How to consume TAP and SIAP for lightcurve survey ?

[Douglas Tody]

Hi Petr -

You have an awful lot of questions here and it is not clear why you ask
about TAP/ObsTAP in a query about light curves, since there is little
connection (except maybe for a catalog of variable objects with
associated light curves which might be simple array objects in a table).
As you know the ultimate solution for time series data in the IVOA is
still under consideration, and in the meanwhile we are merely exploring
alternatives.

You also ask about SIAPV2 and photometry.  The thinking, as discussed in
Sao Paulo, is to base the Image DM on SDM (the new Spectral DM), which
is mostly just generic Observation / Characterization etc. metadata
which should be common to all the DAL interfaces.  SDM includes the
necessary parts of the PhotDM to be able to describe photometric bands,
hence this would work to describe the photometric band observed by an
image.  Likewise SDM will include the essentials to describe photometric
bands in time series.  SDM is designed to support time series as well as
spectra and SEDs so would be logical to use as the core model.  With a
little more work we should have enough defined to do some prototyping to
put up time series data from a few real collections, and we will see how
well it works with real data and real users.  If you need to do
something with your students soon you should probably just find a
temporary solution focusing on the science, while this sorts itself out.

 	- Doug


On Thu, 17 Jan 2013, Petr Skoda wrote:

> Hi all
>
> my original question was about light curves not radio data cubes ;-)
> So is there a suggested solution here ?
>
> How the suggested SIAP2 joins the photometry data model ? I will repeat - we 
> need some quick solution for the students working on our survey and there 
> should be something able to display the light curve and some processing on it 
> - Period analysis, folding with phase ....
> Is Iris going to do this ? So far I have seen just web service of VOA linked 
> to several surveys directly.
>
> BTW concerning TAP -
>
> the question remains - not only HOW to consume but WHAT to consume in TAP
>
> I cannot find anything that would realize the idea of querying all servers 
> using obscore to make discovery as described in the motivation of introducing 
> the ObsTAP.
>
> nice examples in Appendix A of
>
> http://www.ivoa.net/Documents/ObsCore/20111028/REC-ObsCore-v1.0-20111028.pdf
>
> do not work - the stated service "http://www.cadc.hia.nrc.gc.ca/caom/sync
> does not exist.
>
> In no TAP service available in Astrogrid registry over Topcat is the obscore 
> table ....
>
> Where are all TAP services ? In TOPCAT there is access only to Astrogrid 
> registry (EURO-VO registry query crashes) and in Astrogrid there are only few 
> TAP resources - some catalogues and planetary tables + heteregeneous set of 
> GAVO tables.
>
> I was expecting CADC is advanced in TAP - but no entry seems to be for direct 
> access to CADC.
>
> I would expect obseration logs of missions and surveys to be put in obscore 
> and allowed for the discovery process ...
>
> What  am I doing wrong ?
>
>
> Petr
>
> *************************************************************************
> *  Petr Skoda                         Phone : +420-323-649201, ext. 361 *
> *  Stellar Department                         +420-323-620361           *
> *  Astronomical Institute AS CR       Fax   : +420-323-620250           *
> *  251 65 Ondrejov                    e-mail: skoda at sunstel.asu.cas.cz  *
> *  Czech Republic                                                       *
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