PhotoCalTask

Python API summary

from lsst.pipe.tasks.photoCal import PhotoCalTask
classPhotoCalTask(refObjLoader, schema=None, **kwds)

Calculate an Exposure’s zero-point given a set of flux measurements of stars matched to an input catalogue...

attributeconfig

Access configuration fields and retargetable subtasks.

methodrun(exposure, sourceCat, expId=0)

Do photometric calibration - select matches to use and (possibly iteratively) compute the zero point...

See also

See the PhotoCalTask API reference for complete details.

Retargetable subtasks

reserve

Default

lsst.meas.algorithms.reserveSourcesTask.ReserveSourcesTask

Field type

ConfigurableField

Reserve sources from fitting

Configuration fields

applyColorTerms

Default
False
Field type

bool Field (optional)

Apply photometric color terms to reference stars? True: attempt to apply color terms; fail if color term data is not available for the specified reference catalog and filter. False: do not apply color terms.

colorterms

Data type

lsst.pipe.tasks.colorterms.ColortermLibrary

Field type

ConfigField

Library of photometric reference catalog name: color term dict (see also applyColorTerms).

fluxField

Default
'slot_CalibFlux_instFlux'
Field type

str Field

Name of the source instFlux field to use. The associated flag field (‘<name>_flags’) will be implicitly included in badFlags.

magErrFloor

Default
0.0
Field type

float RangeField

Range

[0.0,inf)

Additional magnitude uncertainty to be added in quadrature with measurement errors.

match

Data type

lsst.meas.astrom.directMatch.DirectMatchConfigWithoutLoader

Field type

ConfigField

Match to reference catalog

nIter

Default
20
Field type

int Field

number of iterations

nSigma

Default
3.0
Field type

float Field

clip at nSigma

photoCatName

Default
None
Field type

str Field (optional)

Name of photometric reference catalog; used to select a color term dict in colorterms. See also applyColorTerms.

sigmaMax

Default
0.25
Field type

float Field (optional)

maximum sigma to use when clipping

useMedian

Default
True
Field type

bool Field

use median instead of mean to compute zeropoint