lsst.meas.algorithms

The lsst.meas.algorithms module provides a variety of astronomical measurement algorithms.

LSST Reference Catalogs

• How to generate an LSST reference catalog
• LSST reference catalog schema description

Task reference

Tasks

AstrometrySourceSelectorTask

Select sources that are useful for astrometry.

BasePsfDeterminerTask

Base class for PSF determiners

BaseStarSelectorTask

Base class for star selectors

ConvertReferenceCatalogTask

Class for producing HTM-indexed reference catalogs from external catalog data.

DynamicDetectionTask

Detection of sources on an image with a dynamic threshold

FlaggedSourceSelectorTask

A trivial SourceSelector that simply uses an existing flag field to filter a SourceCatalog.

InstallGaussianPsfTask

Install a Gaussian PSF model in an exposure.

MakePsfCandidatesTask

Create PSF candidates given an input catalog.

MaskStreaksTask

Find streaks or other straight lines in image data.

MatcherSourceSelectorTask

Select sources that are useful for matching.

MeasureApCorrTask

Task to measure aperture correction.

NormalizedCalibrationFluxTask

Task to measure the normalized calibration flux.

ObjectSizeStarSelectorTask

A star selector that looks for a cluster of small objects in a size-magnitude plot.

PcaPsfDeterminerTask

A measurePsfTask psf estimator.

ReadFitsCatalogTask

Read an object catalog from a FITS table

ReadTextCatalogTask

Read an object catalog from a text file

ReferenceSourceSelectorTask

Reference source selector

ReserveSourcesTask

Reserve sources from analysis

ScienceSourceSelectorTask

Science source selector

SkyObjectsTask

Generate a list of Footprints of sky sources/objects (regions on the sky that do not otherwise have detections).

SourceDetectionTask

Detect peaks and footprints of sources in an image.

SubtractBackgroundTask

Subtract the background from an exposure

Pipeline tasks

No topics.

Script reference

• convertReferenceCatalog

Contributing

lsst.meas.algorithms is developed at https://github.com/lsst/meas_algorithms. You can find Jira issues for this module under the meas_algorithms component.

Python API reference

lsst.meas.algorithms Package

Functions

addExposures(exposureList)	Add a set of exposures together.
countPsfCandidates(psfCells[, nStarPerCell])
createKernelFromPsfCandidates(psfCells, ...)
findCosmicRays(image, psf, bkgd, policy[, keep])
fitKernelParamsToImage(kernel, image, pos)
fitKernelToImage(kernel, image, pos)
fitSpatialKernelFromPsfCandidates(*args, ...)	Overloaded function.
generateSkyObjects(mask, seed, config)	Generate a list of Footprints of sky objects
getRefFluxField(schema, filterName)	Get the name of a flux field from a schema.
getRefFluxKeys(schema, filterName)	Return keys for flux and flux error.
interpolateOverDefects(image, psf, badList)
legacyInterpolateOverDefects(image, psf, badList)
makeCoaddApCorrMap(catalog, coaddBox, coaddWcs)	Construct an ApCorrMap for a coadd
makeCoaddTransmissionCurve(coaddWcs, ...)
makePsfCandidate(source, image)
readFitsWithOptions(filename, stamp_factory, ...)	Read stamps from FITS file, allowing for only a subregion of the stamps to be read.
remove_signal_from_variance(exposure[, ...])	Removes the Poisson contribution from actual sources in the variance plane of an Exposure.
subtractPsf(psf, data, x, y[, psfFlux])
writeFits(filename, stamps, metadata, ...[, ...])	Write a single FITS file containing all stamps.

