Nice ;-)
Andrea Preite Martinez wrote:
> Here are my comments on the UCDs proposed by SS people, see:
> http://portail.imcce.fr/fr/expert/ssvo/wgovp/propucd.html
>
> 1. meta.id.(x,y,z) Cartesian component of a vector
>
> In the present list of ucd-words you find
> S|pos.cartesian |Cartesian (rectangular) coordinates
> Q|pos.cartesian.x |Cartesian coordinate along the x-axis
> Q|pos.cartesian.y |Cartesian coordinate along the y-axis
> Q|pos.cartesian.z |Cartesian coordinate along the z-axis
>
> The keywords used for assigning these ucd-words are:
> Q|pos.cartesian.(x,y,z) |(x,y,z) axis coordinate position (U,V,W)
> component projected
>
> so that the description: y component of any-V-quantity
> leads to the ucd: any-V-quantity;pos.cartesian.y
>
> where vectorial quantities are, for the moment,
>
> V|phys.electField
> V|phys.magField
> V|pos.distance
> V|pos.pm
> V|pos.precess
> V|src.veloc
>
> On the other hand, pos.cartesian.x/y/z is a quantity (position on axis
> x/y/z), so that the description :
>
> Xpos on detector yields pos.cartesian.x;instr.det
>
> My suggestion is: keep pos.cartesian.x/y/z
I think that we introduce this meta.id when working on previous versions
where pos.cartesian did not exists.
>
> 2. obs.air suppress
> 3. replace with: obs.atm
> I agree.
> But then we need to change air into atm in:
> S|obs.air |Atmosphere
> Q|obs.air.extinction |Atmospheric extinction
> and
> Q|obs.air.mass |Airmass could become
> Q|obs.airMass
>
> 4. obs.atm.refraction / phys.refraction
> I support Jonathan suggestion: change into
> obs.atm.refractAngle
> phys.refractIndex
>
> 5. obs.elongation
> The elongation of a celestial body its the angular separation from the body
> around which it orbits
> The UCD for this quantity already exists: pos.angDistance
Not really!
Unless we do not need src.veloc.* because src.veloc exists. ( joke ;-) )
elongation is a "special/specific" parameter in planetology,
why not then pos.angDistance.elongation
>
> 6. obs.phaseAng
> as above
It is even less true here because pos.angDistance is the angular distance
betwwen two points (on a sphere) from the observer point of view
and obs.phaseAng gives the angle between the sun and the observer
from the observed spot point of view and is related to illumination,
light incidence and re-emission...
>
> 7. pos.az.ha, pos.az.azi, pos.eq.ha
> I agree with the proposal.
>
> 8. pos.brc.(), pos.earth()
> I basically agree. I also totally agree with Jonathan's comment.
>
> 9. pos.eop.()
> OK
>
> 10. pos.precess
> No, the description is all right: just <precession>
> Equatorial precession ==> pos.precess;pos.eq
> I prefer this, its more flexible.
but perhaps not sufficient to "describe completly" precession in some case!
>
> 11. phys.magAbs.G
> I'm only aware of the H mag (which is actually a visual mag!!)
> I remind you that phys.magAbs has E-flag: if you just need to specify the
> phot band, you can say: phys.magAbs;em.opt.V
~ phys.magAbs.G is a parameter for the derivation of the absolute magnitude of asteroids
>
> 12. src.orbital.meanMotion
> I suppose it is an average angular velocity (src.veloc.ang;stat.mean).
> No strong feelings about it.
>
> 13. ...veloc...
> to be revised (not only in the framwork of SS!!
sure
>
> 14. src.veloc.compon
> Not in the present list.
>
> Cheers,
>
> Andrea
>
> ==============================================================================
>
> Andrea Preite Martinez andrea-at-rm.iasf.cnr.it
> Istituto di Astrofisica Spaziale Tel.:+39.06.4993.4641
> Area di Ricerca di Tor Vergata Fax.:+39.06.2066.0188
> Via del Fosso del Cavaliere 100 Cell:+39.339.3817355
> 00133 Roma
> ==============================================================================
>
>
-- Pierre ------------------------------------------------------------------ DIDELON :@: pdidelon_at_cea.fr Phone : 33 (0)1 69 08 58 89 CEA SACLAY - Service d'Astrophysique 91191 Gif-Sur-Yvette Cedex ------------------------------------------------------------------Received on 2005-06-10Z16:00:05