ObsCore: o_ucd for uncalibrated data?

[Petr Skoda]

> So in Alberto's usecase , "phot.count;stat.uncalib" is perfectly valid.

OK !

> UCD are not dedicated to fully identify the nature +format+unit of a quantity 
> , so we should keep the Unit information separate, as this is done in the 
> VOTable specification for PARAM of FIELD, where the unit attribute can be 
> used as /unit='adu'/.

Thanks Mireille, for justification. However I have the feeling that it 
would be extremely useful for VO publishers to have some best practice 
recipes for expressing common type of data - in particular the optical 
ground-based spectra as they seem to bring most complications (partly 
because the space data are well defined -  because of effort of HST 
and ESAC people who needed it).

And this concerns not only UCD but also UTYPES and in general units as 
well.

So can we (as VO insiders) make an agreement on how to express
(i.e what to fill in fields of UCD, UTYPE, UNITS ...)

1) raw spectrum with calibrated wavelength (still issues with vacuum/air 
!!! as noticed earlier)

2) continuum normalized spectrum

3) polarimetric spectra in all components

and for the clarity as well

4) absolute flux calibrated ground based spectrum (e.g the SDSS one)

??????????????


And besides this (I know we still do not have standard model and protocol 
:-((   for such cases)
however - lot of people want to publish light curves (as a ASCII tables 
perhaps binary fits encoded ..) but how to refer in obscore to such a 
collection ? (most amateurs have time, magnitude and filter name)

Best regards,

Petr Skoda

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*  Petr Skoda                         Phone : +420-323-649201, ext. 361 *
*  Stellar Department                         +420-323-620361           *
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