calwebb_dark: Dark Processing

Class

jwst.pipeline.DarkPipeline

Alias

calwebb_dark

The DarkPipeline applies basic detector-level corrections to all dark exposures. It is identical to the calwebb_detector1 pipeline, except that it stops processing immediately before the dark_current step. The list of steps is shown below. As with the calwebb_detector1 pipeline, the order of steps is a bit different for MIRI exposures.

Near-IR	MIRI
group_scale	group_scale
dq_init	dq_init
saturation	saturation
ipc 1	ipc
superbias	firstframe
refpix	lastframe
linearity	reset
	linearity
	rscd

1

By default, the parameter reference pars-darkpipeline retrieved from CRDS will skip the ipc step.

Arguments

The calwebb_dark pipeline has no optional arguments.

Inputs

4D raw data

Data model

RampModel

File suffix

_uncal

The input to DarkPipeline is a single raw dark exposure, which contains the original raw data from all of the detector readouts in the exposure (ncols x nrows x ngroups x nintegrations).

Outputs

4D corrected ramp

Data model

RampModel

File suffix

_dark

Result of applying all pipeline steps listed above. Will have the same data dimensions as the input raw 4D data (ncols x nints x ngroups x nints).

PARS-DARKPIPELINE Reference File

REFTYPE

PARS-DARKPIPELINE

Data model

N/A

Reference Selection Keywords

CRDS selects appropriate pars-whitelightstep references based on the following keywords.

Instrument	Keywords
FGS	INSTRUME
MIRI	INSTRUME
NIRCAM	INSTRUME
NIRISS	INSTRUME
NIRSPEC	INSTRUME

Standard Keywords

The following table lists the keywords that are required to be present in all reference files. The first column gives the FITS keyword names. The second column gives the jwst data model name for each keyword, which is useful when using data models in creating and populating a new reference file. The third column gives the equivalent meta tag in ASDF reference file headers, which is the same as the name within the data model meta tree (second column).

FITS Keyword	Data Model Name	ASDF meta tag
AUTHOR	model.meta.author	author
DATAMODL	model.meta.model_type	model_type
DATE	model.meta.date	date
DESCRIP	model.meta.description	description
FILENAME	model.meta.filename	N/A
INSTRUME	model.meta.instrument.name	instrument: {name}
PEDIGREE	model.meta.pedigree	pedigree
REFTYPE	model.meta.reftype	reftype
TELESCOP	model.meta.telescope	telescope
USEAFTER	model.meta.useafter	useafter

NOTE: More information on standard required keywords can be found here: Standard Required Keywords