UCDs to describe atmospheric conditions

[Mireille LOUYS]

Ciao , Alberto,

Yes I think these are part of the Observing conditions metadata we may 
want to distribute along
with observations .

Having the defintions of each term you propose will help to see ,

  * what is already re-usable
  * how common these terms can be across projects

Are some specific to some kind of observing mode , f.i. adaptive optics 
, etc ...?

Many thanks for a more complete description of these terms , and may be 
typical situation of use .

Cheers, Mireille


Le 15/03/2022 à 10:50, Alberto Micol a écrit :
>
> Dear Semantics WG,
>
> ESO measures the atmospheric conditions at the various sites (Paranal, 
> La Silla, Chajnantor, and later Armazones).
>
> Here, a minimal list of the most important quantities measured:
>
> ·Absolute humidity
>
> ·Relative humidity
>
> ·Turbulence intensity (in units of m**(1/3))
>
> ·Temperature
>
> ·Dew temperature
>
> ·Precipitable water vapour
>
> ·Wind direction
>
> ·Wind speed component U, V, W
>
> ·Rain (percentage)
>
> ·Coherence time of the turbulence (Tau0)
>
> ·Isoplanatic angle (Theta0)
>
> ·Characteristic velocity of the turbulence
>
> ·Small (0.5 micron) dust particle count per cube meter
>
> ·etc.
>
> Some of those quantities are measured at different altitudes around 
> the domes (e.g. from -20m to +30m from the level of the VLT platform);
>
> some others are measured at very different levels (from 0.5km to 16 
> km) to build the atmospheric vertical profiles of e.g., humidity, 
> temperature, turbulence, etc..
>
> All those measurements are offered via the ESO TAP (tap_obs).
>
> The problem is that there are no UCDs I could use to describe those 
> columns
>
> (apart from the obvious phys.temperature, but then what to use for the 
> dew temeperature?).
>
> Would it be possible to introduce some new UCDs to cover those concepts?
>
> I can provide the definitions for the listed quantities, if that helps 
> defining those UCDs.
>
> I also hope that other ground-based observatories have the same need, 
> anybody out there?
>
> Many thanks,
>
> Alberto
>
> --
>
> Alberto Micol
>
> Science Archive Group
>
> European Southern Observatory
>

-- 
--
Mireille Louys,  MCF (Associate Professor)
Centre de données CDS		IPSEO, Images, Laboratoire Icube
Observatoire de Strasbourg	Telecom Physique Strasbourg
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