[ImageDM] Derived object

[CresitelloDittmar, Mark]

Arnold,

Yes.. a bit,
There is currently no actual connection between the Image and Spectral
models other than their use of/extension of the Observation class.
So you are getting a little ahead of me.

With the discussion of the relation of Observation and Dataset, I have been
looking into the separation of these components.

The printout I was using seems to have dropped several pages, so missed the
write-up on Derived in the document
(Thanks Doug for the excerpt.. it made me double-check).

If Derived holds information about the Target which is derived from the
Dataset, then it seems that any object associated with a Target could
potentially have Derived info about that Target.

Mark


On Tue, Nov 19, 2013 at 3:57 PM, Arnold Rots <arots at cfa.harvard.edu> wrote:

> It seems to me that we are running into chicken-and-egg problems here.
> What is the toplevel model?
> If ImageDM describes the generalized data hypercube,
> then Spectral is a subset, with all axes, except the spectral one,
> collapsed.
> If that is not the case, then there ought to be a generalized Hypercube
> model from which both ImageDM and Spectral are derived.
>
> No matter what, all three objects you list should be included in the root
> model,
> because they have meaning for all models derived from it.
> However, I am not quite sure what SNR refers to (I know, I should look it
> up).
> I assumed it is some form of noise and sensitivity measure .
>
>   - Arnold
>
>
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