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

13.2. CALIBRATING THE PDS 101
13.2.2 Raster MOSAIC creation
The final step in processing raster observation data is creation of the raster MOSAIC from the
corrected EXPOSUREs. The routine raster scan will project all the EXPOSUREs on to the
raster field-of-view and place the resultant raster MOSAIC in the PDS field .raster.
CIA> raster_scan, lw6_raster
If you wish you can also convert the MOSAIC pixels to milli-janskys (mJy).
CIA> conv_flux, bs_pds, /raster
By looking at the MOSAIC you can really get an idea as to how good the calibration is. We
can display the MOSAIC most easily with tviso.
CIA> tviso, lw6_raster.raster
13.2.3 Staring analysis
Actually there is no real dedicated staring analysis. After the creation of the corrected EXPO-
SUREs (as in Section 13.2.1) the analysis of staring observation data is almost complete – the
final formality is the conversion of the EXPOSURE pixels to mJy.
CIA> conv_flux, staring_pds, /image
CIA> print, staring_pds.image_unit
mJy/pix
To check the quality of your analysis you can use tviso to display individual EXPOSUREs.
CIA> tviso, staring_pds.image[*,*,0]
Or you can use x3d (though only if you have more than one EXPOSURE).
CIA> x3d, staring_pds.image
13.2.4 Beam-switch MOSAIC creation
The final step in calibrating the BS PDS is the creation of the beam-switch MOSAIC, i.e. the
difference between the on source field EXPOSUREs and the reference field EXPOSUREs. The
routine reduce bs will perform this operation.
CIA> reduce_bs, bs_pds
For historical reasons the beam-switch MOSAIC is stored in the PDS field .raster (even
though beam-switching has nothing to do with rasters!). Now you can convert the MOSAIC
pixels to mJy.
CIA> conv_flux, bs_pds, /raster
As for the raster PDS you can check the results of the analysis with tviso.
CIA> tviso, bs_pds.raster