Peter,
> seems you have come to much the same conclusions that I did -- except I
> was thinking about if I could make some use a MathMap with flux and
> spectral coordinates as input and modified flux as output -- so this must
> be more-or-less what's required for spectra.
>
> (Thinking ahead for a general system I guess you'd need to allow for other
> Frames or SkyFrames as well as SpecFrames, the thought I had was that flux
> can depend on azimuthal position, but that's not strictly a units
> question).
Flux depends on azimuth? Not heard of this one. Are you referring to the
change in pixel size across an image caused by the projection? This is an
issue which I'd like to shelve until we have a bit more experience in the
spectral case.
A case more closer to what I have in mind may be the use of TimeFrames
rather than SpecFrames. To cater for the more general case, it may
be better to use a name such as "DensityFrame" in place of "FluxFrame".
That is, a Frame in which one axis represents an independent variable X,
represented by a TimeFrame, SpecFrame, etc, and the other axis represents
a density value, "Y per unit X", for some quantity Y.
David
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