DeferredChargeCalib¶
- class lsst.ip.isr.DeferredChargeCalib(useGains=True, **kwargs)¶
Bases:
IsrCalib
Calibration containing deferred charge/CTI parameters.
- Parameters:
- **kwargs
Additional parameters to pass to parent constructor.
Notes
The charge transfer inefficiency attributes stored are:
- driftScale
dict
[str
,float
] A dictionary, keyed by amplifier name, of the local electronic offset drift scale parameter, A_L in Snyder+2021.
- decayTime
dict
[str
,float
] A dictionary, keyed by amplifier name, of the local electronic offset decay time, tau_L in Snyder+2021.
- globalCti
dict
[str
,float
] A dictionary, keyed by amplifier name, of the mean global CTI paramter, b in Snyder+2021.
- serialTraps
dict
[str
,lsst.ip.isr.SerialTrap
] A dictionary, keyed by amplifier name, containing a single serial trap for each amplifier.
Attributes Summary
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.
fromDetector
(detector)Read metadata parameters from a detector.
fromDict
(dictionary)Construct a calibration from a dictionary of properties.
fromTable
(tableList)Construct calibration from a list of tables.
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
()Construct a list of tables containing the information in this calibration.
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.
- 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:
- dictionary
dict
orlsst.daf.base.PropertyList
Source for the common keywords.
- dictionary
- Raises:
- RuntimeError
Raised if the dictionary does not match the expected OBSTYPE.
- classmethod determineCalibClass(metadata, message)¶
Attempt to find calibration class in metadata.
- Parameters:
- Returns:
- calibClass
object
The class to use to read the file contents. Should be an
lsst.ip.isr.IsrCalib
subclass.
- calibClass
- Raises:
- ValueError
Raised if the resulting calibClass is the base
lsst.ip.isr.IsrClass
(which does not implement the content methods).
- fromDetector(detector)¶
Read metadata parameters from a detector.
- Parameters:
- detector
lsst.afw.cameraGeom.detector
Input detector with parameters to use.
- detector
- Returns:
- calib
lsst.ip.isr.Linearizer
The calibration constructed from the detector.
- calib
- classmethod fromDict(dictionary)¶
Construct a calibration from a dictionary of properties.
- Parameters:
- dictionary
dict
Dictionary of properties.
- dictionary
- Returns:
- calib
lsst.ip.isr.CalibType
Constructed calibration.
- calib
- Raises:
- RuntimeError
Raised if the supplied dictionary is for a different calibration.
- classmethod fromTable(tableList)¶
Construct calibration from a list of tables.
This method uses the
fromDict
method to create the calibration, after constructing an appropriate dictionary from the input tables.- Parameters:
- tableList
list
[lsst.afw.table.Table
] List of tables to use to construct the crosstalk calibration. Two tables are expected in this list, the first containing the per-amplifier CTI parameters, and the second containing the parameters for serial traps.
- tableList
- Returns:
- calib
lsst.ip.isr.DeferredChargeCalib
The calibration defined in the tables.
- calib
- Raises:
- ValueError
Raised if the trap type or trap coefficients are not defined properly.
- getMetadata()¶
Retrieve metadata associated with this calibration.
- Returns:
- meta
lsst.daf.base.PropertyList
Metadata. The returned
PropertyList
can be modified by the caller and the changes will be written to external files.
- meta
- classmethod readFits(filename, **kwargs)¶
Read calibration data from a FITS file.
- Parameters:
- Returns:
- calib
lsst.ip.isr.IsrCalib
Calibration contained within the file.
- calib
- classmethod readText(filename, **kwargs)¶
Read calibration representation from a yaml/ecsv file.
- Parameters:
- Returns:
- calib
IsrCalibType
Calibration class.
- calib
- 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:
- metadata
lsst.daf.base.PropertyList
Metadata to associate with the calibration. Will be copied and overwrite existing metadata.
- metadata
- toDict()¶
Return a dictionary containing the calibration properties. The dictionary should be able to be round-tripped through
fromDict
.- Returns:
- dictionary
dict
Dictionary of properties.
- dictionary
- toTable()¶
Construct a list of tables containing the information in this calibration.
The list of tables should create an identical calibration after being passed to this class’s fromTable method.
- Returns:
- tableList
list
[lsst.afw.table.Table
] List of tables containing the crosstalk calibration information. Two tables are generated for this list, the first containing the per-amplifier CTI parameters, and the second containing the parameters for serial traps.
- tableList
- updateMetadata(camera=None, detector=None, filterName=None, setCalibId=False, setCalibInfo=False, setDate=False, **kwargs)¶
Update metadata keywords with new values.
- Parameters:
- camera
lsst.afw.cameraGeom.Camera
, optional Reference camera to use to set
_instrument
field.- detector
lsst.afw.cameraGeom.Detector
, optional Reference detector to use to set
_detector*
fields.- filterName
str
, optional Filter name to assign to this calibration.
- setCalibId
bool
, optional Construct the
_calibId
field from other fields.- setCalibInfo
bool
, optional Set calibration parameters from metadata.
- setDate
bool
, optional Ensure the metadata
CALIBDATE
fields are set to the current datetime.- kwargs
dict
orcollections.abc.Mapping
, optional Set of
key=value
pairs to assign to the metadata.
- camera
- updateMetadataFromExposures(exposures)¶
Extract and unify metadata information.
- Parameters:
- exposures
list
Exposures or other calibrations to scan.
- exposures
- validate(other=None)¶
Validate that this calibration is defined and can be used.
- writeFits(filename)¶
Write calibration data to a FITS file.
- writeText(filename, format='auto')¶
Write the calibration data to a text file.
- Parameters:
- Returns:
- used
str
The name of the file used to write the data. This may differ from the input if the format is explicitly chosen.
- used
- 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.