Processing Levels and Product Stages

Here we describe the structure and content of the most frequently used forms of files for Roman science data products, which are in ASDF format. Each type of ASDF file is the result of serialization of a corresponding DataModel.

Within the various STScI internal data processing and archiving systems that are used for routine processing of Roman data, there are some different uses of terminology to refer to different levels of processing. The WFI data is converted into ASDF files by Science Data Formatting (SDF), level 0. SDF also inserts data from the engineering database and from the proposal database to create the level 1 files. SDF produces one ASDF file per detector and exposure and these level 1 files are used as input to the Exposure Level Processing. The output of the exposure level processing is a level 2 file.

Data Processing Levels	User Data Product Stages	Input data level
Level 0, Raw files	Exposure data in an ASDF file	Uncalibrated
Level 1, Exposure Level Processing	Fully populated ASDF file	Uncalibrated
Level 2, High Level Processing	Fully calibrated ASDF file	calibrated exposures