DcrAssembleCoaddTask

Python API summary

from lsst.drp.tasks.dcr_assemble_coadd import DcrAssembleCoaddTask
classDcrAssembleCoaddTask(*args, **kwargs)

Assemble DCR coadded images from a set of warps...

attributeconfig

Access configuration fields and retargetable subtasks.

methodrun(skyInfo, warpRefList, imageScalerList, weightList, supplementaryData=None)

Assemble the coadd...

See also

See the DcrAssembleCoaddTask API reference for complete details.

Retargetable subtasks

assembleStaticSkyModel

Default

lsst.drp.tasks.assemble_coadd.AssembleCoaddTask

Field type

ConfigurableField

Task to assemble an artifact-free, PSF-matched Coadd to serve as a naive/first-iteration model of the static sky.

detect

Default

lsst.meas.algorithms.detection.SourceDetectionTask

Field type

ConfigurableField

Detect outlier sources on difference between each psfMatched warp and static sky model

detectPsfSources

Default

lsst.meas.algorithms.detection.SourceDetectionTask

Field type

ConfigurableField

Task to detect sources for PSF measurement, if doCalculatePsf is set.

detectTemplate

Default

lsst.meas.algorithms.detection.SourceDetectionTask

Field type

ConfigurableField

Detect sources on static sky model. Only used if doPreserveContainedBySource is True

inputMapper

Default

lsst.pipe.tasks.healSparseMapping.HealSparseInputMapTask

Field type

ConfigurableField

Input map creation subtask.

inputRecorder

Default

lsst.pipe.tasks.coaddInputRecorder.CoaddInputRecorderTask

Field type

ConfigurableField

Subtask that helps fill CoaddInputs catalogs added to the final Exposure

interpImage

Default

lsst.pipe.tasks.interpImage.InterpImageTask

Field type

ConfigurableField

Task to interpolate (and extrapolate) over NaN pixels

maskStreaks

Default

lsst.pipe.tasks.maskStreaks.MaskStreaksTask

Field type

ConfigurableField

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

lsst.pipe.tasks.measurePsf.MeasurePsfTask

Field type

ConfigurableField

Task to measure the PSF of the coadd, if doCalculatePsf is set.

measurePsfSources

Default

lsst.meas.base.sfm.SingleFrameMeasurementTask

Field type

ConfigurableField

Task to measure sources for PSF measurement, if doCalculatePsf is set.

modelPsf

Default

lsst.meas.algorithms.gaussianPsfFactory.applyWrapper

Field type

ConfigurableField

Model Psf factory

scaleWarpVariance

Default

lsst.meas.algorithms.scaleVariance.ScaleVarianceTask

Field type

ConfigurableField

Rescale variance on warps

scaleZeroPoint

Default

lsst.pipe.tasks.scaleZeroPoint.ScaleZeroPointTask

Field type

ConfigurableField

Task to adjust the photometric zero point of the coadd temp exposures

select

Default

lsst.pipe.tasks.selectImages.PsfWcsSelectImagesTask

Field type

ConfigurableField

Image selection subtask.

Configuration fields

accelerateModel

Default
3
Field type

float Field

Factor to amplify the differences between model planes by to speed convergence.

badMaskPlanes

Default
('NO_DATA',)
Field type

str ListField

Mask planes that, if set, the associated pixel should not be included in the coaddTempExp.

bandwidth

Default
None
Field type

float Field

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

Default
None
Field type

float Field (optional)

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

Default
'BRIGHT_OBJECT'
Field type

str Field

Name of mask bit used for bright objects

calcErrorFromInputVariance

Default
True
Field type

bool Field

Calculate coadd variance from input variance by stacking statistic. Passed to StatisticsControl.setCalcErrorFromInputVariance()

clipIter

Default
2
Field type

int Field

Number of iterations of outlier rejection; ignored if non-clipping statistic selected.

coaddName

Default
'deep'
Field type

str Field

Coadd name: typically one of deep or goodSeeing.

coaddPsf

Data type

lsst.meas.algorithms.CoaddPsfConfig

Field type

ConfigField

Configuration for CoaddPsf

connections

Data type

lsst.pipe.base.config.DcrAssembleCoaddConfigConnections

Field type

ConfigField

Configurations describing the connections of the PipelineTask to datatypes

convergenceMaskPlanes

Default
['DETECTED']
Field type

str ListField

Mask planes to use to calculate convergence.

convergenceThreshold

Default
0.001
Field type

float Field

Target relative change in convergence between iterations of forward modeling.

dcrNumSubfilters

Default
3
Field type

int Field

Number of sub-filters to forward model chromatic effects to fit the supplied exposures.

doAirmassWeight

Default
False
Field type

bool Field

Weight exposures by airmass? Useful if there are relatively few high-airmass observations.

doApplyExternalPhotoCalib

Default
False
Field type

bool Field

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

Default
False
Field type

bool Field

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

Default
False
Field type

bool Field

Attach a piecewise TransmissionCurve for the coadd? (requires all input Exposures to have TransmissionCurves).

doCalculatePsf

Default
False
Field type

bool Field

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

Default
False
Field type

bool Field

Filter artifact candidates based on morphological criteria, i.g. those that appear to be streaks.

