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

Appendix I
Upgrading old CIA structures
Structures created in previous versions of CIA will need some upgrading to be 100% compatible
with CIA 3.0.
I.1 Upgrading CIA 2.0 structures
• Since the MAR98 version of CIA there are unit tags in the PDSs: .CUBE UNIT, .IM-
AGE UNIT and .RASTER UNIT. If you want to use conv flux on a BS PDS or raster
PDS, then you will need to add .RASTER UNIT to a pre-MAR98 PDS and fill it with
‘ADU/gain/sec’ (assuming you have not already manually changed the units). Likewise,
for a CVF PDS and general PDS you will need to add .IMAGE UNIT. This can be done
with IDL’s CREATE STRUCT.
CIA> new_pds = create_struct( temporary( old_pds ), ’raster_unit’,
CIA> ’ADU/gain/sec’ )
Use IDL’s TEMPORARY to prevent making a duplicate copy of the structure while appending
the new tag.
I.2 Upgrading CIA 1.0 structures
• There is a small bug in the .ASTR substructure of the CIA 1.0 CVF PDS: the type of
the field .ASTR.CDELT is float instead of double. This problem will only manifest itself
when you attempt to load a CIA 1.0 CVF PDS when you have a definition of the ASTR
structure already in memory, eg. .ASTR in a CIA 3.0 raster PDS.
CIA> restore, ’old_cvf.xdr’
% RESTORE: Unable to restore structure, tag type disagrees with
existing definition: ASTR_STRUC.
% Temporary variables are still checked out - cleaning up...
Though small, this problem is awkward to solve. Open a second CIA session in parallel
with your first. In this new session load the CVF PDS as attempted above.
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