SingleFrameVeresTrailPlugin

class lsst.meas.extensions.trailedSources.SingleFrameVeresTrailPlugin(config, name, schema, metadata)

Bases: lsst.meas.base.SingleFramePlugin

Veres trailed source characterization plugin.

Measures the length, angle, flux, centroid, and end points of a trailed source using the Veres et al. 2012 model [1].

Parameters:

config: `SingleFrameNaiveTrailConfig`

Plugin configuration.

name: `str`

Plugin name.

schema: `lsst.afw.table.Schema`

Schema for the output catalog.

metadata: `lsst.daf.base.PropertySet`

Metadata to be attached to output catalog.

See also

lsst.meas.base.SingleFramePlugin

Notes

This plugin is designed to refine the measurements of trail length, angle, and end points from NaivePlugin, and of flux and centroid from previous measurement algorithms. Vereš et al. 2012 [1] derive a model for the flux in a given image pixel by convolving an axisymmetric Gaussian with a line. The model is parameterized by the total flux, trail length, angle from the x-axis, and the centroid. The best estimates are computed using a chi-squared minimization.

References

[1]	(1, 2) Vereš, P., et al. “Improved Asteroid Astrometry and Photometry with Trail Fitting” PASP, vol. 124, 2012.

Attributes Summary

APCORR_ORDER
CENTROID_ORDER
DEFAULT_CATALOGCALCULATION
FLUX_ORDER
SHAPE_ORDER
registry

Methods Summary

fail(measRecord[, error])	Record failure
getExecutionOrder()	Get the relative execution order of this plugin.
getLogName()
getTransformClass()	Get the measurement transformation appropriate to this plugin.
measure(measRecord, exposure)	Run the Veres trailed source measurement plugin.
measureN(measCat, exposure)	Measure the properties of blended sources on a single image.

Attributes Documentation

APCORR_ORDER = 3.0

CENTROID_ORDER = 0.0

DEFAULT_CATALOGCALCULATION = 4.0

FLUX_ORDER = 2.0

SHAPE_ORDER = 1.0

registry = <lsst.meas.base.pluginRegistry.PluginRegistry object>

Methods Documentation

fail(measRecord, error=None)

Record failure

See also

lsst.meas.base.SingleFramePlugin.fail

classmethod getExecutionOrder()

Get the relative execution order of this plugin.

Must be reimplemented as a class method by concrete derived classes.

getLogName()

static getTransformClass()

Get the measurement transformation appropriate to this plugin.

This returns a subclass of transforms.MeasurementTransform, which may be instantiated with details of the algorithm configuration and then called with information about calibration and WCS to convert from raw measurement quantities to calibrated units. Calibrated data is then provided in a separate output table.

Notes

By default, we copy everything from the input to the output without transformation.

measure(measRecord, exposure)

Run the Veres trailed source measurement plugin.

Parameters:

measRecord : lsst.afw.table.SourceRecord

Record describing the object being measured.

exposure : lsst.afw.image.Exposure

Pixel data to be measured.

See also

lsst.meas.base.SingleFramePlugin.measure

measureN(measCat, exposure)

Measure the properties of blended sources on a single image.

This operates on all members of a blend family at once. The image may be from a single epoch, or it may be a coadd.

Parameters:

measCat : lsst.afw.table.SourceCatalog

Catalog describing the objects (and only those objects) being measured. Previously-measured quantities will be retrieved from here, and it will be updated in-place with the outputs of this plugin.

exposure : lsst.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.

Notes

Derived classes that do not implement measureN should just inherit this disabled version. Derived classes that do implement measureN should additionally add a bool doMeasureN config field to their config class to signal that measureN-mode is available.