Time series: Annotation of light curves in VOTable

[François Bonnarel]

Dear all,

Thanks Ada for that note.

after discussion with Laurent Michel and Ada I have two points  to address.

1 ) I think it's better to mark the VOTABLE as being a timeseries right 
at the beginning of the document instead of putting the 
utype="timeseries" information at the beginning of the TABLE.

Utypes are sometimes used in VO specifications to give a role (in the 
IVOA) to the feature even if there is no datamodel behind. In the 
attached example I use a syntax for the utype proposed by Laurent in 
this private discussion.

2 ) In the current note the multiband case is serialized as 3 tables 
written in sequence. Each table has its own PhotCal GROUP attached. In 
the attached example (discussed with Ada) we propose an alternative: a 
single table with a "FilterIndentifier" column. 3 different Photcal 
GROUPS are attached to this tabel and the appropriate Filteridentifier 
PARAM in each of these group is referring to the column with the same 
name  in the TABLE. The assumption is that photometric metadata given in 
the GROUP are valid for all roaws where values of FilterIndentifier in 
the row and in the GROUP PARAM match.

Let's see what solution you prefer.

Cheers

François

Le 07/04/2020 à 11:36, ada nebot a écrit :
> Dear IVOA members,
>
> We have drafted an IVOA Note on
> *Time series: Annotation of light curves in VOTable*
>
> You can find this document under:
> http://www.ivoa.net/documents/Notes/LightCurveTimeSeries
>
> This document describes a proposal to annotate in a VOTable time 
> series data. It is limited to the most common type of time series in 
> astronomy: light curves, but it can be extended to other type of time 
> series data easily (such as e. g. radial velocities curves). 
> The annotation reuses elements of existing data models when possible 
> and defines a set of new elements.
>
> Looking forward to your comments and suggestions! Also, don’t hesitate 
> to distribute it around and ask us if you would like to be among the 
> list of authors. We would be happy to add anyone with an interest on 
> the proposal.
> Best,
> Ada for the TDIG
>
> --
> Astronome Adjointe
> CDS, Observatoire Astronomique de Strasbourg (ObAS)
> UMR 7550 Université de Strasbourg
> 11, rue de l'Université, F-67000 Strasbourg
> +33 (0) 3 68 85 24 20
>
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