog")
        else:
            finalizedPsfApCorrCatalog = None
 
        # Do an initial selection on inputs with complete wcs/photoCalib info.
        # Qualifying calexps will be read in the following call.
        completeIndices = self._prepareCalibratedExposures(
            **inputs,
            externalSkyWcsCatalog=externalSkyWcsCatalog,
            externalPhotoCalibCatalog=externalPhotoCalibCatalog,
            finalizedPsfApCorrCatalog=finalizedPsfApCorrCatalog,
        )
        inputs = self.filterInputs(indices=completeIndices, inputs=inputs)
 
        # Do another selection based on the configured selection task
        # (using updated WCSs to determine patch overlap if an external
        # calibration was applied).
        cornerPosList = lsst.geom.Box2D(skyInfo.bbox).getCorners()
        coordList = [skyInfo.wcs.pixelToSky(pos) for pos in cornerPosList]
        goodIndices = self.select.run(**inputs, coordList=coordList, dataIds=dataIdList)
        inputs = self.filterInputs(indices=goodIndices, inputs=inputs)
 
        # Extract integer visitId requested by `run`.
        visitId = dataIdList[0]["visit"]
 
        results = self.run(**inputs,
                           visitId=visitId,
                           ccdIdList=[ccdIdList[i] for i in goodIndices],
                           dataIdList=[dataIdList[i] for i in goodIndices],
                           skyInfo=skyInfo)
        if self.config.makeDirect and results.exposures["direct"] is not None:
            butlerQC.put(results.exposures["direct"], outputRefs.direct)
        if self.config.makePsfMatched and results.exposures["psfMatched"] is not None:
            butlerQC.put(results.exposures["psfMatched"], outputRefs.psfMatched)
 
    @timeMethod
    def run(self, calExpList, ccdIdList, skyInfo, visitId=0, dataIdList=None, **kwargs):
        """Create a Warp from inputs.
 
        We iterate over the multiple calexps in a single exposure to construct
        the warp (previously called a coaddTempExp) of that exposure to the
        supplied tract/patch.
 
        Pixels that receive no pixels are set to NAN; this is not correct
        (violates LSST algorithms group policy), but will be fixed up by
        interpolating after the coaddition.
 
        calexpRefList : `list`
            List of data references for calexps that (may)
            overlap the patch of interest.
        skyInfo : `lsst.pipe.base.Struct`
            Struct from `~lsst.pipe.base.coaddBase.makeSkyInfo()` with
            geometric information about the patch.
        visitId : `int`
            Integer identifier for visit, for the table that will
            produce the CoaddPsf.
 
        Returns
        -------
        result : `lsst.pipe.base.Struct`
            Results as a struct with attributes:
 
            ``exposures``
                A dictionary containing the warps requested:
                "direct": direct warp if ``config.makeDirect``
                "psfMatched": PSF-matched warp if ``config.makePsfMatched``
                (`dict`).
        """
        warpTypeList = self.getWarpTypeList()
 
        totGoodPix = {warpType: 0 for warpType in warpTypeList}
        didSetMetadata = {warpType: False for warpType in warpTypeList}
        warps = {warpType: self._prepareEmptyExposure(skyInfo) for warpType in warpTypeList}
        inputRecorder = {warpType: self.inputRecorder.makeCoaddTempExpRecorder(visitId, len(calExpList))
                         for warpType in warpTypeList}
 
        modelPsf = self.config.modelPsf.apply() if self.config.makePsfMatched else None
        if dataIdList is None:
            dataIdList = ccdIdList
 
        for calExpInd, (calExp, ccdId, dataId) in enumerate(zip(calExpList, ccdIdList, dataIdList)):
            self.log.info("Processing calexp %d of %d for this Warp: id=%s",
                          calExpInd+1, len(calExpList), dataId)
            try:
                warpedAndMatched = self.warpAndPsfMatch.run(calExp, modelPsf=modelPsf,
                                                            wcs=skyInfo.wcs, maxBBox=skyInfo.bbox,
                                                            makeDirect=self.config.makeDirect,
                                                            makePsfMatched=self.config.makePsfMatched)
            except Exception as e:
                self.log.warning("WarpAndPsfMatch failed for calexp %s; skipping it: %s", dataId, e)
                continue
            try:
                numGoodPix = {warpType: 0 for warpType in warpTypeList}
                for warpType in warpTypeList:
                    exposure = warpedAndMatched.getDict()[warpType]
                    if exposure is None:
                        continue
                    warp = warps[warpType]
                    if didSetMetadata[warpType]:
                        mimg = exposure.getMaskedImage()
                        mimg *= (warp.getPhotoCalib().getInstFluxAtZeroMagnitude()
                                 / exposure.getPhotoCalib().getInstFluxAtZeroMagnitude())
                        del mimg
                    numGoodPix[warpType] = coaddUtils.copyGoodPixels(
                        warp.getMaskedImage(), exposure.getMaskedImage(), self.getBadPixelMask())
                    totGoodPix[warpType] += numGoodPix[warpType]
                    self.log.debug("Calexp %s has %d good pixels in this patch (%.1f%%) for %s",
                                   dataId, numGoodPix[warpType],
                                   100.0*numGoodPix[warpType]/skyInfo.bbox.getArea(), warpType)
                    if numGoodPix[warpType] > 0 and not didSetMetadata[warpType]:
                        warp.info.id = exposure.info.id
                        warp.setPhotoCalib(exposure.getPhotoCalib())
                        warp.setFilter(exposure.getFilter())
                        warp.getInfo().setVisitInfo(exposure.getInfo().getVisitInfo())
                        # PSF replaced with CoaddPsf after loop if and only if
                        # creating direct warp.
                        warp.setPsf(exposure.getPsf())
                        didSetMetadata[warpType] = True
 
