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

206 CHAPTER 18. EXPORT OF CIA DATA STRUCTURES
primary array. Since the BS PDS is compatible with the raster PDS, this routine also
works for beam-switch (CAM03) data. To save a beam-switch MOSAIC to a FITS file:
CIA> raster2fits, bs_pds, name=’bs.fits’
These FITS files can be viewed with packages like SAOIMAGE:
CIA> $saoimage raster.fits
imagette2fits writes each frame or EXPOSURE in the PDS field .IMAGE (along with the
corresponding frame of .RMS and .NPIX) to the primary array of an individual FITS file.
This makes it useful for exporting CVF observation (CAM04) and staring observation
(CAM01) data contained in an CVF PDS or general PDS. In the example below 20 FITS
files are created with a prefix taken from the keyword name.
CIA> help, cvf_pds.image
FLOAT = Array[32, 32, 20]
CIA> imagette2fits, cvf_pds, name=’cvf.fits’
CIA> $ls cvf*.fits
cvf1.fits cvf13.fits cvf17.fits cvf20.fits cvf6.fits
cvf10.fits cvf14.fits cvf18.fits cvf3.fits cvf7.fits
cvf11.fits cvf15.fits cvf19.fits cvf4.fits cvf8.fits
cvf12.fits cvf16.fits cvf2.fits cvf5.fits cvf9.fits
sad write fits Expert users of CIA may use SADs to hold their calibrated data. To write the
SADCMAPtoaFITSfile:
CIA> sad_write_fits, ’CSAD000014300601_98072013530646’, /cmap
Note that the FITS files created by the routines described above can be easily loaded into
IDL with the ASTROLIB routine READFITS.
18.3 Export for archiving
For archiving purposes we want to save the entire contents of a CIA data structure to an extended
FITS file.
struct2fits writes an entire CIA data structure to a FITS file. The data is stored in extensions.
CIA> struct2fits, raster_pds, name=’raster_archive.fits’
fits2struct recovers the output of struct2fits. It initializes the appropriate PDS and then fills
it as best it can. It is very useful for upgrading the architecture of an obsolete PDS.