DcrAssembleCoaddTask¶
Python API summary¶
from lsst.drp.tasks.dcr_assemble_coadd import DcrAssembleCoaddTask
-
class
DcrAssembleCoaddTask(*args, **kwargs) Assemble DCR coadded images from a set of warps
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- attributeconfig
Access configuration fields and retargetable subtasks.
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method
run(skyInfo, warpRefList, imageScalerList, weightList, supplementaryData=None) Assemble the coadd
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See also
See the DcrAssembleCoaddTask API reference for complete details.
Retargetable subtasks¶
assembleStaticSkyModel¶
- Default
lsst.drp.tasks.assemble_coadd.AssembleCoaddTask- Field type
Task to assemble an artifact-free, PSF-matched Coadd to serve as a naive/first-iteration model of the static sky.
detect¶
- Default
- Field type
Detect outlier sources on difference between each psfMatched warp and static sky model
detectPsfSources¶
- Default
- Field type
Task to detect sources for PSF measurement, if doCalculatePsf is set.
detectTemplate¶
- Default
- Field type
Detect sources on static sky model. Only used if doPreserveContainedBySource is True
inputMapper¶
Input map creation subtask.
inputRecorder¶
Subtask that helps fill CoaddInputs catalogs added to the final Exposure
interpImage¶
- Default
- Field type
Task to interpolate (and extrapolate) over NaN pixels
maskStreaks¶
- Default
- Field type
Detect streaks on difference between each psfMatched warp and static sky model. Only used if doFilterMorphological is True. Adds a mask plane to an exposure, with the mask plane name set bystreakMaskName
measurePsf¶
- Default
- Field type
Task to measure the PSF of the coadd, if doCalculatePsf is set.
measurePsfSources¶
- Default
- Field type
Task to measure sources for PSF measurement, if doCalculatePsf is set.
modelPsf¶
- Default
lsst.meas.algorithms.gaussianPsfFactory.applyWrapper- Field type
Model Psf factory
scaleWarpVariance¶
- Default
lsst.meas.algorithms.scaleVariance.ScaleVarianceTask- Field type
Rescale variance on warps
scaleZeroPoint¶
- Default
- Field type
Task to adjust the photometric zero point of the coadd temp exposures
select¶
- Default
- Field type
Image selection subtask.
Configuration fields¶
accelerateModel¶
Factor to amplify the differences between model planes by to speed convergence.
badMaskPlanes¶
Mask planes that, if set, the associated pixel should not be included in the coaddTempExp.
bandwidth¶
Bandwidth of the physical filter, in nm.Required if transmission curves aren’t used.Support for using transmission curves is to be added in DM-13668.
baseGain¶
Relative weight to give the new solution vs. the last solution when updating the model.A value of 1.0 gives equal weight to both solutions.Small values imply slower convergence of the solution, but can help prevent overshooting and failures in the fit.If baseGain is None, a conservative gain will be calculated from the number of subfilters.
brightObjectMaskName¶
Name of mask bit used for bright objects
calcErrorFromInputVariance¶
Calculate coadd variance from input variance by stacking statistic. Passed to StatisticsControl.setCalcErrorFromInputVariance()
clipIter¶
Number of iterations of outlier rejection; ignored if non-clipping statistic selected.
coaddName¶
Coadd name: typically one of deep or goodSeeing.
coaddPsf¶
- Data type
lsst.meas.algorithms.CoaddPsfConfig- Field type
Configuration for CoaddPsf
connections¶
- Data type
lsst.pipe.base.config.DcrAssembleCoaddConfigConnections- Field type
Configurations describing the connections of the PipelineTask to datatypes
convergenceMaskPlanes¶
Mask planes to use to calculate convergence.
convergenceThreshold¶
Target relative change in convergence between iterations of forward modeling.
dcrNumSubfilters¶
Number of sub-filters to forward model chromatic effects to fit the supplied exposures.
doAirmassWeight¶
Weight exposures by airmass? Useful if there are relatively few high-airmass observations.
doApplyExternalPhotoCalib¶
Whether to apply external photometric calibration via an lsst.afw.image.PhotoCalib object. Uses the externalPhotoCalibName field to determine which calibration to load. Deprecated: Deprecated in favor of the ‘visitSummary’ connection. Will be removed after v26.
doApplyExternalSkyWcs¶
Whether to apply external astrometric calibration via an lsst.afw.geom.SkyWcs object. Uses externalSkyWcsName field to determine which calibration to load. Deprecated: Deprecated in favor of the ‘visitSummary’ connection. Will be removed after v26.
doAttachTransmissionCurve¶
Attach a piecewise TransmissionCurve for the coadd? (requires all input Exposures to have TransmissionCurves).
doCalculatePsf¶
Set to detect stars and recalculate the PSF from the final coadd.Otherwise the PSF is estimated from a selection of the best input exposures
doFilterMorphological¶
Filter artifact candidates based on morphological criteria, i.g. those that appear to be streaks.
doInputMap¶
Create a bitwise map of coadd inputs
doInterp¶
Interpolate over NaN pixels? Also extrapolate, if necessary, but the results are ugly.
doMaskBrightObjects¶
Set mask and flag bits for bright objects?
doNImage¶
Create image of number of contributing exposures for each pixel
doOnlineForMean¶
Perform online coaddition when statistic=”MEAN” to save memory?
doPrefilterArtifacts¶
Ignore artifact candidates that are mostly covered by the bad pixel mask, because they will be excluded anyway. This prevents them from contributing to the outlier epoch count image and potentially being labeled as persistant.’Mostly’ is defined by the config ‘prefilterArtifactsRatio’.
