Photometry in VO Spectrum Model

[Inga Kamp]

Hi all,

don't forget Echelle spectra when you discuss branching off the Spectral
DM. I am not sure I like to see separate models for all of them. I would
rather have one that is somewhat more extensive and everyone can pick what
he/she needs for his/her own data.

I agree that the current spectral DM could be published as is. But I think
it would be a mistake to come up with 5 different ones at the version 2
level. Then tools have exactly the same problem again - they have to read
multiple models and accomodate all the special needs.

Cheers,
Inga

On Mon, 23 Oct 2006, Pedro Osuna wrote:

> Hi all,
>
> we are not discussing about the protocol, we are discussing about the
> Data Model, as an abstraction of the data that represents properly those
> data. How to access them would be another issue.
>
> Some time ago I sent Jonathan a note in which I asked him for the
> blessing to create a small group working on Photometry data model
> definitions. I attach the mail I sent to Jonathan and his response
> (claiming that he believed everything related to photometry could be
> done with the current model).
>
> I think that modelling of Photometric data should be done properly, and
> in view of the fact that it is not precisely a trivial issue, probably
> the best at this time would be to:
>
> 1) release SED as is (without photometry description)
> 2) create a small group working on a model for Photometry as separate
> (or complementary or whatever) to the SED one.
>
> (In passing, I believe the same should be done for Time Series: create a
> proper model complementary to the SED but somehow separate (Pavlos
> Protopapas told me he has written something on this already....))
>
> If you'd agree with this approach, Jonathan could eventually give his
> blessing and an effort could be started to create the Photometry Data
> Model. We already identified a list of people interested in belonging to
> this effort (see the emails attached) within EURO-VO and could add to an
> IVOA overall effort.
>
>
> Cheers,
> P.
>
>
>
>
> >I can see that one might want to plot a spectrum in magnitude units in
> > a standard system.  A good question to consider however, is whether this
> > feature belongs in the user interface, where the spectrum is plotted in
> > whatever units the user prefers, or in the protocol.On Mon, 2006-10-23 at 09:09 -0600, Doug Tody wrote:
> > Hi All -
> >
> > On Mon, 23 Oct 2006, Pedro Osuna wrote:
> > > it was me who proposed the photometry thing.
> > >
> > > It is astronomers who like to do this "strange" things Doug, like liking
> > > to share data in magnitudes rather than real fluxes. I can give you many
> > > examples of those cases (whether "sensible" thing to do or otherwise is
> > > another issue), but just have a look yourself at Vizier using the old
> > > UCD system to guess how many catalogues there are there with photometric
> > > points (for instance, Johnson J):
> >
> > I can see that one might want to plot a spectrum in magnitude units in
> > a standard system.  A good question to consider however, is whether this
> > feature belongs in the user interface, where the spectrum is plotted in
> > whatever units the user prefers, or in the protocol.  This is similar to
> > displaying RA/DEC in sexagesimal units, while we use decimal degrees in
> > the protocol.  This sort of conversion is easily handled in the user
> > interface.
> >
> > 	- Doug
> --
> Pedro Osuna Alcalaya
>
> European Space Agency (ESA)
> European Space Astronomy Centre (ESAC)
> Research and Scientific Support Department (RSSD)
> Astronomy Science Operations Division (SCI-SD)
> e-mail: Pedro.Osuna at esa.int
> Tel + 34 91 813 13 14    Fax: +34 91 813 11 72
> -------------------------------------------------
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