On Fri, 30 Apr 2004, David Berry wrote:
> > > I do not think this could account for Jamies problems since he was using
> > > NDFs (I presume), not FITS files.
> >
> > Not sure I follow you, GAIA had this problem for NDFs and FITS files. If
> > you mean the AGI business, then, yes I don't think this is related.
>
> Does GAIA use a FitsChan to read WCS from an NDF?
Not directly. It encodes the NDF_GTWCS FrameSet into a FitsChan to convert
it to FITS headers, passes them through Skycat and then uses another
Fitschan to recover the NDF FrameSet (so as I keep saying the basic
internal GAIA/Skycat data model is FITS-like, not NDF)..
> But Jamie said that he was getting the problem with KAPPA:DISPLAY as
> well, which definitely doesn't use a FitsChan - it just reads the WCS
> component directly using NDF_GTWCS. [which uses a simple AstChannel at
> the bottom, not a FitsChan].
As you see GAIA uses both forms for NDFs.
Peter.
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