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<div class="moz-cite-prefix">Hi again, <br>
<br>
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. <br>
<br>
Another different topic is what to use with other data products
(simultaneous multiwavelength photometry, radial velocity
curves,...)<br>
<br>
Cheers, <br>
<br>
Enrique.<br>
<br>
On 06/17/2015 02:05 PM, Arnold Rots wrote:<br>
</div>
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cite="mid:CAJXToE_-8O3UVZBwCy533ZsAU5McNf3xEUJu8jTw6RYj62uA6w@mail.gmail.com"
type="cite">
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<div>There has been a fair bit of discussion in the past.<br>
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From my perspective, I suggested some minor changes to the<br>
</div>
STS format that, I believe, came out of Berkeley that would<br>
make them IVOA-compatible, but those were never put into it.<br>
</div>
<div>I also suggested a simple lightweight table format that was
based<br>
</div>
<div>on STC; that's still on my STC home page.<br>
<br>
</div>
<div>Cheers,<br>
<br>
</div>
<div> - Arnold<br>
</div>
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<div class="gmail_extra"><br>
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<div class="gmail_signature">
<div dir="ltr">-------------------------------------------------------------------------------------------------------------<br>
Arnold H. Rots
Chandra X-ray Science Center<br>
Smithsonian Astrophysical Observatory
tel: +1 617 496 7701<br>
60 Garden Street, MS 67
fax: +1 617 495 7356<br>
Cambridge, MA 02138
<a moz-do-not-send="true"
href="mailto:arots@cfa.harvard.edu" target="_blank">arots@cfa.harvard.edu</a><br>
USA <a
moz-do-not-send="true"
href="http://hea-www.harvard.edu/%7Earots/"
target="_blank">http://hea-www.harvard.edu/~arots/</a><br>
--------------------------------------------------------------------------------------------------------------<br>
<br>
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<br>
<div class="gmail_quote">On Wed, Jun 17, 2015 at 7:51 AM, John
Swinbank <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:swinbank@transientskp.org" target="_blank">swinbank@transientskp.org</a>></span>
wrote:<br>
<blockquote class="gmail_quote">Hi Enrique et al,<br>
<span class=""><br>
> On 16 Jun 2015, at 16:04, esm <<a
moz-do-not-send="true"
href="mailto:esm@cab.inta-csic.es">esm@cab.inta-csic.es</a>>
wrote:<br>
><br>
> FYI, attached you'll find a couple of documents that
will be presented at the CSP meeting on Thursday<br>
<br>
</span>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.<br>
<br>
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.<br>
<br>
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:<br>
<br>
- 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).<br>
<br>
- 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?<br>
<br>
- 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?<br>
<br>
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.<br>
<br>
While idly looking around earlier, I came across <a
moz-do-not-send="true"
href="http://wiki.ivoa.net/internal/IVOA/LightCurves/STSP.pdf"
rel="noreferrer" target="_blank">http://wiki.ivoa.net/internal/IVOA/LightCurves/STSP.pdf</a>
("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?<br>
<br>
Anyway, I’ve probably exposed myself as a raving lunatic
now, but perhaps this will give us some food for discussion
tomorrow!<br>
<br>
Cheers,<br>
<br>
John</blockquote>
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<br>
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<br>
<br>
<pre class="moz-signature" cols="72">--
Enrique Solano
Spanish Virtual Observatory
Centro de Astrobiología (INTA-CSIC)
P.O. Box 78
28691 Villanueva de la Cañada
Madrid, Spain</pre>
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