[gradsusr] Plotting data from rotated lat-lon grid

[Jonas Kaufmann]

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