doPreserveContainedBySource¶
Rescue artifacts from clipping that completely lie within a footprint detectedon the PsfMatched Template Coadd. Replicates a behavior of SafeClip.
doPsfMatch¶
Match to modelPsf? Sets makePsfMatched=True, makeDirect=False Deprecated: This field is no longer used. Will be removed after v26.
doScaleWarpVariance¶
Rescale Warp variance plane using empirical noise?
doSelectVisits¶
Coadd only visits selected by a SelectVisitsTask
doSigmaClip¶
Perform sigma clipped outlier rejection with MEANCLIP statistic? Deprecated: True
doUsePsfMatchedPolygons¶
Use ValidPolygons from shrunk Psf-Matched Calexps? Should be set to True by CompareWarp only.
doWrite¶
Persist coadd?
effectiveWavelength¶
Effective wavelength of the filter, in nm.Required if transmission curves aren’t used.Support for using transmission curves is to be added in DM-13668.
growStreakFp¶
Grow streak footprints by this number multiplied by the PSF width
hasFakes¶
Should be set to True if fake sources have been inserted into the input data.
imageInterpOrder¶
The order of the spline interpolation used to shift the image plane.
includeCalibVar¶
Add photometric calibration variance to warp variance plane.
maskPropagationThresholds¶
Threshold (in fractional weight) of rejection at which we propagate a mask plane to the coadd; that is, we set the mask bit on the coadd if the fraction the rejected frames would have contributed exceeds this value.
matchingKernelSize¶
Size in pixels of matching kernel. Must be odd.
maxFractionEpochsHigh¶
- Default
0.03- Field type
- Range
[0.0,1.0)
Fraction of local number of epochs (N) to use as effective maxNumEpochs for high N. Effective maxNumEpochs = min(maxFractionEpochsLow * N, maxNumEpochs + maxFractionEpochsHigh * N)
maxFractionEpochsLow¶
- Default
0.4- Field type
- Range
[0.0,1.0)
Fraction of local number of epochs (N) to use as effective maxNumEpochs for low N. Effective maxNumEpochs = min(maxFractionEpochsLow * N, maxNumEpochs + maxFractionEpochsHigh * N)
maxNumEpochs¶
Charactistic maximum local number of epochs/visits in which an artifact candidate can appear and still be masked. The effective maxNumEpochs is a broken linear function of local number of epochs (N): min(maxFractionEpochsLow*N, maxNumEpochs + maxFractionEpochsHigh*N). For each footprint detected on the image difference between the psfMatched warp and static sky model, if a significant fraction of pixels (defined by spatialThreshold) are residuals in more than the computed effective maxNumEpochs, the artifact candidate is deemed persistant rather than transient and not masked.
maxNumIter¶
Maximum number of iterations of forward modeling.
minNumIter¶
Minimum number of iterations of forward modeling.
modelWeightsWidth¶
Width of the region around detected sources to include in the DcrModel.
prefilterArtifactsMaskPlanes¶
Prefilter artifact candidates that are mostly covered by these bad mask planes.
prefilterArtifactsRatio¶
Prefilter artifact candidates with less than this fraction overlapping good pixels
regularizationWidth¶
Minimum radius of a region to include in regularization, in pixels.
regularizeModelFrequency¶
Maximum relative change of the model allowed between subfilters. Set to zero to disable.
regularizeModelIterations¶
Maximum relative change of the model allowed between iterations. Set to zero to disable.
removeMaskPlanes¶
Mask planes to remove before coadding
saveLogOutput¶
Flag to enable/disable saving of log output for a task, enabled by default.
saveMetadata¶
Flag to enable/disable metadata saving for a task, enabled by default. Deprecated: This field is deprecated and will be removed after v26.
sigmaClip¶
Sigma for outlier rejection; ignored if non-clipping statistic selected.
spatialThreshold¶
- Default
0.5- Field type
- Range
[0.0,1.0]
Unitless fraction of pixels defining how much of the outlier region has to meet the temporal criteria. If 0, clip all. If 1, clip none.
splitSubfilters¶
Calculate DCR for two evenly-spaced wavelengths in each subfilter. Instead of at the midpoint
splitThreshold¶
Minimum DCR difference within a subfilter to use splitSubfilters, in pixels.Set to 0 to always split the subfilters.
statistic¶
Main stacking statistic for aggregating over the epochs.
streakMaskName¶
Name of mask bit used for streaks
subregionSize¶
Width, height of stack subregion size; make small enough that a full stack of images will fit into memory at once.
useConvergence¶
Use convergence test as a forward modeling end condition?If not set, skips calculating convergence and runs for maxNumIter iterations
useGlobalExternalPhotoCalib¶
When using doApplyExternalPhotoCalib, use ‘global’ calibrations that are not run per-tract. When False, use per-tract photometric calibration files. Deprecated: Deprecated in favor of the ‘visitSummary’ connection. Will be removed after v26.
useGlobalExternalSkyWcs¶
When using doApplyExternalSkyWcs, use ‘global’ calibrations that are not run per-tract. When False, use per-tract wcs files. Deprecated: Deprecated in favor of the ‘visitSummary’ connection. Will be removed after v26.
useModelWeights¶
Width of the region around detected sources to include in the DcrModel.
useProgressiveGain¶
Use a gain that slowly increases above baseGain to accelerate convergence? When calculating the next gain, we use up to 5 previous gains and convergence values.Can be set to False to force the model to change at the rate of baseGain.
warpType¶
Warp name: one of ‘direct’ or ‘psfMatched’