ForcedTransformedCentroidFromCoordPlugin

class lsst.meas.base.ForcedTransformedCentroidFromCoordPlugin(config, name, schemaMapper, metadata)

Bases: ForcedTransformedCentroidPlugin

Record the transformation of the reference catalog coord.

The coord recorded in the reference catalog is tranformed to the measurement coordinate system and stored.

Parameters

configForcedTransformedCentroidFromCoordConfig

Plugin configuration

namestr

Plugin name

schemaMapperlsst.afw.table.SchemaMapper

A mapping from reference catalog fields to output catalog fields. Output fields are added to the output schema.

metadatalsst.daf.base.PropertySet

Plugin metadata that will be attached to the output catalog.

Notes

This can be used as the slot centroid in forced measurement when only a reference coord exist, allowing subsequent measurements to simply refer to the slot value just as they would in single-frame measurement.

Methods Summary

measure(measRecord, exposure, refRecord, refWcs)

Measure the properties of a source given an image and a reference.

Methods Documentation

measure(measRecord, exposure, refRecord, refWcs)

Measure the properties of a source given an image and a reference.

Parameters

exposurelsst.afw.image.ExposureF

The pixel data to be measured, together with the associated PSF, WCS, etc. All other sources in the image should have been replaced by noise according to deblender outputs.

measRecordlsst.afw.table.SourceRecord

Record describing the object being measured. Previously-measured quantities will be retrieved from here, and it will be updated in-place with the outputs of this plugin.

refRecordlsst.afw.table.SimpleRecord

Additional parameters to define the fit, as measured elsewhere.

refWcslsst.afw.geom.SkyWcs or lsst.afw.geom.Angle

The coordinate system for the reference catalog values. An Angle may be passed, indicating that a local tangent WCS should be created for each object using the given angle as a pixel scale.

Notes

In the normal mode of operation, the source centroid will be set to the WCS-transformed position of the reference object, so plugins that only require a reference position should not have to access the reference object at all.