StrayLightData

class lsst.ip.isr.StrayLightData(camera=None, detector=None, log=None, **kwargs)

Bases: IsrCalib

An abstract base class for rotator-dependent stray light information.

Attributes Summary

requiredAttributes

Methods Summary

apply(target)	Method to apply the calibration to the target object.
calibInfoFromDict(dictionary)	Handle common keywords.
determineCalibClass(metadata, message)	Attempt to find calibration class in metadata.
evaluate(angle_start[, angle_end])	Get a stray light array for a range of rotator angles.
fromDetector(detector)	Modify the calibration parameters to match the supplied detector.
fromDict(dictionary, **kwargs)	Construct a calibration from a dictionary of properties.
fromTable(tableList, **kwargs)	Construct a calibration from a dictionary of properties.
getMetadata()	Retrieve metadata associated with this calibration.
readFits(filename, **kwargs)	Read calibration data from a FITS file.
readText(filename, **kwargs)	Read calibration representation from a yaml/ecsv file.
setMetadata(metadata)	Store a copy of the supplied metadata with this calibration.
toDict()	Return a dictionary containing the calibration properties.
toTable()	Return a list of tables containing the calibration properties.
updateMetadata([camera, detector, ...])	Update metadata keywords with new values.
updateMetadataFromExposures(exposures)	Extract and unify metadata information.
validate([other])	Validate that this calibration is defined and can be used.
writeFits(filename)	Write calibration data to a FITS file.
writeText(filename[, format])	Write the calibration data to a text file.

Attributes Documentation

requiredAttributes

Methods Documentation

apply(target)

Method to apply the calibration to the target object.

Parameters:

targetobject

Thing to validate against.

Returns:

validbool

Returns true if the calibration was applied correctly.

Raises:

NotImplementedError

Raised if not implemented.

calibInfoFromDict(dictionary)

Handle common keywords.

This isn’t an ideal solution, but until all calibrations expect to find everything in the metadata, they still need to search through dictionaries.

Parameters:

dictionarydict or lsst.daf.base.PropertyList

Source for the common keywords.

Raises:

RuntimeError

Raised if the dictionary does not match the expected OBSTYPE.

classmethod determineCalibClass(metadata, message)

Attempt to find calibration class in metadata.

Parameters:

metadatadict or lsst.daf.base.PropertyList

Metadata possibly containing a calibration class entry.

messagestr

Message to include in any errors.

Returns:

calibClassobject

The class to use to read the file contents. Should be an lsst.ip.isr.IsrCalib subclass.

Raises:

ValueError

Raised if the resulting calibClass is the base lsst.ip.isr.IsrClass (which does not implement the content methods).

abstract evaluate(angle_start: Angle, angle_end: Angle | None = None)

Get a stray light array for a range of rotator angles.

Parameters:

angle_beginfloat

Instrument rotation angle at the start of the exposure.

angle_endfloat, optional

Instrument rotation angle at the end of the exposure. If not provided, the returned array will reflect a snapshot at angle_start.

Returns:

arraynumpy.ndarray

A stray-light background image for this exposure.

fromDetector(detector)

Modify the calibration parameters to match the supplied detector.

Parameters:

detectorlsst.afw.cameraGeom.Detector

Detector to use to set parameters from.

Raises:

NotImplementedError

Raised if not implemented by a subclass. This needs to be implemented by subclasses for each calibration type.

classmethod fromDict(dictionary, **kwargs)

Construct a calibration from a dictionary of properties.

Must be implemented by the specific calibration subclasses.

Parameters:

dictionarydict

Dictionary of properties.

kwargsdict or collections.abc.Mapping`, optional

Set of key=value options.

Returns:

caliblsst.ip.isr.CalibType

Constructed calibration.

Raises:

NotImplementedError

Raised if not implemented.

classmethod fromTable(tableList, **kwargs)

Construct a calibration from a dictionary of properties.

Must be implemented by the specific calibration subclasses.

Parameters:

tableListlist [lsst.afw.table.Table]

List of tables of properties.

kwargsdict or collections.abc.Mapping`, optional

Set of key=value options.

Returns:

caliblsst.ip.isr.CalibType

Constructed calibration.

Raises:

NotImplementedError

Raised if not implemented.

getMetadata()

Retrieve metadata associated with this calibration.

Returns:

metalsst.daf.base.PropertyList

Metadata. The returned PropertyList can be modified by the caller and the changes will be written to external files.

classmethod readFits(filename, **kwargs)

Read calibration data from a FITS file.

Parameters:

filenamestr

Filename to read data from.

kwargsdict or collections.abc.Mapping`, optional

Set of key=value pairs to pass to the fromTable method.

Returns:

caliblsst.ip.isr.IsrCalib

Calibration contained within the file.

classmethod readText(filename, **kwargs)

Read calibration representation from a yaml/ecsv file.

Parameters:

filenamestr

Name of the file containing the calibration definition.

kwargsdict or collections.abc.Mapping`, optional

Set of key=value pairs to pass to the fromDict or fromTable methods.

Returns:

calibIsrCalibType

Calibration class.

Raises:

RuntimeError

Raised if the filename does not end in “.ecsv” or “.yaml”.

setMetadata(metadata)

Store a copy of the supplied metadata with this calibration.

Parameters:

metadatalsst.daf.base.PropertyList

Metadata to associate with the calibration. Will be copied and overwrite existing metadata.

toDict()

Return a dictionary containing the calibration properties.

The dictionary should be able to be round-tripped through fromDict.

Returns:

dictionarydict

Dictionary of properties.

Raises:

NotImplementedError

Raised if not implemented.

toTable()

Return a list of tables containing the calibration properties.

The table list should be able to be round-tripped through fromDict.

Returns:

tableListlist [lsst.afw.table.Table]

List of tables of properties.

Raises:

NotImplementedError

Raised if not implemented.

updateMetadata(camera=None, detector=None, filterName=None, setCalibId=False, setCalibInfo=False, setDate=False, **kwargs)

Update metadata keywords with new values.

Parameters:

cameralsst.afw.cameraGeom.Camera, optional

Reference camera to use to set _instrument field.

detectorlsst.afw.cameraGeom.Detector, optional

Reference detector to use to set _detector* fields.

filterNamestr, optional

Filter name to assign to this calibration.

setCalibIdbool, optional

Construct the _calibId field from other fields.

setCalibInfobool, optional

Set calibration parameters from metadata.

setDatebool, optional

Ensure the metadata CALIBDATE fields are set to the current datetime.

kwargsdict or collections.abc.Mapping, optional

Set of key=value pairs to assign to the metadata.

updateMetadataFromExposures(exposures)

Extract and unify metadata information.

Parameters:

exposureslist

Exposures or other calibrations to scan.

validate(other=None)

Validate that this calibration is defined and can be used.

Parameters:

otherobject, optional

Thing to validate against.

Returns:

validbool

Returns true if the calibration is valid and appropriate.

writeFits(filename)

Write calibration data to a FITS file.

Parameters:

filenamestr

Filename to write data to.

Returns:

usedstr

The name of the file used to write the data.

writeText(filename, format='auto')

Write the calibration data to a text file.

Parameters:

filenamestr

Name of the file to write.

formatstr

Format to write the file as. Supported values are:

"auto" : Determine filetype from filename. "yaml" : Write as yaml. "ecsv" : Write as ecsv.

Returns:

usedstr

The name of the file used to write the data. This may differ from the input if the format is explicitly chosen.

Raises:

RuntimeError

Raised if filename does not end in a known extension, or if all information cannot be written.

Notes

The file is written to YAML/ECSV format and will include any associated metadata.