Key points are not available for this paper at this time.
In Paper I, Greisen & Calabretta (CITE) describe a generalized method for assigning physical coordinates to FITS image pixels. This paper implements this method for all spherical map projections likely to be of interest in astronomy. The new methods encompass existing informal FITS spherical coordinate conventions and translations from them are described. Detailed examples of header interpretation and construction are given.
Calabretta et al. (Mon,) studied this question.