                    # Need inputRecorder for CoaddApCorrMap for both direct and
                    # PSF-matched.
                    inputRecorder[warpType].addCalExp(calExp, ccdId, numGoodPix[warpType])
 
            except Exception as e:
                self.log.warning("Error processing calexp %s; skipping it: %s", dataId, e)
                continue
 
        for warpType in warpTypeList:
            self.log.info("%sWarp has %d good pixels (%.1f%%)",
                          warpType, totGoodPix[warpType], 100.0*totGoodPix[warpType]/skyInfo.bbox.getArea())
 
            if totGoodPix[warpType] > 0 and didSetMetadata[warpType]:
                inputRecorder[warpType].finish(warps[warpType], totGoodPix[warpType])
                if warpType == "direct":
                    warps[warpType].setPsf(
                        CoaddPsf(inputRecorder[warpType].coaddInputs.ccds, skyInfo.wcs,
                                 self.config.coaddPsf.makeControl()))
            else:
                if not self.config.doWriteEmptyWarps:
                    # No good pixels. Exposure still empty.
                    warps[warpType] = None
                    # NoWorkFound is unnecessary as the downstream tasks will
                    # adjust the quantum accordingly.
 
        result = pipeBase.Struct(exposures=warps)
        return result
 
    def filterInputs(self, indices, inputs):
        """Filter task inputs by their indices.
 
        Parameters
        ----------
        indices : `list` [`int`]
        inputs : `dict` [`list`]
            A dictionary of input connections to be passed to run.
 
        Returns
        -------
        inputs : `dict` [`list`]
            Task inputs with their lists filtered by indices.
        """
        for key in inputs.keys():
            # Only down-select on list inputs
            if isinstance(inputs[key], list):
                inputs[key] = [inputs[key][ind] for ind in indices]
        return inputs
 
    def _prepareCalibratedExposures(self, calExpList=[], wcsList=None, backgroundList=None, skyCorrList=None,
                                    externalSkyWcsCatalog=None, externalPhotoCalibCatalog=None,
                                    finalizedPsfApCorrCatalog=None, visitSummary=None, **kwargs):
        """Calibrate and add backgrounds to input calExpList in place.
 
        Parameters
        ----------
        calExpList : `list` [`lsst.afw.image.Exposure` or
                     `lsst.daf.butler.DeferredDatasetHandle`]
            Sequence of calexps to be modified in place.
        wcsList : `list` [`lsst.afw.geom.SkyWcs`]
            The WCSs of the calexps in ``calExpList``.  When
            ``externalSkyCatalog`` is `None`, these are used to determine if
            the calexp should be included in the warp, namely checking that it
            is not `None`.  If ``externalSkyCatalog`` is not `None`, this list
            will be dynamically updated with the external sky WCS.
        backgroundList : `list` [`lsst.afw.math.backgroundList`], optional
            Sequence of backgrounds to be added back in if bgSubtracted=False.
        skyCorrList : `list` [`lsst.afw.math.backgroundList`], optional
            Sequence of background corrections to be subtracted if
            doApplySkyCorr=True.
        externalSkyWcsCatalog : `lsst.afw.table.ExposureCatalog`, optional
            Exposure catalog with external skyWcs to be applied
            if config.doApplyExternalSkyWcs=True.  Catalog uses the detector id
            for the catalog id, sorted on id for fast lookup.
            Deprecated and will be removed after v26.
        externalPhotoCalibCatalog : `lsst.afw.table.ExposureCatalog`, optional
            Exposure catalog with external photoCalib to be applied
            if config.doApplyExternalPhotoCalib=True.  Catalog uses the
            detector id for the catalog id, sorted on id for fast lookup.
            Deprecated and will be removed after v26.
        finalizedPsfApCorrCatalog : `lsst.afw.table.ExposureCatalog`, optional
            Exposure catalog with finalized psf models and aperture correction
            maps to be applied if config.doApplyFinalizedPsf=True.  Catalog
            uses the detector id for the catalog id, sorted on id for fast
            lookup.
            Deprecated and will be removed after v26.
        visitSummary : `lsst.afw.table.ExposureCatalog`, optional
            Exposure catalog with potentially all calibrations.  Attributes set
            to `None` are ignored.
        **kwargs
            Additional keyword arguments.
 
