[ImageDM] Derived object

[Arnold Rots]

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

-------------------------------------------------------------------------------------------------------------
Arnold H. Rots                                          Chandra X-ray
Science Center
Smithsonian Astrophysical Observatory                   tel:  +1 617 496
7701
60 Garden Street, MS 67                                      fax:  +1 617
495 7356
Cambridge, MA 02138
arots at cfa.harvard.edu
USA
http://hea-www.harvard.edu/~arots/
--------------------------------------------------------------------------------------------------------------



On Tue, Nov 19, 2013 at 3:05 PM, CresitelloDittmar, Mark <
mdittmar at cfa.harvard.edu> wrote:

> Small thread..
> The imageDM contains a 'Derived' object which is carried over from the
> Spectral model.  This object definition:
>
> Derived:
>     - SNR
>     - Redshift.*
>     - VarAmpl
>
> I'd like to clarify the 'domain' for this information.  It seems rather
> 'Spectral" related, so I'm not sure if it needs to be included in the
> generic ImageDM at all, but can see that certain types of images might want
> this sort of information.
>
> Mark
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.ivoa.net/pipermail/dm/attachments/20131119/3de98e9c/attachment.html>