Classes

AccumulatorMeanStack(shape, bit_mask_value)	Stack masked images.
AmpCurve(amp_name_list, wavelength, ...)	Subclass of Curve that represents a curve per amp.
AstrometrySourceSelectorConfig(*args, **kw)
AstrometrySourceSelectorTask(*args, **kwargs)	Select sources that are useful for astrometry.
BasePsfDeterminerConfig(*args, **kw)	Configuration that is likely to be shared by all PSF determiners
BasePsfDeterminerTask(config[, schema])	Base class for PSF determiners
BaseSourceSelectorConfig(*args, **kw)
BaseSourceSelectorTask(**kwargs)	Base class for source selectors
BaseStarSelectorConfig(*args, **kw)
BaseStarSelectorTask(schema, **kwds)	Base class for star selectors
BrightStarStamp(stamp_im, gaiaGMag, gaiaId, ...)	Single stamp centered on a bright star, normalized by its annularFlux.
BrightStarStamps(starStamps[, innerRadius, ...])	Collection of bright star stamps and associated metadata.
CloughTocher2DInterpolatorUtils
CoaddBoundedField
CoaddBoundedFieldElement
CoaddPsf
CoaddPsfConfig(*args, **kw)
CoaddPsfControl
ColorLimit(*args, **kw)	Select sources using a color limit
ComputeNoiseCorrelationConfig(*args, **kw)
ComputeNoiseCorrelationTask(*args, **kwargs)	Compute the noise correlation coefficients in a MaskedImage
ConvertGaiaManager(*args, **kwargs)	Special-case convert manager to deal with Gaia fluxes.
ConvertGaiaXpManager(filenames, config, ...)	Special-case convert manager for Gaia XP spectrophotometry catalogs, that have fluxes/flux errors, instead of magnitudes/mag errors.
ConvertRefcatManager(filenames, config, ...)	Convert a reference catalog from external files into the LSST HTM sharded format, using a multiprocessing Pool to speed up the work.
ConvertReferenceCatalogConfig(*args, **kw)
ConvertReferenceCatalogTask(*[, output_dir])	Class for producing HTM-indexed reference catalogs from external catalog data.
CorrelationMatrix(array)	A class holding correlation coefficients for a set of background pixels.
Curve(wavelength, efficiency, metadata)	An abstract class to represent an arbitrary curve with interpolation.
DatasetConfig(*args, **kw)	Description of the on-disk storage format for the converted reference catalog.
Defect
DetectorCurve(wavelength, efficiency, metadata)	Subclass of Curve that represents a single curve per detector.
DoubleGaussianPsf
DynamicDetectionConfig(*args, **kw)	Configuration for DynamicDetectionTask
DynamicDetectionTask(*args, **kwargs)	Detection of sources on an image with a dynamic threshold
FindCosmicRaysConfig(*args, **kw)	Config for the findCosmicRays function
FlaggedSourceSelectorConfig(*args, **kw)
FlaggedSourceSelectorTask(**kwargs)	A trivial SourceSelector that simply uses an existing flag field to filter a SourceCatalog.
GaussianProcessTreegp([std, ...])	Gaussian Process Treegp class for Gaussian Process interpolation.
GaussianPsfFactory(*args, **kw)	Factory for simple Gaussian PSF models
ImageCurve(wavelength, efficiency, metadata)
ImagePsf
InterpolateOverDefectGaussianProcess(...[, ...])	InterpolateOverDefectGaussianProcess class performs Gaussian Process (GP) interpolation over defects in an image.
KernelPsf
LoadReferenceObjectsConfig(*args, **kw)
MagnitudeErrorLimit(*args, **kw)	Select sources using a magnitude error limit
MagnitudeLimit(*args, **kw)	Select sources using a magnitude limit
MakePsfCandidatesConfig(*args, **kw)
MakePsfCandidatesTask([config, name, ...])	Create PSF candidates given an input catalog.
MaskStreaksConfig(*args, **kw)	Configuration parameters for MaskStreaksTask.
