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

82 CHAPTER 12. DATA SLICING
equal to OBS. So these SCDs must correspond to the second configuration. The remaining
SCDs represent STATEs of CAM between CONFIGURATIONs (e.g SCD number 16 and
17) or CAM acquiring calibration data (e.g SCD number 38 and 39).
At the moment we are only interested in the LW6 CONFIGURATION, so there are many
SCDs we need to discard. There are two ways of achieving this. (i) sscd clean 1 will
automatically break up an observation into its constituent CONFIGURATIONs – one
SSCD per CONFIGURATION. (ii) scd find can be used to search for SCDs we wish to
discard and in doing so create an SSCD for the CONFIGURATION we desire.
(a) sscd clean is invoked simply with. . .
CIA> cleaned_sscds = sscd_clean( spd_sscd )
Out of 41 SCDs:
7 are rejected due to mode
6 are rejected due to csh flag
8 are rejected due to qla flag
In total 33 are accepted
1-Jun-1998 17:27:36.00 SSCD_CLEAN v.2.0
sscd clean will have split spd sscd into three SSCDs (of course the number of SSCDs
returned will vary from observation to observation, just as the number of CONFIG-
URATIONs do). Two of the SSCDs correspond to the LW3 and LW6 CONFIGU-
RATION and the remaining SSCD contains calibration data.
CIA> print, cleaned_sscds
CSSC143006010001_98060117273666 CSSC143006010002_98060117274484
CSSC143006010003_98060117275395
We will ignore the calibration data (few observer’s will have such data) and concentrate
on the LW3 and LW6 CONFIGURATION. We will use sscd info to find which
SSCD corresponds to which CONFIGURATION.
CIA> sscd_info, cleaned_sscds[0], /deg
16 SCDs in the SSCD: CSSC143006010001_98060117273666
seq channel mode fltrwhl pfov tint gain offset size ra dec
0 LW OBS LW3 6.0 5.04 2 512 31 161.244 55.967
1 LW OBS LW3 6.0 5.04 2 512 20 161.282 55.983
2 LW OBS LW3 6.0 5.04 2 512 20 161.319 56.000
3 LW OBS LW3 6.0 5.04 2 512 20 161.356 56.016
etc...
CIA> sscd_info, cleaned_sscds[1], /deg
16 SCDs in the SSCD: CSSC143006010002_98060117274484
seq channel mode fltrwhl pfov tint gain offset size ra dec
0 LW OBS LW6 6.0 5.04 2 512 51 161.244 55.967
1 LW OBS LW6 6.0 5.04 2 512 20 161.282 55.983
1 Note that sscd clean does not work with beam-switch data unless the spdtoscd keyword /bs is set (see
Section 19.4.1).