doInputMap

Default
False
Field type

bool Field

Create a bitwise map of coadd inputs

doInterp

Default
True
Field type

bool Field

Interpolate over NaN pixels? Also extrapolate, if necessary, but the results are ugly.

doMaskBrightObjects

Default
False
Field type

bool Field

Set mask and flag bits for bright objects?

doNImage

Default
False
Field type

bool Field

Create image of number of contributing exposures for each pixel

doOnlineForMean

Default
False
Field type

bool Field

Perform online coaddition when statistic=”MEAN” to save memory?

doPrefilterArtifacts

Default
True
Field type

bool Field

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

Default
True
Field type

bool Field

Rescue artifacts from clipping that completely lie within a footprint detectedon the PsfMatched Template Coadd. Replicates a behavior of SafeClip.

doPsfMatch

Default
False
Field type

bool Field

Match to modelPsf? Sets makePsfMatched=True, makeDirect=False Deprecated: This field is no longer used. Will be removed after v26.

doScaleWarpVariance

Default
True
Field type

bool Field

Rescale Warp variance plane using empirical noise?

doSelectVisits

Default
False
Field type

bool Field

Coadd only visits selected by a SelectVisitsTask

doSigmaClip

Default
False
Field type

bool Field

Perform sigma clipped outlier rejection with MEANCLIP statistic? Deprecated: True

doUsePsfMatchedPolygons

Default
False
Field type

bool Field

Use ValidPolygons from shrunk Psf-Matched Calexps? Should be set to True by CompareWarp only.

doWrite

Default
True
Field type

bool Field

Persist coadd?

effectiveWavelength

Default
None
Field type

float Field

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

Default
5
Field type

float Field

Grow streak footprints by this number multiplied by the PSF width

hasFakes

Default
False
Field type

bool Field

Should be set to True if fake sources have been inserted into the input data.

imageInterpOrder

Default
1
Field type

int Field

The order of the spline interpolation used to shift the image plane.

includeCalibVar

Default
False
Field type

bool Field

Add photometric calibration variance to warp variance plane.

maskPropagationThresholds

Default
{'SAT': 0.1}
Field type

DictField

Key type

str

Value type

float

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

Default
21
Field type

int Field

Size in pixels of matching kernel. Must be odd.

maxFractionEpochsHigh

Default
0.03
Field type

float RangeField

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

float RangeField

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

Default
2
Field type

int Field

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

Default
None
Field type

int Field (optional)

Maximum number of iterations of forward modeling.

minNumIter

Default
None
Field type

int Field (optional)

Minimum number of iterations of forward modeling.

modelWeightsWidth

Default
3
Field type

float Field

Width of the region around detected sources to include in the DcrModel.

prefilterArtifactsMaskPlanes

Default
('NO_DATA', 'BAD', 'SAT', 'SUSPECT')
Field type

str ListField

Prefilter artifact candidates that are mostly covered by these bad mask planes.

prefilterArtifactsRatio

Default
0.05
Field type

float Field

Prefilter artifact candidates with less than this fraction overlapping good pixels

regularizationWidth

Default
2
Field type

int Field

Minimum radius of a region to include in regularization, in pixels.

regularizeModelFrequency

Default
4.0
Field type

float Field

Maximum relative change of the model allowed between subfilters. Set to zero to disable.

regularizeModelIterations

Default
2.0
Field type

float Field

Maximum relative change of the model allowed between iterations. Set to zero to disable.

removeMaskPlanes

Default
['NOT_DEBLENDED']
Field type

str ListField

Mask planes to remove before coadding

saveLogOutput

Default
True
Field type

bool Field

Flag to enable/disable saving of log output for a task, enabled by default.

saveMetadata

Default
True
Field type

bool Field

Flag to enable/disable metadata saving for a task, enabled by default. Deprecated: This field is deprecated and will be removed after v26.

sigmaClip

Default
3.0
Field type

float Field

Sigma for outlier rejection; ignored if non-clipping statistic selected.

spatialThreshold

Default
0.5
Field type

float RangeField

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

Default
True
Field type

bool Field

Calculate DCR for two evenly-spaced wavelengths in each subfilter. Instead of at the midpoint

splitThreshold

Default
0.1
Field type

float Field

Minimum DCR difference within a subfilter to use splitSubfilters, in pixels.Set to 0 to always split the subfilters.

statistic

Default
'MEANCLIP'
Field type

str Field

Main stacking statistic for aggregating over the epochs.

streakMaskName

Default
'STREAK'
Field type

str Field

Name of mask bit used for streaks

subregionSize

Default
(2000, 2000)
Field type

int ListField

Required length

2

Width, height of stack subregion size; make small enough that a full stack of images will fit into memory at once.

useConvergence

Default
True
Field type

bool Field

Use convergence test as a forward modeling end condition?If not set, skips calculating convergence and runs for maxNumIter iterations

useGlobalExternalPhotoCalib

Default
False
Field type

bool Field

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

Default
False
Field type

bool Field

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

Default
True
Field type

bool Field

Width of the region around detected sources to include in the DcrModel.

useProgressiveGain

Default
True
Field type

bool Field

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

Default
'direct'
Field type

str Field

Warp name: one of ‘direct’ or ‘psfMatched’