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

96 CHAPTER 13. DATA CALIBRATION
13.1.2 raster PDS
The raster PDS is designed to handle sliced data from the following observation types:
• raster (AOT#1)
• micro-scan observation (AOT#1)
To create the raster PDS from the sliced M×N SPD SCDs ( where N and M are the raster
dimensions) use get sscdraster. To continue the example of Section 12.2, we assume that the
IDL variables lw6 sscd and lw6 scd dir contain strings with the name of an SSCD (cataloging the
sliced SPD SCDs) and the name of the directory path where it is has been saved, respectively.
To avoid confusion and save on memory, it is a good idea to delete all SSCDs/SCDs (that may
be have been left over from the slicing process) using scd del or sscd del, reload the sliced
SSCD you want to calibrate from disk and then proceed to build your PDS:
CIA> lw6_sscd = sscd_read(’cssc143006010002_98060117274484.cub’, dir=scd_dir)
CIA> lw6_raster = get_sscdraster( lw6_sscd )
CCGLWDARK_97031713382678 not exact matching for : GAIN= 1 0;
CCGLWOFLT_98050815090326 not exact matching for : TINT= 15 36;
lw6 raster is a raster PDS containing all your prepared data. Don’t worry too much about
any unusual looking messages like the two appearing above. These messages appear when there
is slight mismatch between the CONFIGURATION of the best available calibration data and
the data in the PDS. Now that you have created a PDS it might be nice to take a look at its
architecture (Section 15.5.4 will guide you through its structure.) Since it is simply an ordinary
IDL structure as opposed to a CIA data structure, we can use IDL’s HELP to look at its innards:
CIA> help, lw6_raster, /str
** Structure , 54 tags, length=2294560, refs=1:
RASTERCOL INT 4
RASTERLINE INT 4
M_STEPCOL FLOAT 96.0000
N_STEPLINE FLOAT 96.0000
RA_RASTER DOUBLE 161.34459
DEC_RASTER DOUBLE 55.959980
ANGLE_RASTER DOUBLE 321.73999
RASTER_ROTATION DOUBLE 411.73999
RASTER_ORIENTATION
STRING = ’SPACECRAFT Y_AXIS’
ASTR STRUCT -> ASTR_STRUC Array[1]
NX_RASTER INT 80
NY_RASTER INT 80
RASTER FLOAT Array[80, 80]
RASTER_UNIT STRING ’’
RMSRASTER FLOAT Array[80, 80]
NPIXRASTER FLOAT Array[80, 80]
AOT STRING ’RASTER’
TARGET STRING ’HARO03 ’