[gradsusr] changing grid from 0-360 to -180-180 lon

[Wesley Ebisuzaki]

Hi,

   wgrib2 (v1.8.5) can change the grid of grib2 files using the 
-new_grid option.

           Wesley Ebisuzaki

P. R.M. wrote:
> I have a problem with longitude ranges not matching when opening 
> multiple grib2 files.
> - the first grib2 file (gfs) has a longitude range defined by g2ctl.pl as:
> xdef 720 linear 0 0.5
>
> - the second grib2 file has a longitude range defined by g2ctl.pl as:
> xdef 586 linear 261 0.066667
>
> when opening both files, setting an arbitrary longitude range, and 
> displaying a variable from the 2nd file, I get the following error:
> ga-> set lon -100 -50
> LON set to -100 -50
> ga-> d myvar.2
> Data Request Warning:  Request is completely outside file limits
>   Entire grid contents are set to missing data
>   Grid limits of file:     X = 1 586  Y = 1 481  Z = 1 1  T = 1 61  E 
> = 1 1
>   Grid limits of request:  X = -3914 1486  Y = -1724 -1123  Z = 1 1  T 
> = 1 1  E = 1 1
>
> the problem occurs because the first (gfs) grib2 longitude range gets 
> set from -180 to 180, while the second file's longitude range is in 
> the 0-360 range. grads doesnt seem to understand that the ranges 
> overlap and are, in fact, valid.
>
> I need set the 2nd file's longitude range to the -180-180 range, 
> without manually editing the .ctl file created by g2ctl.pl.
> is this possible to do through either grads or through wgrib2/g2ctl.pl?
>
> please help,
> thanks,
> P.R.
>
>
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