ObjectSizeStarSelectorTask¶

ObjectSizeStarSelectorTask selects likely stars by looking for a cluster of small objects in a size-magnitude plot.

Python API summary¶

from lsst.meas.algorithms.objectSizeStarSelector import ObjectSizeStarSelectorTask

classObjectSizeStarSelectorTask(**kwargs): A star selector that looks for a cluster of small objects in a size-magnitude plot...

attributeconfig: Access configuration fields and retargetable subtasks.

methodrun(sourceCat, sourceSelectedField=None, matches=None, exposure=None): Select sources and return them...

Retargetable subtasks¶

No subtasks.

Configuration fields¶

badFlags¶

Default: ['base_PixelFlags_flag_edge', 'base_PixelFlags_flag_interpolatedCenter', 'base_PixelFlags_flag_saturatedCenter', 'base_PixelFlags_flag_crCenter', 'base_PixelFlags_flag_bad', 'base_PixelFlags_flag_interpolated']
Field type: str ListField

List of flags which cause a source to be rejected as bad

doFluxLimit¶

Default: True
Field type: bool Field

Apply flux limit to Psf Candidate selection?

doSignalToNoiseLimit¶

Default: False
Field type: bool Field

Apply signal-to-noise (i.e. flux/fluxErr) limit to Psf Candidate selection?

fluxMax¶

Default: 0.0
Field type: float Field

specify the maximum psfFlux for good Psf Candidates (ignored if == 0)

fluxMin¶

Default: 12500.0
Field type: float Field

specify the minimum psfFlux for good Psf Candidates

nSigmaClip¶

Default: 2.0
Field type: float Field

Keep objects within this many sigma of cluster 0’s median

signalToNoiseMax¶

Default: 0.0
Field type: float Field

specify the maximum signal-to-noise for good Psf Candidates (ignored if == 0)

signalToNoiseMin¶

Default: 50.0
Field type: float Field

specify the minimum signal-to-noise for good Psf Candidates (value should take into consideration the detection thresholds set for the catalog of interest)

sourceFluxField¶

Default: 'base_GaussianFlux_instFlux'
Field type: str Field

Name of field in Source to use for flux measurement

widthMax¶

Default: 10.0
Field type: float Field

maximum width to include in histogram

widthMin¶

Default: 0.0
Field type: float Field

minimum width to include in histogram

widthStdAllowed¶

Default: 0.15
Field type: float Field

Standard deviation of width allowed to be interpreted as good stars

Debugging¶

ObjectSizeStarSelectorTask has a debug dictionary with the following boolean keys:

display: bool; if True display debug information
displayExpsoure: bool; if True display the exposure and spatial cells
plotMagSize: bool; if True display the magnitude-size relation using matplotlib
dumpData: bool; if True dump data to a pickle file

More information can be found in lsstDebug.

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