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Re: [cf-satellite] Proposal for band dimension and coordinate variable

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All,

A situation that needs to be considered:  How to represent a single band
file?  For example, can this be done w/o creating a 3D variable with
'band dimension' = 1?

Tom



On 7/25/11 2:29 PM, Jim Biard wrote:

Tom,
I think your simple index coordinate variable and my label coordinate variable are pretty much the same thing. Yours would contain a numeric sequence, and mine would contain descriptive strings. They both are examples of parametric drivers. The remaining question is - what constitutes a sufficiently unambiguous way to identify the ensemble of variables used to describe each band? Put another way, are the existing conventions for identifying auxiliary coordinate variables sufficient to the task of identifying the descriptors for the bands? 
Let's say that we have a parametric driver coordinate variable named 
band (with dimension band) that has an axis type of "index", and 
variables with axis types of "wavenumber", "bandwidth", and 
"polarization" (each with dimension band).  Is it sufficient to 
identify the wavenumber, bandwidth, and polarization variables as 
auxiliary coordinates on our data variable (via the coordinates 
attribute)?  Or is there a need to more explicitly declare the 
ensemble (perhaps via an attribute on the band coordinate variable)?

Jim

On 7/25/2011 3:02 PM, Tom Whittaker wrote:

Hi Jim...

On Mon, Jul 25, 2011 at 12:44 PM, Jim Biard<Jim.Biard@xxxxxxxx>  wrote:

Is this just too far out?

Far out, man!!  ;-)

Seriously, though, I don't see the need for such a device ("...make
the "band" coordinate variable an array of label strings...").  Based
on what Tom Rink and John Caron have said, it looks like defining a
"coordinate axis type" using a few select concepts is the best
approach.  We'll see what John as to say about the notion of a simple
index being used as a coordinate variable...and go from there...

tom









   
  
    
   

    
    
     
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