Glossary and Acronyms

This table contains useful definitions of any Roman specific terms and acronyms.

Term	Definition
ASDF	Advanced Scientific Data Format The format and its implications for Roman are discussed in the ASDF Information article.
CGI	Roman Coronagraph Instrument This instrument is officially referred to as "the Coronagraph", but the older acronym, CGI, persists in some contexts.
CRDS	Calibration Reference Data System
IPAC	Infrared Processing and Analysis Center
ETC	Exposure Time Calculator
EWA	Element Wheel Assembly
FPA	Focal Plane Array
FPS	Focal Plane System
JDox	JDox refers to the JWST Documentation.
Level 1 (L1) data products	Level 1 refers to the uncalibrated "raw" individual exposures for each detector, which consist of raw pixel information formatted into the shape of the detector. These data contain all instrumental effects. For more context, see the Data Levels and Products article.
Level 2 (L2) data products	Level 2 refers to the "calibrated" individual exposures for each detector that are corrected for instrument artifacts. Level 2 (L2) data have appropriate astrometric and geometric distortion information attached and, with the exception of Grism and Prism data, are transformed into units that have a known scaling with flux. Data arrays with both uncertainties and the data quality are provided. For more context, see the Data Levels and Products article.
MAST	Mikulski Archive for Space Telescopes
Ramp	Ramp refers to a three-dimensional data array containing the signal as a function of time that was measured using non-destructive reads of a detector.
RAUG	Roman APT User's Guide
RCS	Relative Calibration System
Resultant	A science image output generated from one or more detector reads.
romancal	romancal is a python package that contains the calibration software for the WFI instrument. For more context, see the .Roman STScI Data Pipelines v2023B article.
SCA	Sensor Chip Assembly
Science Platform	A computing environment hosted by the SOC that allows users to customize science data analysis with SOC software, user custom software, user custom data, and local access to the data archived in the cloud.
STIPS	Space Telescope Imaging Product Simulator
STScI	Space Telescope Science Institute
WFI	Wide Field Instrument
YAML	YAML Ain't Markup Language YAML is a data-serialization language that is used to store meta data in ASDF files and to input configurations for some software. For more context, refer to the WFI Data Format section of the Data Handbook.

For additional questions not answered in this article, please contact the Roman Help Desk at STScI.