CalexpCutoutTask

class lsst.pipe.tasks.calexpCutout.CalexpCutoutTask(*, config: PipelineTaskConfig | None = None, log: logging.Logger | LsstLogAdapter | None = None, initInputs: dict[str, Any] | None = None, **kwargs: Any)

Bases: PipelineTask

Task for computing cutouts on a specific calexp given positions, xspans, and yspans of the stamps.

Methods Summary

run(in_table, calexp)

Compute and return the cutouts.

Methods Documentation

run(in_table, calexp)

Compute and return the cutouts.

Parameters

in_tableastropy.QTable

A table containing at least the following columns: position, xspan and yspan. The position should be an astropy.SkyCoord. The xspan and yspan are the extent of the cutout in x and y in pixels.

calexplsst.afw.image.ExposureF

The calibrated exposure from which to extract cutouts

Returns

outputlsst.pipe.base.Struct

A struct containing:

• cutouts: an lsst.meas.algorithms.Stamps object

  that wraps a list of masked images of the cutouts and a PropertyList containing the metadata to be persisted with the cutouts. The exposure metadata is preserved and, in addition, arrays holding the RA and Dec of each stamp in degrees are added to the metadata. Note: the origin of the output stamps is lsst.afw.image.PARENT.

• skipped_positions: a list of lsst.geom.SpherePoint objects for

  stamps that were skiped for being off the image or partially off the image

Raises

ValueError

If the input catalog doesn’t have the required columns, a ValueError is raised