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

162 CHAPTER 15. CIA DATA STRUCTURE HIGH-LEVEL ARCHITECTURE
single STATE and in addition parameters describing that STATE, e.g. coordinates, lens,
filter, etc. . . . The SPD SCD differs primarily in that it holds IMAGEs which have been
computed from the EOI and RESET FRAMEs. These IMAGEs are either directly taken
from the CISP data product or computed by CIA from the FRAMEs in the ERD SCD.
See also Section 15.2.2.
Set of Science CAM Data (SSCD) The SSCD is primarily designed to catalogue a set of
SCDs (either ERD SCDs or SPD SCDs, but not both together) belonging to the same
CONFIGURATION and variables which describe that CONFIGURATION. However, it
may be used to catalogue any number of STATEs: from all the STATEs in a AOT down
to a single STATE. See also Section 15.2.3.
Science Analysed Data (SAD) – AAR Level Contains two EXPOSUREs, one calibrated
in detector coordinates (from the CCIM data product) and the other calibrated in celestial
coordinates (from the CMAP data product). The SAD is also used to hold EXPOSUREs
(from the CMOS data product). In addition to AAR data products, the SAD may be used
to hold CIA calibrated EXPOSUREs and MOSAICs. See also Section 15.2.4.
Set of Science Analysed Data (SSAD) Contains a catalogue of a set of SADs. Its function
is analogous to that of the SSCD. In general, best use of the SSAD is made when it
catalogues SADs that belong to a single CONFIGURATION. However, it may catalogue
any subset of SADs from an AOT. See also Section 15.2.5.
Diagnostic Specific Data (DSD) Contains physical parameters of the camera: temperatures,
voltages, wheel positions, etc. It is directly used only by instrument experts for
in-depth investigation of ISOCAM behaviour. Such data that is of interest to the normal
user is also held in the SCD. Documentation of the DSD structure is beyond the scope of
the CIA User’s Manual 1 .
15.2.1 Standard fields of observation data structures
There is some similarity between observation data structures in their architecture, that is to say
standard fields exist in all. Generally, they contain information which is relevant to each data
structure, e.g. it is necessary to know the PFOV during an observation whether you have raw
FRAMES in a ERD SCD or calibrated IMAGEs in a SAD, but it is not necessary to keep RESET
FRAMEs in the SAD. This section describes these standard fields. Later sections describe fields
particular to each data structure.
1. NAME: The data structure name is unique to each data structure. The name is used
to store the structure on disk and as a pointer to the structure in memory. If you use
x slicer to slice your data then you have some choice in the selection of your own naming
scheme, see Section 12.3.7. Otherwise, if you are creating the data structures using IDL
conversion routines of Chapter 17 then each data structure is named by either one of two
conventions, as follows.
If the TDT and OSN is defined then the following convention is followed:
CDDDttttttooccss yymmddhhmmssdd
where,
1 Further details on the DSD may be found in the ISO Data Product Document or the CAM Parameter
Characteristic Document, 1991, ref ISOCAM ST110.