Hi everybody,
some comments...
A.0 instr.obsty
- S | instr.obsty | Observatory satellite mission you mean Observatory or satellite mission -> Observatory / satellite mission ? - Q | instr.obsty.site.seeing | Seeing
Is this the global seeing resulting of detector, instrument, atmosphere... or does it concern only the instrumental part? If so, did we need a obs.seeing?
Not clear for me.
A.1 phys.veloc.trans
- Q | phys.veloc.transverse | Transverse / tangential velocity
I am not sure that these two definitions are (allways?) compatible.
Moreover, transverse is perhaps not the right word. It isn't tangential, as opposed to radial?
Or do we need two definitions? But velocity transverse to the mouvment seems strange/unappropriate?
A.2 radial velocities
they are now spread in 3 separate group
- phys.veloc.[lg|lsr] - spect.dopplerVeloc.* - src.redshift.*
A.3 pos.* the big case/issue already clarified but still some inhomogeneity or confusion (at least in my head).
A.3.1 pos.earth
Q | pos.earth.lon | Longitude on Earth exists but not latitude! Q | pos.earth.altitude | Altitude on Earthexists but not distance which give the distance to the center
A.3.2 lon/lat/alt/dist
For any coordinate system (pos.*centric and mainly pos.bodyrc)
the four informations can be usefull, and if pos.distance
is available the others don't exist, and can be used to construct composed words.
I suggest introduction of pos.[alt|lat|lon] (at least the two last ones)
to be able to used composed words like pos.lat;pos.bodyrc
or to introduce [dist|lat|lon] for all coordinate system and alt for some of them.
A.3.3 Some subdivision are not sufficients.
pos.bodyrc as mentionned above ;-)
but also : pos.precess, pos.earthop.nutation and pos.earthop too
see corresponding needs at http://www.imcce.fr/fr/expert/ssvo/wgovp/ucdtree.html
B additional comments mainly related to (small?) solar system objects ( or extra solar system sytem and not only planetary one ;-) )
B.1 Mean motion
>>>>> Andrea Preite Martinez wrote: >>>>> >>>>>> 12. src.orbital.meanMotion >>>>>> I suppose it is an average angular velocity (src.veloc.ang;stat.mean). >>>>>> No strong feelings about it. >>>>>
B.2 asteroid Absolute Magnitude
H is the absolute magnitude which already exist in the UCD (phys.magAbs) for asteroids we need also the slope parameter usually called G : phys.magAbs.G but seen as a kind of "calibration" parameter may be a better place somewhere else in the UCD tree is perhaps possible?
B.3 pos.precess
I guess pos.precess could be more generic because it could be used both for the equatorial and ecliptic precessions. Perhaps we should change .ra and .dec to .lon and .lat and, in the same way, .dzeta, .z and ,theta should be change because they usually refer to the equatorial precession when the ecliptic precession parameters are expressed with other letters.
B.4 pos.eop.*
Jonathan McDowell wrote:
> * pos.eop.* I like, although as we become more active on other worlds isn't it likely
> that we'll be needing similar parameters for Mars, etc.? But maybe it's fine for now.
yes, SolarSystem people mind about this. But the Earth is a special case which is used often in ephemeris computation. I guess that first this UCD should be created and then a more generic one should be added ?
That's all for the moment.
sincerely yours,
Pierre
Andrea Preite Martinez wrote:
> Dear all,
>
> after 26 days of discussion and contributions from many of you, I decided to
> sum up things and to modify the list of words according to my personal
> feelings.
>
> You can find the proposed list in the txt file appended.
> Of course the discussion is not over, but unfortunately we need a rather
> "stable" version soon.
> The PR-version of the document (the text accompanying the list) will be sent
> around after the meeting in Garching.
...
>
> Regards
>
> Andrea
> ==============================================================================
> Andrea Preite Martinez andrea-at-rm.iasf.cnr.it
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