ISOCAM Interactive Analysis User's Manual Version 5.0 - ISO - ESA

Chapter 21
Using SLICE within CIA
This chapter 1 explains how to use the long term transient correction (or LTT) and variable flatfield
correction (or VFF) algorithms implemented in SLICE, which can significantly improve
raster data reduction.
21.1 Preface
For the examples in Section 21.3 and 21.4.1, we assume that you are reducing a raster observation
and that the data are currently stored in a PDS called data. Section 21.5 presents a worked
example in more depth.
Warning: Figures 21.1, 21.2, 21.3 and 21.6 are best viewed in color. If you don’t want to
print the relevant pages of this manual, you can print the last pages of the original document
An Introduction to SLICE inside CIA.
21.2 A brief description
What is SLICE? It stands for Simple and Light IsoCam Environment and was developed by
M. A. Miville-Deschênes (mamd@ias.u-psud.fr) from the original ground-base calibration data
reduction package ICE. Because it is Light, it is not as complete as CIA but is rather restricted
to the raster data reduction. It contains two specific tools that are not present in CIA and that
can allow significant improvements on the observation quality, when dealing with rasters: long
term transient correction (or LTT) and variable flat-field correction. Rather than duplicating
these tools in CIA, it was chosen to provide access to SLICE in CIA. As integration of two
software packages into one can prove delicate, the version of SLICE you can access in CIA is
frozen with respect to the version developed by M. A. Miville-Deschênes. Through him you can
probably obtain a more recent version of SLICE but we cannot guarantee its compatibility with
CIA.
For the examples in sec. 21.3 and 21.4, we assume that you are reducing a raster observation
and that the data are currently stored in a PDS called data. Sec. 21.5 presents a worked example
in more depth. Sec. 21.6 describes the principles of further data quality enhancement tools that
remove bad pixels and ghosts while protecting the sources. Finally, in sec. 21.7 we present a list
of frequently asked questions as well as frequently encountered problems.
1 Taken from Sauvage M., 2001, An Introduction to SLICE inside CIA
273