[gradsusr] shift longitude range in grib2 file from 0->360 to -180->180

[Wesley Ebisuzaki]

P.R.
> can this be achieved by simply using wgrib2, or would I need to 
> convert the data in grads, and then export&convert back to grib2?
With the May 2010 version of wgrib2,

    wgrib2 in.grb  -lola 180:720:0.5 -90:361:0.5 out.grb grib

I don't like -lola because it does nearest neighbor interpolation but it 
is not a problem for you.

               Wesley


P. R.M. wrote:
> I have a grib2 dataset (gfs winds) that spans 0-360 degrees longitude, 
> in 0.5 degree increments.
> I need to convert this dataset into the range from -180 to 180, so I 
> need the grid to start at 180 degrees longitude instead of at 0 
> degrees longitude. (fyi, the 0-360 range simply doesnt work for a 
> custom application that Im running).
>
> how can I perform this conversion, and store back into grib2 format?
> can this be achieved by simply using wgrib2, or would I need to 
> convert the data in grads, and then export&convert back to grib2?
>
> please help,
> thanks,
> p.r.
>
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