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

174 CHAPTER 15. CIA DATA STRUCTURE HIGH-LEVEL ARCHITECTURE
Now convert the CAL-G file, named K.fits in our example, to a CDS 8 :
CIA> dark = calg2cds( ’K’, dir=calg_dark_dir )
n_rows 5
creating CDS CCGLWDARK_96052312123000
Listing the CDSs in memory we see that two CDS exist:
CIA> print, cds_list()
CCIGAIN_9504417414600 CCGLWDARK_96052312123000
CCIGAIN 9504417414600 is simply a conversion table for the raw values in DATA(i).GAIN.
CIA> gain = cds_get( ’data’, ’CCIGAIN_9504417414600’ )
CIA> help, gain, /str
** Structure CCIGAIN_STRUC, 1 tags, length=12:
GAIN FLOAT Array(3)
CIA> print, gain
{ 1.00000 2.00000 4.00000
}
CCGLWDARK 96052312123000 or dark is the CDS we are interested in. We can extract
the DATA substructure with cds get and display its contents.
CIA> dark_data = cds_get( ’data’, dark )
CIA> help, dark_data
DARK_DATA STRUCT = -> CCGLWDARK_STRUC Array(5)
CIA> help, dark_data, /str
** Structure CCGLWDARK_STRUC, 17 tags, length=8572:
SPARE BYTE Array(36)
TINT INT 2
EWHL INT 308
SWHL INT 112
GAIN BYTE 1
OFFSET BYTE 1
TEMPERAT FLOAT Array(10)
TRMS FLOAT Array(10)
TMIN FLOAT Array(10)
TMAX FLOAT Array(10)
VOLTAGE FLOAT Array(10)
VRMS FLOAT Array(10)
VMIN FLOAT Array(10)
VMAX FLOAT Array(10)
BLANK LONG -32768
BUNIT BYTE Array(12)
IMAGE FLOAT Array(32, 32, 2)
8 Now that you have CDSs in memory, as an alternative to manually playing around with the data structure
refer to Section 15.3.3 for a description of the CIA routine cds display.