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

19.6. ADVANCED SLICING WITH X SLICER 225
• M RASTER and N RASTER can be set to zero by a break of telemetry on a raster position
for one or two frames. Check these variables carefully because even if M RASTER and
N RASTER are false, the images will be correct. The x slicer will propose to break the
SCD corresponding to this raster position into three parts. You will have to use the ‘Merge’
buttons to rebuild a whole SCD.
19.6.5.5 On target flag and sequence number
The On Target Flag (OTF) variable appears in two places while using x slicer. First,youcan
select it as a slicing variable. This is no longer recommended, but that possibility has been left
available. Second, you are asked in the x handle slice window if you wish to use the Enhanced
OTF. These are two different things. It will be explained in a whole section below.
The Sequence number can sometimes be useful when more than one observation is contained
in a file as it can help to discriminate between them. The Sequence number (STN) in the SCDs
are recomputed according to their place in the SSCD. It is likely that you will get different
values in the STN field than the one displayed by x slicer.
19.6.5.6 Automatic slicers slicing variables
As you probably know by now, there are two other slicers in CIA. These are the automatic slicers:
spdtoscd and erdtoscd. See Section 12.2 for examples of usage, and also Sections 17.1.3 and
17.1.4. They both use three methods of slicing (the default method, Andy and gap mode),
described by the Table 19.6.5.6. The default is new method.
The main difference between these automatic slicers and x slicer, is that they only create
one SSCD per observation. You can use x slicer to create any number of SSCDs per observation,
though in general it is only desirable to have one per CONFIGURATION.
19.6.6 The x handle slice window
This window is really the heart of the program (from the user’s point of view). Most of the
important actions are chosen here.
19.6.6.1 Using the ‘Advanced Slicing’ Menu
This menu makes the manipulation of data very easy. There is only one point to remember:
it ONLY allows to PERFORM SELECTIONS. You have therefore to press the ‘Unselect All
SCDs’ button before using it. Then, choose the desired parameter in the menu and click on it.
Use then the ‘Redisplay’ to see the result of your choice. With this last button, you can select
the SCDs according to an ‘AND’ logical rule, for example LW2 filter AND 5.0 s of integration
AND PFOV of 3 arcsec AND number of frames greater than 15.
19.6.6.2 Using choice related buttons
Achoiceinx slicer is the list of the selected SCDs just before you hit the ‘Redisplay’ button.
Except for the ‘First Choice’ that is the result of the slicer a moi routine that was first displayed
to you.