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

20.2. CORE CALIBRATION 235
6. method=‘ksig’
method: Second order deglitching on stabilised data. Remaining glitches, glitch tails and
residuals from transients can be rejected.
routine called: deglitch ksig clip
PDS side effects: Glitched pixels are flagged in .MASK.
7. method=‘manu’
method: Deglitch manu. The IMAGEs in .CUBE can be manually deglitched with this
method. Upon calling, instructions for use are displayed in the CIA command window
and a graphics window displaying a single IMAGE at a time from .CUBE is opened.
The mouse is used to select suspected glitched pixels and those pixels are replaced
with the median of their neighboring pixels.
Note that there are two other manual deglitchers, man mask and sl viewcube,
in the contrib directory of CIA. In addition x3d (Section 14.4.5) now has manual
deglitching capability.
An example call is:
CIA> deglitch, pds, method=‘manu’
This method is arduous, and is probably best used to get rid of persistent glitches
that other deglitching methods have failed to find.
routine: deglitch man
PDS side effects: Glitched pixels are removed from IMAGEs in .CUBE, i.e. .CUBE is
modified. Glitched pixels are also flagged in .MASK.
reference: ISOCAM Handbook, Chapter Data processing methods, Section Manual deglitch.
20.2.3 Stabilization
There are several methods that may be used to achieve stabilization, all of which are implemented
by stabilize and individual low-level routines. As with the other core calibration routines the
keyword method selects the required method. All the available methods are described below,
but before reading on it is worth noting that there are two kinds of stabilization methods. (i)
Masking methods that simply flag unstable pixels in .MASK. (ii) Fitting methods that modify
.CUBE in an attempt to compensate the data for the transient response of the CAM detector.
The fitting methods may also flag pixels. Technical details of some of these methods can be
found in the references given below and in the technical reports listed in Appendix K.
Before proceeding with the details of the different methods, stabilize has an important
keyword option that the user should be aware of. This is the keyword timeline. It determines
how the timeline is generated for the transient correction. It can be set to one of the following
string values:
arrival uses the BOOTTIME (available for OLP 7.0 products) or UTK.
tint creates the timeline from the integration time. No telemetry drops are taken into account.
scd creates the timeline from the integration time. However, telemetry drops within an SCD
are taken into account.