Light curves in the IVOA

[Kirk D Borne]

There is another...  the space physics research
community has their own set of Virtual Observatory
protocols.  Since a large percentage of their
data sets are time series data, they have been
developing time series access protocols also.
See here:  http://tsds.net./

And see this paper on the subject:
http://arxiv.org/abs/1005.0813

- Kirk

----- Original Message -----
From: Arnold Rots <arots at head.cfa.harvard.edu>
Date: Monday, June 14, 2010 12:30 pm
Subject: Re: Light curves in the IVOA

> There is one more candidate which has the advantage of simplicity,
> flexibility, and complying with the IVOA Time metadata standard:
> 
>    http://hea-
> www.harvard.edu/~arots/nvometa/STC/STCTimeSeriesTableFormat.pdf
> There are probably a few features that are desirable in this format
> (as noted), but they are easy to incorporate.
> 
>  - Arnold
> 
> 
> Roy Williams wrote:
> [ Charset ISO-8859-1 unsupported, converting... ]
> > 
> > To the DM and DAL groups:
> > 
> > With the increasing importance of synoptic surveys in modern 
> astronomy, 
> > I am thinking that the IVOA could expand its repertoire of data 
> objects 
> > to include Light Curves. An interoperable protocol for exchanging 
> light> curves would open the current tight connection between data 
> and 
> > classifiers, allowing different light curves to be federated, and 
> data 
> > mining codes run on data from different repositories. I propose 
> that the 
> > IVOA work towards a Simple Light Curve Access Protocol (SLiCAP).
> > 
> > There would be two parts to the standard, as we have with SCS, 
> SIAP, 
> > SSAP etc:
> > -- How to represent a light curve as a file (Data Modeling)
> > -- How to query a light curve repository (Data Access)
> > 
> > For the standard format, one candidate is the well-documented 
> proposal 
> > called simpleTimeSeries [1], which already has strictly defined 
> Time, 
> > and good representation of errors, bandpass, and null-detections. 
> There 
> > is also the comprehensive architectural proposal from Tody et al 
> [2] 
> > which can represent light curves and spectra in a unified way. 
> Another 
> > way to represent light curves could be derived from "Referencing 
> STC in 
> > VOTable" from Demleitner et al [3].
> > 
> > For the query service, we might follow what the IVOA has already 
> done 
> > with images in the SIA protocol [4]: the request is a cone (RA, 
> Dec, 
> > size) and maybe other query paramters, then the response is a 
> table of
> > possible matches, with each row having a link to the actual light 
> curve. 
> > Other elements of the query protocol might be from the Simple 
> Time-range 
> > Access Protocol [5] which essentially extends the cone-search 
> idea to 
> > include time. The only difference from SIA would be that there is 
> a 
> > light curve under the link rather than an image.
> > 
> > We have been discussing light-curve representation withing the 
> VOEvent 
> > WG for some time, but perhaps it would be good to open the 
> discussion to 
> > DM and DAL. I would appreciate any thoughts, comments, or 
> relevant 
> > existing work.
> > 
> > Roy Williams
> > 
> > 
> > [1] http://www.dotastro.org/simpletimeseries/
> > [2] http://www.ivoa.net/Documents/Notes/DAL2Arch/
> > [3] http://vo.ari.uni-heidelberg.de/docs/note_stc_20100420.pdf
> > [4] http://www.ivoa.net/Documents/SIA/
> > [5] 
> http://wiki.astrogrid.org/bin/view/Astrogrid/SimpleTimeAccessProtocol> 
> > -- 
> > California Institute of Technology
> > 626 395 3670
> > 
> --------------------------------------------------------------------
> ------
> Arnold H. Rots                                Chandra X-ray Science 
> CenterSmithsonian Astrophysical Observatory                tel:  +1 
> 617 496 7701
> 60 Garden Street, MS 67                              fax:  +1 617 
> 495 7356
> Cambridge, MA 02138                             
> arots at head.cfa.harvard.eduUSA                                     
> http://hea-www.harvard.edu/~arots/
> --------------------------------------------------------------------
> ------
> 
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