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

20.8. TIPS ON CIA DATA CALIBRATION 249
CIA> help, /struct, eph
** Structure , 3 tags, length=72, refs=1:
JD DOUBLE Array[3]
RA DOUBLE Array[3]
DEC DOUBLE Array[3]
Now you are ready to create the final mosaic, which is contained in the tag .RASTER. To
benefit from from superresolution due to the motion of the comet, a magnification factor of 3 is
chosen.
CIA> project_sso, sso_pds, eph=eph, magnify=3
CIA> tviso, sso_pds.raster
Figure 20.3: Comparison of standard vs. improved SSO processing
Left: SSO without correction for proper motion.
Right: SSO including correction for proper motion. Note that this result benefits from superresolution
due to the motion of the comet. Due the rebinning of the pixels, the flux per pixel is
reduced by the factor 9.
20.8 Tips on CIA data calibration
If you have read the last sections then you will have realized that a great choice of calibration
methods exist in CIA. Though some broad recommendations can be made on which methods
to use, the only way you can be sure that you are achieving good calibration is through experimentation
and experience.
A good way to know what is happening is to go through each calibration step, check your
result and then proceed with the next step. However, you do have to be careful how you proceed.
CIA requires that certain calibration processes follow a particular order. There are broad rules
you must follow if you want to get a sensible result. Some processes can be repeated without
having to start from scratch with raw data.