MaskStreaksTask([config, name, parentTask, log])	Find streaks or other straight lines in image data.
MatcherSourceSelectorConfig(*args, **kw)
MatcherSourceSelectorTask(*args, **kwargs)	Select sources that are useful for matching.
MeasureApCorrConfig(*args, **kw)	Configuration for MeasureApCorrTask.
MeasureApCorrError(*, name, nSources, ndof)	Raised if Aperture Correction fails in a non-recoverable way.
MeasureApCorrTask(schema[, namesToCorrect])	Task to measure aperture correction.
NormalizedCalibrationFluxConfig(*args, **kw)	Configuration parameters for NormalizedCalibrationFluxTask.
NormalizedCalibrationFluxError(*, ...)	Raised if Aperture Correction fails in a non-recoverable way.
NormalizedCalibrationFluxTask(schema, **kwargs)	Task to measure the normalized calibration flux.
NullSourceSelectorTask(**kwargs)	Source selector that returns true for all sources.
ObjectSizeStarSelectorConfig(*args, **kw)
ObjectSizeStarSelectorTask(**kwargs)	A star selector that looks for a cluster of small objects in a size-magnitude plot.
PcaPsf
PcaPsfDeterminerConfig(*args, **kw)
PcaPsfDeterminerTask(config[, schema])	A measurePsfTask psf estimator.
PsfCandidateF
ReadFitsCatalogConfig(*args, **kw)
ReadFitsCatalogTask([config, name, ...])	Read an object catalog from a FITS table
ReadTextCatalogConfig(*args, **kw)
ReadTextCatalogTask([config, name, ...])	Read an object catalog from a text file
ReferenceObjectLoader(dataIds, refCats[, ...])	This class facilitates loading reference catalogs.
ReferenceSourceSelectorConfig(*args, **kw)
ReferenceSourceSelectorTask(**kwargs)	Reference source selector
ReinterpolatePixelsConfig(*args, **kw)	Config for ReinterpolatePixelsTask
ReinterpolatePixelsTask([config, name, ...])	Task to reinterpolate pixels
RequireFiniteRaDec(*args, **kw)	Select sources that have finite RA and Dec sky coordinate values
RequireFlags(*args, **kw)	Select sources using flags
RequirePrimary(*args, **kw)	Select sources that have the detect_isPrimary flag set.
RequireUnresolved(*args, **kw)	Select sources using star/galaxy separation
ReserveSourcesConfig(*args, **kw)	Configuration for reserving sources
ReserveSourcesTask([columnName, schema, doc])	Reserve sources from analysis
ScaleVarianceConfig(*args, **kw)
ScaleVarianceTask(*args, **kwargs)	Scale the variance in a MaskedImage
ScienceSourceSelectorConfig(*args, **kw)	Configuration for selecting science sources
ScienceSourceSelectorTask(**kwargs)	Science source selector
SetPrimaryFlagsConfig(*args, **kw)
SetPrimaryFlagsTask(*, schema[, isSingleFrame])	Set the isPrimary flag and either various blendedness, or patch/tract flags to a catalog (for single frame or coadd catalogs, respectively), based on other properties of the sources.
SignalToNoiseLimit(*args, **kw)	Select sources using a flux signal-to-noise limit
SingleGaussianPsf
SkyObjectsConfig(*args, **kw)	Configuration for generating sky objects
SkyObjectsTask([schema])	Generate a list of Footprints of sky sources/objects (regions on the sky that do not otherwise have detections).
SourceDetectionConfig(*args, **kw)	Configuration parameters for the SourceDetectionTask
SourceDetectionTask([schema])	Detect peaks and footprints of sources in an image.
Stamp(stamp_im, archive_element, position)	Single stamp.
Stamps(stamps[, metadata, use_mask, ...])
StampsBase(stamps[, metadata, use_mask, ...])	Collection of stamps and associated metadata.
SubtractBackgroundConfig(*args, **kw)	Config for SubtractBackgroundTask
SubtractBackgroundTask([config, name, ...])	Subtract the background from an exposure
WarpedPsf