        Returns
        -------
        indices : `list` [`int`]
            Indices of ``calExpList`` and friends that have valid
            photoCalib/skyWcs.
        """
        wcsList = len(calExpList)*[None] if wcsList is None else wcsList
        backgroundList = len(calExpList)*[None] if backgroundList is None else backgroundList
        skyCorrList = len(calExpList)*[None] if skyCorrList is None else skyCorrList
 
        includeCalibVar = self.config.includeCalibVar
 
        indices = []
        for index, (calexp, wcs, background, skyCorr) in enumerate(zip(calExpList,
                                                                       wcsList,
                                                                       backgroundList,
                                                                       skyCorrList)):
            if externalSkyWcsCatalog is None and wcs is None:
                self.log.warning("Detector id %d for visit %d has None for skyWcs and will not be "
                                 "used in the warp", calexp.dataId["detector"], calexp.dataId["visit"])
                continue
 
            if isinstance(calexp, DeferredDatasetHandle):
                calexp = calexp.get()
 
            if not self.config.bgSubtracted:
                calexp.maskedImage += background.getImage()
 
            detectorId = calexp.info.getDetector().getId()
 
            # Load all calibrations from visitSummary.
            if visitSummary is not None:
                row = visitSummary.find(detectorId)
                if row is None:
                    raise RuntimeError(
                        f"Unexpectedly incomplete visitSummary: detector={detectorId} is missing."
                    )
                if (photoCalib := row.getPhotoCalib()) is not None:
                    calexp.setPhotoCalib(photoCalib)
                if (skyWcs := row.getWcs()) is not None:
                    calexp.setWcs(skyWcs)
                    wcsList[index] = skyWcs
                if self.config.useVisitSummaryPsf:
                    if (psf := row.getPsf()) is not None:
                        calexp.setPsf(psf)
                    if (apCorrMap := row.getApCorrMap()) is not None:
                        calexp.info.setApCorrMap(apCorrMap)
                # TODO: on DM-39854 the logic in the 'elif' blocks below could
                # be moved into 'else' blocks above (or otherwise simplified
                # substantially) after the 'external' arguments are removed.
 
            # Find the external photoCalib.
            if externalPhotoCalibCatalog is not None:
                row = externalPhotoCalibCatalog.find(detectorId)
                if row is None:
                    self.log.warning("Detector id %s not found in externalPhotoCalibCatalog "
                                     "and will not be used in the warp.", detectorId)
                    continue
                photoCalib = row.getPhotoCalib()
                if photoCalib is None:
                    self.log.warning("Detector id %s has None for photoCalib in externalPhotoCalibCatalog "
                                     "and will not be used in the warp.", detectorId)
                    continue
                calexp.setPhotoCalib(photoCalib)
            elif photoCalib is None:
                self.log.warning("Detector id %s has None for photoCalib in the visit summary "
                                 "and will not be used in the warp.", detectorId)
                continue
 
            # Find and apply external skyWcs.
            if externalSkyWcsCatalog is not None:
                row = externalSkyWcsCatalog.find(detectorId)
                if row is None:
                    self.log.warning("Detector id %s not found in externalSkyWcsCatalog "
                                     "and will not be used in the warp.", detectorId)
                    continue
                skyWcs = row.getWcs()
                wcsList[index] = skyWcs
                if skyWcs is None:
                    self.log.warning("Detector id %s has None for skyWcs in externalSkyWcsCatalog "
                                     "and will not be used in the warp.", detectorId)
                    continue
                calexp.setWcs(skyWcs)
            elif skyWcs is None:
                self.log.warning("Detector id %s has None for skyWcs in the visit summary "
                                 "and will not be used in the warp.", detectorId)
                continue
 
