Time Domain presentation at CSP

[Enrique Solano]

Hi again,

STS was proposed as an interim solution to publish light curves in the
VO until the Spectral Data Model v2.0 was approved. However, nobody has
published light curves using STS and SDM v2.0 is now at the level of
"Proposed Recommendation". Given than SDM works better to represent
light curves I would clearly vote for it.

Another different topic is what to use with other data products
(simultaneous multiwavelength photometry, radial velocity curves,...)

Cheers,

Enrique.

On 06/17/2015 02:05 PM, Arnold Rots wrote:
> There has been a fair bit of discussion in the past.
> From my perspective, I suggested some minor changes to the
> STS format that, I believe, came out of Berkeley that would
> make them IVOA-compatible, but those were never put into it.
> I also suggested a simple lightweight table format that was based
> on STC; that's still on my STC home page.
>
> Cheers,
>
>   - 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 <mailto:arots at cfa.harvard.edu>
> USA                                                  
> http://hea-www.harvard.edu/~arots/ <http://hea-www.harvard.edu/%7Earots/>
> --------------------------------------------------------------------------------------------------------------
>
>
> On Wed, Jun 17, 2015 at 7:51 AM, John Swinbank
> <swinbank at transientskp.org <mailto:swinbank at transientskp.org>> wrote:
>
>     Hi Enrique et al,
>
>     > On 16 Jun 2015, at 16:04, esm <esm at cab.inta-csic.es
>     <mailto:esm at cab.inta-csic.es>> wrote:
>     >
>     > FYI, attached you'll find a couple of documents that will be
>     presented at the CSP meeting on Thursday
>
>     Thanks for these. It’s exciting to see folks exploring the
>     possibilities for publishing time series data in the VO, and this
>     is certainly the most concrete attempt to sum up the current
>     situation that I’ve seen.
>
>     My own involvement with most of the VO’s work to date has been
>     quite limited: my interests have really been focused exclusively
>     on VOEvent, so I am not familiar with the detailed work in data
>     modelling that have been undertaken elsewhere. Given that, my
>     approach is naïve, and for that I apologise.
>
>     That said: what I wonder about, both when looking at Enrique’s
>     document and when thinking about the issue in general, is what
>     requirements we have for representing time series data. To take
>     some examples:
>
>     - Enrique’s note (\S 2.6) points out that there’s no “DatasetType”
>     parameter in SimpleTimeSeries. I’m sure that’s true, but one might
>     also regard such a parameter as redundant (if I’m looking at a
>     SimpleTimeSeries, there’s probably a pretty good chance that it
>     involves time series data).
>
>     - At the recent Hotwired meeting, there was a fair bit of
>     discussion about handling event notifications, but nothing much
>     about the details of how to access time series data. The average
>     astronomer regards it as “just” fetching a list of numbers from a
>     database. Clearly that’s inadequate, but what’s _actually_
>     required to meet their needs? Why doesn’t the community regard
>     this as a problem?
>
>     - Addressing the same problem from the other end: time series data
>     is clearly not new. What prior work has been done by data centres
>     in making it available to their consumers? It’s really awesome to
>     see this work on the OMC Archive, but what approaches have others
>     taken? — if none, why not? If SSAP was previously being used, what
>     are its deficiencies?
>
>     To clarify, it’s not my intent to suggest that Enrique should
>     attempt to cover all this in his presentation tomorrow. I’m also a
>     bit worried that the above might sound as though I’m indicating
>     this work isn’t important, which is absolutely not my intention —
>     I just don’t myself feel like I have a good grasp of what we’re
>     ultimately aiming for.
>
>     While idly looking around earlier, I came across
>     http://wiki.ivoa.net/internal/IVOA/LightCurves/STSP.pdf ("Time
>     Series Data in the VO”, an early draft by Tody, dated 2010). I
>     glanced through the mailing list archives, and it doesn’t look as
>     though it was discussed here at the time. Does anybody know the
>     history? Why wasn’t this work taken forward? Is there something
>     there we should be building on?
>
>     Anyway, I’ve probably exposed myself as a raving lunatic now, but
>     perhaps this will give us some food for discussion tomorrow!
>
>     Cheers,
>
>     John
>
>


-- 
Enrique Solano
Spanish Virtual Observatory
Centro de Astrobiología (INTA-CSIC)
P.O. Box 78
28691 Villanueva de la Cañada
Madrid, Spain

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