[gradsusr] Plotting data from rotated lat-lon grid

[Wesley Ebisuzaki]

Jonas,

      I don't have any occasions to use rotated lat-lon grids, so the 
rotated lat-lon grid
support in grib2ctl and g2ctl has been added by users.  Take a look at 
the code in
g2ctl because it is newer and uses PDEF.

    Yours,
    Wesley Ebisuzaki

 
Jonas Kaufmann wrote:
> Hello,
>
> I have a data set that is available on a rotated lat-lon grid which
> should cover the North Atlantic Ocean and Europe. The control file
> generated by grib2ctl.pl looks like this:
>
> dtype grib 255
> * Rotated LatLon grid: South pole lat -35.000000 lon -15.000000  rot
> angle 0.000000
> ydef 424 linear -35.500000 0.16
> xdef 582 linear -46.500000 0.16
>
> I have read that with Grads 2.0 and higher, it should be possible to
> extract data from these gribfiles by adding a PDEF line. I have tried
> with the following line, but this did not work:
>
> PDEF 582 424 ROTLL -35 -15 0.16 0.16 -35.5 -46.5
>
> How does the correct line look like or do I have to take other steps
> to use this dataset in Grads?
>
> Thank you for your answer!
>
> Best regards,
> Jonas Kaufmann
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