            # Find and apply finalized psf and aperture correction.
            if finalizedPsfApCorrCatalog is not None:
                row = finalizedPsfApCorrCatalog.find(detectorId)
                if row is None:
                    self.log.warning("Detector id %s not found in finalizedPsfApCorrCatalog "
                                     "and will not be used in the warp.", detectorId)
                    continue
                psf = row.getPsf()
                if psf is None:
                    self.log.warning("Detector id %s has None for psf in finalizedPsfApCorrCatalog "
                                     "and will not be used in the warp.", detectorId)
                    continue
                calexp.setPsf(psf)
                apCorrMap = row.getApCorrMap()
                if apCorrMap is None:
                    self.log.warning("Detector id %s has None for ApCorrMap in finalizedPsfApCorrCatalog "
                                     "and will not be used in the warp.", detectorId)
                    continue
                calexp.info.setApCorrMap(apCorrMap)
            elif self.config.useVisitSummaryPsf:
                if psf is None:
                    self.log.warning("Detector id %s has None for PSF in the visit summary "
                                     "and will not be used in the warp.", detectorId)
                if apCorrMap is None:
                    self.log.warning("Detector id %s has None for ApCorrMap in the visit summary "
                                     "and will not be used in the warp.", detectorId)
            else:
                if calexp.getPsf() is None:
                    self.log.warning("Detector id %s has None for PSF in the calexp "
                                     "and will not be used in the warp.", detectorId)
                if calexp.info.getApCorrMap() is None:
                    self.log.warning("Detector id %s has None for ApCorrMap in the calexp "
                                     "and will not be used in the warp.", detectorId)
                    continue
 
            # Calibrate the image.
            calexp.maskedImage = photoCalib.calibrateImage(calexp.maskedImage,
                                                           includeScaleUncertainty=includeCalibVar)
            calexp.maskedImage /= photoCalib.getCalibrationMean()
            # TODO: The images will have a calibration of 1.0 everywhere once
            # RFC-545 is implemented.
            # exposure.setCalib(afwImage.Calib(1.0))
 
            # Apply skycorr
            if self.config.doApplySkyCorr:
                calexp.maskedImage -= skyCorr.getImage()
 
            indices.append(index)
            calExpList[index] = calexp
 
        return indices
 
    @staticmethod
    def _prepareEmptyExposure(skyInfo):
        """Produce an empty exposure for a given patch.
 
        Parameters
        ----------
        skyInfo : `lsst.pipe.base.Struct`
            Struct from `~lsst.pipe.base.coaddBase.makeSkyInfo()` with
            geometric information about the patch.
 
        Returns
        -------
        exp : `lsst.afw.image.exposure.ExposureF`
            An empty exposure for a given patch.
        """
        exp = afwImage.ExposureF(skyInfo.bbox, skyInfo.wcs)
        exp.getMaskedImage().set(numpy.nan, afwImage.Mask
                                 .getPlaneBitMask("NO_DATA"), numpy.inf)
        return exp
 
    def getWarpTypeList(self):
        """Return list of requested warp types per the config.
        """
        warpTypeList = []
        if self.config.makeDirect:
            warpTypeList.append("direct")
        if self.config.makePsfMatched:
            warpTypeList.append("psfMatched")
        return warpTypeList
 
 
def reorderRefs(inputRefs, outputSortKeyOrder, dataIdKey):
    """Reorder inputRefs per outputSortKeyOrder.
 
    Any inputRefs which are lists will be resorted per specified key e.g.,
    'detector.' Only iterables will be reordered, and values can be of type
    `lsst.pipe.base.connections.DeferredDatasetRef` or
    `lsst.daf.butler.core.datasets.ref.DatasetRef`.
 
    Returned lists of refs have the same length as the outputSortKeyOrder.
    If an outputSortKey not in the inputRef, then it will be padded with None.
    If an inputRef contains an inputSortKey that is not in the
    outputSortKeyOrder it will be removed.
 
    Parameters
    ----------
    inputRefs : `lsst.pipe.base.connections.QuantizedConnection`
        Input references to be reordered and padded.
    outputSortKeyOrder : `iterable`
        Iterable of values to be compared with inputRef's dataId[dataIdKey].
    dataIdKey : `str`
        The data ID key in the dataRefs to compare with the outputSortKeyOrder.
 
    Returns
    -------
    inputRefs : `lsst.pipe.base.connections.QuantizedConnection`
        Quantized Connection with sorted DatasetRef values sorted if iterable.
    """
    for connectionName, refs in inputRefs:
        if isinstance(refs, Iterable):
            if hasattr(refs[0], "dataId"):
                inputSortKeyOrder = [ref.dataId[dataIdKey] for ref in refs]
            else:
                inputSortKeyOrder = [ref.datasetRef.dataId[dataIdKey] for ref in refs]
            if inputSortKeyOrder != outputSortKeyOrder:
                setattr(inputRefs, connectionName,
                        reorderAndPadList(refs, inputSortKeyOrder, outputSortKeyOrder))
    return inputRefs