Appropriate UCD for (Cartesian) unit vectors on the celestial sphere

[Baptiste Cecconi]

> Le 22 oct. 2019 à 07:20, James Tocknell <james.tocknell at mq.edu.au> a écrit :
> 
> Hi everyone
> 
> I'm currently defining UCDs for a survey we're ingesting, and came across something that stumped me.  There are three rows representing the x,y,z coordinates of the unit vector on the celestial sphere. There does not appear to be anything appropriate to represent these columns (`pos.cartesian` is close but doesn't include the spherical nature of this system). Any suggestions for what UCD should be used?
> 
> Thanks
> James

Hi James, 

First, new UCDs for pos.spherical (and associated standard axes) are arriving in the upcoming version UCD 1.4.
Then, indeed I'm not sure how to set the UCD for your example. Could you be more specific, with a more extended example ?

Baptiste 
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