[Top] [Prev] [Next] [Bottom]

45.4 Should You Recalibrate?

Although some users will find that the calibrated data produced by the RSDP pipeline-the standard calibration-are adequate, most users will want to consider recalibrating. The pipeline calibrated the data with the most up-to-date, WF/PC-1-specific calibration reference files available at the time the data was pipeline processed. However, updated or timely reference files frequently did become available after the data were processed (e.g., new dark reference files and the "closure" flatfields). Certainly if there are unusual features in the data or if the analysis requires a high level of accuracy, recalibration is necessary.

Finding that a calibration reference file has changed since the data were calibrated doesn't always mean that recalibration is necessary. The decision depends very much on which calibration image or table changed, and whether that kind of correction is likely to affect the analysis. Retrieving and comparing the recommended and used calibration files to examine any differences can help in the decision to recalibrate. (The table tools in the STSDAS ttools package can be used to manipulate calibration tables; the images can be manipulated in the same ways as the science data.)



[Top] [Prev] [Next] [Bottom]

stevens@stsci.edu
Copyright © 1997, Association of Universities for Research in Astronomy. All rights reserved. Last updated: 01/14/98 16:04:33