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Calibration Database System

The process of creating quality reference files starts with the instrument and OTA teams, who are responsible for the various forms of calibration data pertinent to them. Following a delivery protocol, the teams create, validate, test, and submit the reference files to the INS/CRDS-CDBS Group, which in the process of preparation for delivery to CRDS and CDBS Operations performs additional validation. The end result is the ingest of the reference files into the HST's ground system reduction pipeline (OPUS), their archiving in the Data Archiving and Distribution System (DADS), and their inclusion in the CDBS on-line archives.

The Calibration Reference Data System (CRDS) is the replacement of the Calibration Database System (CDBS) at STScI. CDBS is a set of software and databases to support the delivery, installation, archiving, tracking, and assignment of reference files; while CRDS is a metadata based system that maps datasets to data using mapping rules. In here we will refer always to CRDS, unless there is a practical difference with CDBS that is worth mentioning. In both cases, the reference files are used for pre-archive and OTFR (On-The-Fly-Reprocessing) data processing and calibration, and they can also be retrieved from the HST archive for recalibration at a user's home site. The CDBS delivery system also governs the throughput-related reference files which are used by the Exposure Time Calculators via the pysynphot System.

This page details the protocols and procedures, and provides information for the reference files that have been delivered to CRDS or CDBS.

For questions, please email CRDS-CDBS Group, at STScI. (Note that you need to change "_at_" part of the e-mail address to "@" before you send your message.)