The STScI NICMOS Pipeline: CALNICA Single Image Reduction (Revision A)

Details The STScI NICMOS Pipeline: CALNICA Single Image Reduction (Revision A) The STScI NICMOS Pipeline: CALNICA Single Image Reduction (Revision A)

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997nicm.rept...28b&link_type=abstract

Instrument Science Report NICMOS-97-028, 13 pages

Computer Science

Hubble Space Telescope, Hst, Space Telescope Science Institute, Nicmos

Scientific paper

This ISR describes CALNICA, the single-image reduction portion of CALNIC, which produces individual calibrated images. We include a brief reminder of the NICMOS operational modes and data formats, then a description of the algorithmic steps in CALNICA, and then the reference files used by CALNICA. Changes in Revision A: The order of the calibration processing steps has changed for CALNICA versions 2.0 and higher: DARKCORR now precedes NLINCORR, and BIASCORR now follows MASKCORR. The nature of several steps has also changed. BIASCORR no longer performs the subtraction of the ADC zero level (not necessary), but instead performs the wrapped pixel correction. The NOISCALC algorithm no longer uses the value of NREAD in its calculations, but instead there are separate NOISFILE reference files for different settings of NREAD. The NLINCORR algorithm has been modified such that the three-piece quadratic correction has been replaced by a single linear correction. The DARKCORR step now uses separate reference files for each of the MULTIACCUM sample sequences. In versions 2.3 and higher of CALNICA the CRIDCALC algorithm applied to MULTIACCUM data has been modified such that the final countrate is computed using linear regression rather than using the mean of individual samples, and uses the NOISFILE reference file. We also indicate that the BACKCALC and WARNCALC steps have not yet been implemented.

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