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

110 CHAPTER 13. DATA CALIBRATION
13.3.4 x cia caveats
x cia can only load a PDS from an IDL save file if the PDS has the variable name isodata. The
name of the actual save file is not limited in anyway and may be independent of the saved PDS.
13.4 Calibrating a PDS the old way
This section describes the calibration of a PDS using the old calib raster, calib bs, calib cvf
and calib struct routines. While these routines continue to work they are no longer maintained
within CIA. Use of the core calibration routines described in Section 13.2.1 gives the user more
flexibility and control over the calibration process. You are strongly advised to use the core
calibration routines.
13.4.1 calib raster
We present here an example calibration of a raster PDS with calib raster. This example follows
from Section 13.1.2.
1. First we make a copy of the uncalibrated raster PDS.
CIA> original_lw6_raster = lw6_raster
2. We apply a basic calibration treatment to the raster PDS by calling calib raster with
the keyword /all set – see the calib raster in the on-line help for the details of all.
CIA> calib_raster, lw6_raster, /all
Then save the calibrated MOSAIC so we can later compare with different calibration
results:
CIA> lw6_raster_all = lw6_raster.raster
3. We can look at the results of our calibration by loading the cube of IMAGEs and the
MASK from our raster PDS into x3d:
CIA> x3d, lw6_raster.cube, lw6_raster.mask
Clicking on the button mask indicates the pixels that have been masked as unstable. By
looking at the temporal history of the pixels you can immediately see if good stabilisation
and deglitching have been achieved. A vertical profile of some background pixels will tell
you if a good dark correction has been applied.
Another way of judging the quality of the calibration is to look at the signal-to-noise ratio
of some of the EXPOSUREs:
CIA> xsnr, lw6_raster.image[*,*,0]
Or simply display the MOSAIC with tviso.
CIA> tviso, lw6_raster_all