[gradsusr] using re() to regrid NARR

[Wesley Ebisuzaki - NOAA Federal]

Roberto,

   NARR starts on the model grid and bilinearly interpolated to a Lambert
conformal grid (most fields).  The first thing that GrADS does is to
bilineaerly interpolate
the field to a regular lat-lon grid as defined by the XDEF and YDEF in the
ctl
file.  Finally you want to interpolate another time to get a 0.25 x 0.25
grid.
That's one interpolation too many.

Method 1.   What I would do.

Use copygb to convert to the 0.25 x 0.25 degree grid.
This works if your files are GRIB.

Method 2.  Change the GrADS control fiile.

   You can modify the XDEF and YDEF in the ctl file so that GrADS internal
    grid is the desired 0.25 x 0.25  degree grid.  No need to interpolate.

   Good luck,
   Wesley


On Wed, Feb 20, 2013 at 2:19 PM, Roberto Mera
<rjmera at coas.oregonstate.edu>wrote:

> All,
>
> I've been looking at the re() function in opengrads to regrid NARR to a
> 0.25 deg grid. I have another file from regional model output in a
> completely different grid that I would also like to regrid. Can the re()
> function be used for non-global data? I got some errors before when
> trying to regrid the files. It would not let me subtract them from one
> another. I had tried something like:
>
>   r25=re(tave,0.25)
>
> and the same thing with the regional model.
>
> Robert
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