Characterization question

[Arnold Rots]

Actually, in the first example you are talking about two separate
axes: Spectral and Redshift. We treat them separately.

The spatial axes are 1, 2, or 3-D.

It's all laid out in the STC standard.

  - Arnold

Laszlo Dobos wrote:
[ Charset ISO-8859-2 unsupported, converting... ]
> Hi group,
> 
>  
> 
> How do I specify overlapping axes in characterisation?
> 
>  
> 
> Let's say I have a spectrum and want to give the spectral axis in both
> angstroms and velocities. Do I just add two axes and mark them both SPECTRAL
> and assume that they overlap?
> 
>  
> 
> What if I have an image with two spatial axes? Do I add two SPATIAL axes
> then or just one and assume that the resolution etc. is the same in both RA
> and Dec?
> 
>  
> 
> What if I have overlapping spatial axes, let's say ra,dec and (for a not too
> good example) also Mpc? How do I associate one Mpc axis with Ra and the
> other with Dec.
> 
>  
> 
> I'm sorry, if I misunderstood something about the whole thing. (Samples on
> the CDS server are unfortunately not available).
> 
>  
> 
> What I'm actually working on is a generic toolkit to characterize data cubes
> with any number of dimensions, and I want to allow using multiple scales
> along the axes.
> 
>  
> 
>  
> 
> Thanks,
> 
>  
> 
>  
> 
> -Laszlo
> 
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Arnold H. Rots                                Chandra X-ray Science Center
Smithsonian Astrophysical Observatory                tel:  +1 617 496 7701
60 Garden Street, MS 67                              fax:  +1 617 495 7356
Cambridge, MA 02138                             arots at head.cfa.harvard.edu
USA                                     http://hea-www.harvard.edu/~arots/
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