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

BasePsfDeterminerTask

Base class for PSF determiners

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.

MatcherSourceSelectorTask

Select sources that are useful for matching.

MeasureApCorrTask

Task to measure aperture correction

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 objects.

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)
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.
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.
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.
GaussianPsfFactory(*args, **kw)	Factory for simple Gaussian PSF models
ImageCurve(wavelength, efficiency, metadata)
ImagePsf
KernelPsf
LoadIndexedReferenceObjectsConfig(*args, ...)	Deprecated since version v25.0.
LoadIndexedReferenceObjectsTask(*args, **kwargs)	Stub of the LoadIndexedReferenceObjectsTask to allow retargeting before removal.
LoadReferenceObjectsConfig(*args, **kw)
LoadReferenceObjectsTask(*args, **kwargs)	Abstract gen2 base class to load objects from reference catalogs.
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.
MatcherSourceSelectorConfig(*args, **kw)
MatcherSourceSelectorTask(*args, **kwargs)	Select sources that are useful for matching.
MeasureApCorrConfig(*args, **kw)	Configuration for MeasureApCorrTask
MeasureApCorrTask(schema, **kwds)	Task to measure aperture correction
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.
ReferenceObjectLoaderBase(*args, **kwargs)	Stub of a deprecated class.
ReferenceSourceSelectorConfig(*args, **kw)
ReferenceSourceSelectorTask(**kwargs)	Reference source selector
RequireFiniteRaDec(*args, **kw)	Select sources that have finite RA and Dec sky coordinate values
RequireFlags(*args, **kw)	Select sources using flags
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
SignalToNoiseLimit(*args, **kw)	Select sources using a flux signal-to-noise limit
SingleGaussianPsf
SkyObjectsConfig(*args, **kw)	Configuration for generating sky objects
SkyObjectsTask([config, name, parentTask, log])	Generate a list of Footprints of sky objects.
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