pixel grid with
What aspects of the WCS proposal are specific to FITS, and what would
we do differently if starting again from scratch (e.g. XML)?
All angles in degrees?
OK, suits astronomy and software.
Left-handed (X, Y) coordinates?
Required for but can be very
Define the Euler angles by specifying the celestial coordinates at
the reference point (CRVALi)?
Also necessary for first-order behaviour but complicates
Require at all?
Yes, it ties the celestial coordinate system to a particular point
in the image.
Encode the algorithm type in
No, too restrictive.