[Issues] Problems with astrometric

[Edwin A. Valentijn]

It has been a very wise and well thought over decision to decouple the 
astrometric solution form the re-gridding process.
It allows to re-process astrometric solutions, and also to arrive at 
global solutions. The plots of residuals of astrometric solutions, using 
the input data and not the re-gridded data are formally fully correct 
and do the right thing and are not misleading- they do what they are 
supposed to show: the residuals of  the astrometric solution.
If nevertheless larger errors appear, after re-gridding, than something 
else is wrong. The standard way to inspect this is the PSF end-to-end check

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Prof. Dr. Edwin A. Valentijn        University of Groningen
Head OmegaCEN                       www   : www.astro.rug.nl/omegacen
Kapteyn Astronomical Institute      tel   : +31 (0)50 3634011
P.O.Box 800                         mobile: +31 (0)6 48276416
NL-9700 AV Groningen                e-mail: valentyn at astro.rug.nl
The Netherlands                     www   : www.astro.rug.nl/~valentyn
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