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20041029: hyperslabbing in IDV?

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  • Subject: 20041029: hyperslabbing in IDV?
  • Date: Fri, 29 Oct 2004 14:44:52 -0600
>From: Rich Signell <address@hidden>
>Organization: USGS
>Keywords: 200410291952.i9TJqtvV020462 IDV geo slice

Hi Rich-
>
>Is there a way to hyperslab lon/lat dimensions in IDV?   

Not on the request.  You could write a little jython procedure 
to create a new set of lat/lon points and resample the grid
to that using the resampleGrid method I sent you earlier.

>I know that IDV can read
>DODS/OpenDAP files, and one of the great things about OpenDAP
>is that you can just grab the lon/lat/time range you want. 

This is a nice feature.

>I can see that IDV allows you to slice on time (just grab one, several
>or all the time steps), but not on lon or lat dimensions, right?  

Yup.

>If not, is there a way this might be added to a future release, or
>does this cause a fundamental problem with the way that IDV is designed?

Anything is possible given enough time and money. ;-)  I'm cc'ing
John Caron on this because he wrote the OPeNDAP interface we use
(part of the Java-netCDF package).  He's in the design stage of
the next version of this package, so perhaps he can comment on
this.  

For non-lat/lon projections, this could be tricky.  OPeNDAP subsets
by index, so you can't really just pass in a lat/lon bounds for
those types of grids.  Some middleware would need to do the 
interpretation of the lat/lon bounds to grid bounds.  The LAS
system is an example of such middleware.  The ADDE protocol allows
this in the server (no middle ware needed) but not OPeNDAP.

Don Murray
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