Concerning DM <--- Re: Time Domain DAL/DM/TDIG

[François Bonnarel]

Dear all,


     Within the scope of the current TimeSeries priority (see below
ada's email) we (Ada + Laurent + Mireille + myself)  have been reviewing
the "TimeSeries Cube data Model" note.

As a first step we concentrated on section 4 = "Time Series Cube DM" and
let the discussion of the beginning of the paper (section 1 to 3,
including "dependent data models") for the future. The only assomption
we make is that TimeSeriesDataModel should be derived/specialized from a
Sparse Cube ( see IVOA N-dimesnional Cube Model - volute link, with the
last diagrams modified available at ....)


      A very important point here is that we think we have to make a
conceptual modelisation without any a priori for the serializations or
Mappings we may use in the end. We have to understand the relationships
between the various concepts we need and follow the VO-DML rules
(as defined in the   VO-DML spec / document 1) for Model design.

      The product of this phase of analysis should be an UML diagram
with some text to explain it.

     In the following messages we will discuss Jiri's note section 4
along these principles. They will come a little later those days.

Best regards

François Bonnarel


Le 04/07/2017 à 13:08, AdaNebot a écrit :
>
> Dear All,
>
> In Shanghai it was decided that TimeSeries is a scientific priority of 
> the IVOA. Based on the DAL/DM/TDIG session, here is a list of items to 
> be discussed. Please feel free to add any other items you consider 
> relevant to TimeSeries and you would like to discuss:
>
>   * *What is TimeSeries data? *It is a temporal sequence of
>     measurements containing a time coordinate and a flux (or similar -
>     magnitude) / RV / position / polarisation / number of spots /
>     spectra / images. Light-curves and RV curves dominate the
>     landscape of TimeSeries.
>   * *Concerning DM:* there are models that work for representation of
>     some of the science cases proposed by the SPC.
>       o Modified SpectrumDM works fine for light curves with some
>         modifications.
>       o The draft TimeSeriesCube serialisation examples work with
>         SPLAT. But there’s still some discussion needed on the model.
>       o Feedback from people who have tried both models is appreciated
>         in this respect.
>       o Although light-curves and RV curves dominate the landscape of
>         TimeSeries, for which a modified version of SpectrumDM (or a
>         similar for RVs) would work, we should have an extensible
>         model towards other kind of data, perhaps built as a simple
>         derivation/specialization of the SparseCube DM.
>   * *Discovery:* Obscore/EpnCore + TAP could work if the time axis
>     information would be extended. What are the minimum mandatory
>     fields for TimeSeries data to be found by the user? For that
>     collecting science cases is important. A set of minimum data has
>     already been compiled during an ASTERICS meeting. Different
>     communities need to be properly represented. Attending to
>     astronomy meetings is important to hear the astro-community. See
>     the series of meetings under:
>     http://wiki.ivoa.net/twiki/bin/view/IVOA/IvoaVOEvent#Future_Events.
>     Please if you plan to attend any of these meetings or any other
>     related Time Domain meeting it would be useful to know it and to
>     post it on the wiki.
>   * *Format:* Time has to be properly formatted to combine data coming
>     from different surveys. See email from A. Rots (19 May 2017) sent
>     to DM, DAL and TDIG + reference A&A 574, 36 (2015).
>
> To keep track these items will be posted on the TDIG wiki, under the 
> TimeSeries section:
> http://wiki.ivoa.net/twiki/bin/view/IVOA/IvoaVOEvent#Time_Series_Data
>
> In particular under: 
> http://wiki.ivoa.net/twiki/bin/view/IVOA/DAL_DM_TDIG I have already 
> written these four items.
>
> You can also find a summary of the different contributions in the 
> DAL/DM/TDIG Shanghai session under:
> http://wiki.ivoa.net/twiki/bin/view/IVOA/DAL_DM_TDIG_ShanghaiSession2017
>
> The intention of this email is to start productive discussions on each 
> topic.
> Thanks!
> Ada

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