PcaPsfDeterminerTask¶

PcaPsfDeterminerTask estimates PSFs of pre-selected likely stars using a PCA decomposition approach.

Python API summary¶

from lsst.meas.algorithms.pcaPsfDeterminer import PcaPsfDeterminerTask

classPcaPsfDeterminerTask(config, schema=None, **kwds): A measurePsfTask psf estimator...

attributeconfig: Access configuration fields and retargetable subtasks.

Retargetable subtasks¶

No subtasks.

Configuration fields¶

borderWidth¶

Default: 0
Field type: int Field

Number of pixels to ignore around the edge of PSF candidate postage stamps

constantWeight¶

Default: True
Field type: bool Field

Should each PSF candidate be given the same weight, independent of magnitude?

doMaskBlends¶

Default: True
Field type: bool Field

Mask blends in image?

doRejectBlends¶

Default: False
Field type: bool Field

Reject candidates that are blended?

kernelSize¶

Default: 10.0
Field type: float Field

radius of the kernel to create, relative to the square root of the stellar quadrupole moments

kernelSizeMax¶

Default: 45
Field type: int Field

Maximum radius of the kernel

kernelSizeMin¶

Default: 25
Field type: int Field

Minimum radius of the kernel

lam¶

Default: 0.05
Field type: float Field

floor for variance is lam*data

nEigenComponents¶

Default: 4
Field type: int Field

number of eigen components for PSF kernel creation

nIterForPsf¶

Default: 3
Field type: int Field

number of iterations of PSF candidate star list

nStarPerCell¶

Default: 3
Field type: int Field

number of stars per psf cell for PSF kernel creation

nStarPerCellSpatialFit¶

Default: 5
Field type: int Field

number of stars per psf Cell for spatial fitting

nonLinearSpatialFit¶

Default: False
Field type: bool Field

Use non-linear fitter for spatial variation of Kernel

pixelThreshold¶

Default: 0.0
Field type: float Field

Threshold (stdev) for rejecting extraneous pixels around candidate; applied if positive

reducedChi2ForPsfCandidates¶

Default: 2.0
Field type: float Field

for psf candidate evaluation

sizeCellX¶

Default: 256
Field type: int Field

size of cell used to determine PSF (pixels, column direction)

sizeCellY¶

Default: 256
Field type: int Field

size of cell used to determine PSF (pixels, row direction)

spatialOrder¶

Default: 2
Field type: int Field

specify spatial order for PSF kernel creation

spatialReject¶

Default: 3.0
Field type: float Field

Rejection threshold (stdev) for candidates based on spatial fit

tolerance¶

Default: 0.01
Field type: float Field

tolerance of spatial fitting

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