FgcmMakeLutTask¶

FgcmMakeLutTask computes a look-up table tracking atmosphere and instrumental variations for use in the fgcmcal fits. The intention is that this is run once for a given observatory/instrument and should only be updated when instrumental parameters change (e.g., updated filter and ccd throughput curves), or in the extremely rare case if an observatory is relocated to a different elevation or latitude.

This is the first task in a typical fgcmcal processing chain. The second is FgcmBuildFromIsolatedStarsTask, the third is FgcmFitCycleTask, and the fourth is FgcmOutputProductsTask.

Processing summary¶

FgcmMakeLutTask uses an input atmosphere table (preferable) or a list of atmosphere parameters, combined with the instrumental throughput as a function of position, to compute a look-up table used in the fgcmcal fits.

Python API summary¶

from lsst.fgcmcal.fgcmMakeLut import FgcmMakeLutTask

classFgcmMakeLutTask(initInputs=None, **kwargs): Make Look-Up Table for FGCM...

attributeconfig: Access configuration fields and retargetable subtasks.

methodrun(**kwargs): Run task algorithm on in-memory data...

Retargetable subtasks¶

No subtasks.

Configuration fields¶

atmosphereTableName¶

Default: None
Field type: str Field (optional)

FGCM name or filename of precomputed atmospheres

connections¶

Data type: lsst.pipe.base.config.FgcmMakeLutConfigConnections
Field type: ConfigField

Configurations describing the connections of the PipelineTask to datatypes

doOpticsTransmission¶

Default: True
Field type: bool Field

Include optics transmission?

doSensorTransmission¶

Default: True
Field type: bool Field

Include sensor transmission?

parameters¶

Data type: lsst.fgcmcal.fgcmMakeLut.FgcmMakeLutParametersConfig
Field type: ConfigField

Atmosphere parameters (required if no atmosphereTableName)

physicalFilters¶

Default: []
Field type: str ListField

List of physicalFilter labels to generate look-up table.

saveLogOutput¶

Default: True
Field type: bool Field

Flag to enable/disable saving of log output for a task, enabled by default.

sensorCorrectionTermDict¶

Default: {}
Field type: ConfigDictField
Key type: str
Value type: lsst.fgcmcal.fgcmMakeLut.SensorCorrectionTerms

Mapping of filter name to sensor correction terms.

stdPhysicalFilterOverrideMap¶

Default: {}
Field type: DictField
Key type: str
Value type: str

Override mapping from physical filter labels to ‘standard’ physical filter labels. The ‘standard’ physical filter defines the transmission curve that the FGCM standard bandpass will be based on. Any filter not listed here will be mapped to itself (e.g. g->g or HSC-G->HSC-G). Use this override for cross-filter calibration such as HSC-R->HSC-R2 and HSC-I->HSC-I2.

Examples¶

See the cookbook for worked examples.

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