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What happens

The type of calibrations used depend, obviously, on the instrument and the data reduction recipes used. Typically there are three kinds of calibration frames:

ORAC-DR treats the first two kinds rather differently.

Library frames reside ORAC_DATA_CAL and their selection is hardwired either in the instrument class or in a DR primitive. The users are unlikely to be concerned with them unless they want to override them with their own.

Nightly frames are handled in a more complicated way. A DR recipe that generates a calibration frame is responsible for filing it with the pipeline. The pipeline will hand it back to recipes that require calibration recipes according to a set of rules that are defined on a per-instrument basis by the ORAC-DR infrastructure as well as a per-frame basis by the calibration rules files.



next up previous 98
Next: Finding calibration frames
Up: The ORAC-DR Calibration Selection
Previous: Description

ORAC-DR: Overview and General Introduction
Starlink User Note 230
Frossie Economou, Tim Jenness,
Malcolm Currie, Andy Adamson, Alasdair Allan, Brad Cavanagh
Joint Astronomy Centre, Hilo, Hawaii
June 2004
E-mail:starlink@jiscmail.ac.uk

Copyright © 1997-2004 Particle Physics and Astronomy Research Council