[WIP] WCS

[aguinot]

This the implementation of the Euclid WCS. It might relevant to make sure that:

• CCD is used instead of SCA
• All CCD indexing starts from 0 and not 1

[aguinot]

I am thinking at how I build the PV coefficients and I don't believe what I have done is correct. Here is why: I assume that when one build the astrometry solution it is done on the entire focal plane (and not CCD per CCD). Once the global solution is done, you can extract local one for each CCDs but it will still be consistent from one CCD to another. What I have done is computing the average PV coefficients on each CCD and I believe that will destroy the coherence of the astrometric solution between CCDs. I don't know how much of a problem it is and how to test for it 😕