READNOISE reference file

REFTYPE:

READNOISE

Data model:

ReadnoiseRefModel

The READNOISE reference file contains a pixel-by-pixel map of readnoise, which is used in estimating the expected noise in each pixel.

Reference Selection Keywords for READNOISE

CRDS selects appropriate READNOISE references based on the following keywords. READNOISE is not applicable for instruments not in the table. All keywords used for file selection are required.

Instrument	Keywords
WFI	instrument, detector, date, time

Standard ASDF metadata

The following table lists the attributes that are required to be present in all reference files. The first column shows the attribute in the ASDF reference file headers, which is the same as the name within the data model meta tree (second column). The second column gives the roman data model name for each attribute, which is useful when using data models in creating and populating a new reference file.

Attribute	Fully Qualified Path
author	model.meta.author
model_type	model.meta.model_type
date	model.meta.date
description	model.meta.description
instrument	model.meta.instrument.name
reftype	model.meta.reftype
telescope	model.meta.telescope
useafter	model.meta.useafter

NOTE: More information on standard required attributes can be found here: Standard ASDF metadata

Type Specific Keyword Attributes for READNOISE

In addition to the standard reference file keyword attributes listed above, the following keyword attributess are required in READNOISE reference files, because they are used as CRDS selectors (see Reference Selection Keywords for READNOISE):

Keyword Attr.	Fully qualified path	Instruments
detector	model.meta.wfi_mode.detector	WFI

Reference File Format

READNOISE reference files are asdf files with a single data array.

Data	Array Type	Dimensions	Data type
data	NDArray	4096 x 4096	float32

The ASDF file contains a single data array.