Detailed information on possible ways of
handling GIS data can be found in the
following CDS Software Notes:
54: CDS-GIS Instrument Guide (PostScript 3 Mb)
55: GIS Software User Manual (PostScript 465 Kb)
56: GIS Calibration Details (PostScript 1 Mb)
A different approach is suggested and described in detail
in my PhD thesis and in various papers I wrote
(see e.g. Del Zanna et al. 2001 and references therein).
