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

12.2. AUTOMATIC DATA SLICING 79
The ERD SCDs are both in memory and saved on disk. This is useful if you wish to end
your CIA session – with sscd read you can easily recover the ERD SCDs from disk in a
later session.
Let’s take a look at the contents of memory as follows:
CIA> print, sscd_list()
CSSC143006010001_96082811465989
CIA> print, erd_sscd
CSSC143006010001_96082811465989
As expected the only SSCD in memory is erd sscd. Now take a look at what SCDs are in
memory.
CIA> print, scd_list()
CSCD143006010001_96082811470062 CSCD143006010002_96082811473689
etc...
CIA> print, sscd_elem( erd_sscd )
CSCD143006010001_96082811470062 CSCD143006010002_96082811473689
etc...
Again as expected the only SCDs in memory are those that correspond to erd sscd.
For convenience, assign the names of the SCDs in memory to an IDL variable.
CIA> erd_scds = sscd_elem( erd_sscd )
4. Remember that erd scds is an array of names of ERD SCDs, i.e. SCDs which contain EOI
and RESET frames.
CIA> help, scd_get( ’eoi’, erd_scds[0] )
INT = Array(32, 32)
This means that we must convert them to SPD SCDs using erd2spd. There are two ways
of doing this, the first uses the routine frames to image and the second erd2psd .
(a) Using frames to image is probably the simplest way to convert ERD SCDs to SPD
SCDs. . .
CIA> spd_sscd = frames_to_image( erd_sscd, ack=ack )
Since a new SPD SSCD, spd sscd, is created we can delete the old ERD SSCD and
its SCDs.
CIA> sscd_del, erd_sscd
(b) Find the number of ERD SCDs that we have created: