SED Data Model: Questions and Comments

[Brian Thomas]

On Tuesday 15 February 2005 12:42 pm, Gilles DUVERT wrote:
> If 'Quantity' is, or will be, able to deal with such things as flux 
> conversions from/to air wavelength vs. humidity and frequency,etc..  and 
> Janskys from/to Cousins/Johnson magnitudes, at least to a large extent 
> and great accuracy, all the best. In that case all units or combinaisons 
> thereof supported by Quantity should be authorized in, e.g., the SED DM. 
> But at the same time one could use the Quantity DM to convert the data 
> beforehand to specific quantities that would be the only  ones referred 
> to in the SED DM, such as basic  MKSA units. And make the DM simpler.

 I agree that Q should have modeled within it the units, accuracy, 
 coordinate system..but the machinery that actually does the conversions
 from one Q to another Q is a separate software package itself (from 
 the serialization/IO package that handles the Q within other DM components).

 Otherwise, it sounds good to me. :)

 =b.t.


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|                                     
| Dr. Brian Thomas                    
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| Dept of Astronomy                   
| University of Maryland-College Park 
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| Phone: (301) 405-2312               
| Fax: (301) 314-9067                 
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