GainCorrection¶

class lsst.ip.isr.GainCorrection(ampNames=[], gainAdjustments=[], **kwargs)¶

Bases: IsrCalib

Gain correction parameters.

Parameters:

ampNameslist [str]: List of amplifier names.
gainAdjustmentslist [float]: List of gain adjustment parameters.
**kwargs: Additional parameters.

Attributes Summary

`metadata`
`requiredAttributes`

Methods Summary

`apply`(target)	Method to apply the calibration to the target object.
`calibInfoFromDict`(dictionary)	Handle common keywords.
`correctGains`(gains[, exposure])	Correct a dictionary of gains (in place).
`determineCalibClass`(metadata, message)	Attempt to find calibration class in metadata.
`fromDetector`(detector)	Modify the calibration parameters to match the supplied detector.
`fromDict`(dictionary)	Construct a GainCorrection from a dictionary of properties.
`fromTable`(tableList)	Construct a calibration from a list of tables.
`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.
`setParameters`(*[, ampNames, gainAdjustments])	Set the parameters for the gain correction model.
`toDict`()	Return a dictionary containing the calibration properties.
`toTable`()	Construct a list of table(s) containing the GainCorrection data.
`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

metadata¶

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.

correctGains(gains, exposure=None)¶

Correct a dictionary of gains (in place).

Parameters:

gainsdict [str, float]: Array of gains to correct.
exposurelsst.afw.image.Exposure, optional: Exposure with additional metadata for correction.

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).

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)¶

Construct a GainCorrection from a dictionary of properties.

Parameters:

dictionarydict: Dictionary of properties.

Returns:

caliblsst.ip.isr.GainCorrection: Constructed calibration.

classmethod fromTable(tableList)¶

Construct a calibration from a list of tables.

Parameters:

tableListlist [astropy.table.Table]: List of table(s) to use to construct the GainCorrection.

Returns:

caliblsst.ip.isr.GainCorrection: The calibration defined in the table(s).

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.

setParameters(*, ampNames=[], gainAdjustments=[])¶

Set the parameters for the gain correction model.

Parameters:

ampNameslist [str]: List of amplifier names.
gainAdjustmentslist [float]: List of gain adjustment parameters.

toDict()¶

Return a dictionary containing the calibration properties.

Returns:

dictionarydict: Dictionary of properties.

toTable()¶

Construct a list of table(s) containing the GainCorrection data.

Returns:

tableListlist [astropy.table.Table]: List of tables containing the GainCorrection information.

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.

Navigation

GainCorrection¶