lsst.meas.base.forcedPhotCcd.documentation Class Reference

Inheritance diagram for lsst.meas.base.forcedPhotCcd.documentation:

Detailed Description

ConfigClass = ForcedPhotCcdConfig
RunnerClass = pipeBase.ButlerInitializedTaskRunner
_DefaultName = "forcedPhotCcd"
dataPrefix = ""

def __init__(self, butler=None, refSchema=None, initInputs=None, **kwds):
    super().__init__(**kwds)

    if initInputs is not None:
        refSchema = initInputs['inputSchema'].schema

    self.makeSubtask("references", butler=butler, schema=refSchema)
    if refSchema is None:
        refSchema = self.references.schema
    self.makeSubtask("measurement", refSchema=refSchema)
    # It is necessary to get the schema internal to the forced measurement task until such a time
    # that the schema is not owned by the measurement task, but is passed in by an external caller
    if self.config.doApCorr:
        self.makeSubtask("applyApCorr", schema=self.measurement.schema)
    self.makeSubtask('catalogCalculation', schema=self.measurement.schema)
    self.outputSchema = lsst.afw.table.SourceCatalog(self.measurement.schema)

def runQuantum(self, butlerQC, inputRefs, outputRefs):
    inputs = butlerQC.get(inputRefs)

    tract = butlerQC.quantum.dataId['tract']
    skyMap = inputs.pop("skyMap")
    inputs['refWcs'] = skyMap[tract].getWcs()

    inputs['refCat'] = self.mergeAndFilterReferences(inputs['exposure'], inputs['refCat'],
                                                     inputs['refWcs'])

    inputs['measCat'], inputs['exposureId'] = self.generateMeasCat(inputRefs.exposure.dataId,
                                                                   inputs['exposure'],
                                                                   inputs['refCat'], inputs['refWcs'],
                                                                   "visit_detector")
    self.attachFootprints(inputs['measCat'], inputs['refCat'], inputs['exposure'], inputs['refWcs'])
    # TODO: apply external calibrations (DM-17062)
    outputs = self.run(**inputs)
    butlerQC.put(outputs, outputRefs)

def mergeAndFilterReferences(self, exposure, refCats, refWcs):

# Step 1: Determine bounds of the exposure photometry will
# be performed on.
expWcs = exposure.getWcs()
expRegion = exposure.getBBox(lsst.afw.image.PARENT)
expBBox = lsst.geom.Box2D(expRegion)
expBoxCorners = expBBox.getCorners()
expSkyCorners = [expWcs.pixelToSky(corner).getVector() for
                 corner in expBoxCorners]
expPolygon = lsst.sphgeom.ConvexPolygon(expSkyCorners)

# Step 2: Filter out reference catalog sources that are
# not contained within the exposure boundaries, or whose
# parents are not within the exposure boundaries.  Note
# that within a single input refCat, the parents always
# appear before the children.
mergedRefCat = None
for refCat in refCats:
    refCat = refCat.get()
    if mergedRefCat is None:
        mergedRefCat = lsst.afw.table.SourceCatalog(refCat.table)
    containedIds = {0}  # zero as a parent ID means "this is a parent"
    for record in refCat:
        if expPolygon.contains(record.getCoord().getVector()) and record.getParent() in containedIds:
            record.setFootprint(record.getFootprint())
            mergedRefCat.append(record)
            containedIds.add(record.getId())
if mergedRefCat is None:
    raise RuntimeError("No reference objects for forced photometry.")
mergedRefCat.sort(lsst.afw.table.SourceTable.getParentKey())
return mergedRefCat

def generateMeasCat(self, exposureDataId, exposure, refCat, refWcs, idPackerName):

exposureIdInfo = ExposureIdInfo.fromDataId(exposureDataId, idPackerName)
idFactory = exposureIdInfo.makeSourceIdFactory()

measCat = self.measurement.generateMeasCat(exposure, refCat, refWcs,
                                           idFactory=idFactory)
return measCat, exposureIdInfo.expId

def runDataRef(self, dataRef, psfCache=None):

Definition at line 478 of file forcedPhotCcd.py.

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The documentation for this class was generated from the following file:

• /j/snowflake/release/lsstsw/stack/lsst-scipipe-0.7.0/Linux64/meas_base/22.0.1-19-g93a5c75+d23f2fb6d8/python/lsst/meas/base/forcedPhotCcd.py