Handling data cubes in VO

[Roy Williams]

On Dec 26, 2005, at 1:11 PM, Arnold Rots wrote:
> Part of this, especially item 5, is really a DM discussion.
> David Berry proposed that the relation between physical coordinate
> axes and pixel coordinates is really a transformation between two
> separate coordinate systems (and provided an implementation).

There is as always a decision about where to stop on the road to 
complexity. The first stage is to make the subscripts real with linear 
interpolation, so that W(3.2) is defined to be 0.8*W(3)+0.2*W(4). Next 
we could offer a choice of interpolation schemes. Next we can identify 
a transformation to a physical coordinate (linear and log axes etc). We 
can have subscripts for both independent and dependent quantities -- 
irregularly spaced data.

I guess I would want to keep things as simple as possible, get a solid 
implementation and users, and only add sophistication when a real 
genuine use case -- or two or three -- scream their heads off and 
demand more complexity. That's just how I would do it.

Roy

California Institute of Technology
626 395 3670
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: text/enriched
Size: 1178 bytes
Desc: not available
URL: <http://www.ivoa.net/pipermail/dal/attachments/20051226/9be4be4f/attachment-0001.bin>