SSA-1.1

[Douglas Tody]

Almudena -

This would appear to be more an issue for the Spectrum DM and a future
time series access protocol.  The current plan is to generalize the
Spectrum DM so that it can be used for spectra, time series, or SED
segments (which can also include individual photometry points).  The
Spectrum DM 1.2 draft already includes some of this.  I agree that all
of the things you mention are needed.  It would be good as time series
prototyping proceeds if we could coordinate our respective efforts to
add support for time series data (within VAO this is part of the ongoing
time series science initiative).

 	- Doug


On Mon, 28 Mar 2011, Almudena Velasco wrote:

> Hello Patrick,
>
> If you remember I made a presentation proposing some minor changes that would 
> make the SSAP extensible to light curves, in the last Interop in Nara. Here 
> is a summary of them. The SVO propose to include them in this version or, 
> preferably in the 1.2 version.
>
> 1. There is a way to define the Flux and Spectral Axis column names, but not 
> for Time Axis column name if we deal with light curves in native format. So 
> that, it would be necessary to add TimeAxis in the Dataset Metadata.
>
> 2. The SSAP defines a DatasetType value which is always “spectrum”. It would 
> be necessary to have the possibility to set a “TimeSeries” type, as well as 
> the new MIME types for light curves, for example; timeseries/fits.
>
> 3. The parameter Char.SpectralAxis.Coverage.Bounds.Extend could be set as 
> recommended, same to the parameter
> Char.TimeAxis.Coverage.Bounds.Extend , instead mandatory, as is now.
>
> 4. For the SDM, the field 'Data.SpectralAxis.Value” is set as mandatory while 
> the TimeAxis.Value is optional. We think it could be changed to optional.
>
> 5. Also, we think that a way to identify time series services in the registry 
> is needed. Nowadays, as you can see, if we search for SSAP services in the 
> registry, we find the timeseries services mixed with spectrum services. The 
> solution would be to add two SSAP subtypes, one for spectrum services and 
> another for light curves services.
>
>
> Regards,
> Almudena Velasco
> Spanish Virtual Observatory
>
>
>
> El 14/03/11 17:32, Patrick Dowler escribió:
>> The (hopefully) final draft of the minor revision SSA-1.1 has been uploaded 
>> to
>> the twiki site:
>> 
>> http://www.ivoa.net/cgi-bin/twiki/bin/view/IVOA/SSA_v1_1
>> 
>> Anyone who implemented SSA-1.0 services or applications that interact with
>> SSA-1.0 services should look it over and comment before the end of this 
>> month
>> (March 2011).
>> 
>> Note: This version only has minor bug fixes to the spec and no new
>> functionality; new features and/or larger scale changes are to be 
>> considered
>> in SSA-1.2 only.
>> 
>
>
> -- 
> -----------------------------------------------------------------------------
> Almudena Velasco Trasmonte ( avelasco at cab.inta-csic.es )
> Lab. de Astrofísica Espacial (www.laeff.cab.inta-csic.es)
> European Space Astronomy Centre (ESAC)
> Villafranca del Castillo - E-28691 Villanueva de la Cañada - Madrid - Spain
> Tel.: 91 813 13 09  Fax.: 34 91 8131160
> -----------------------------------------------------------------------------
>