Rotated lat lon pole grid

[martynas kazlauskas]

Hi,

Have you used any of these scripts  attached below
(well, i'm adding them to this letter and hope that
they appear in this forum as well)? We use them to
"draw" regular coordinates on our Hirlam plots, while
the original grads coordinate set is switched off (we
use rotation 0 -30)(i assume that his is what you want
to do), so our equator is passing somewhere close to
Estonia. One example at
http://img227.imageshack.us/my.php?image=psir224rs2.png
 I believe these scripts originally created by someone
from the Finnish met institute. I'll check the usage
of them in my scripts if this is the way to solve your
problem.

Martynas Kazlauskas
LHMS
martynas(et)meteo.lt

> On Nov 28, 2007, at 6:47 AM, Conor Sweeney wrote:
>
> > Hi GRADS people,
> >
> > I'm sorry if I'm repeating previous questions, but
> I'm having
> > difficulty
> > plotting GRIB files which have a rotated south
> pole.
> >
> > I am using two different limited-area models;
> HIRLAM and COSMO. I have
> > included a .ctl file from a typical data grid
> below. A plot of this
> > grid,
> > produced by GRADS using the model's rotated
> lat-lon values, can be
> > found here:
> >
> > http://mathsci.ucd.ie/~hiwinds/MET_GEO.png
> >
> > As can be seen, the equator and prime meridian are
> neither in the
> > correct
> > location or orientation!
> >
> > This is not, as far as I can tell, a type of grid
> which is
> > supported by the
> > standard pdef options.
> >
> > Previous posts have mentioned the use of the pdef
> bilin option. I
> > have read
> > the grads manual, but still have no idea how this
> should be done.
> >
> > If anyone has ever managed to plot this type of
> grid successfully
> > on the
> > correct real-life lat-lon values, I would greatly
> appreciate your
> > help and
> > advice on how to do so.
> >
> > Thanks,
> >
> > C
> >
> > ----
> >
> > dset ^MET_GEO.grb
> > index ^MET_GEO.grb.idx
> > undef 9.999E+20
> > title MET_GEO.grb
> > *  produced by grib2ctl v0.9.12.5p39c
> > dtype grib 255
> > * Rotated LatLon grid: South pole
> > * lat -30.000000 lon -30.000000  rot angle
> 0.000000
> > ydef 284 linear -25.000000 0.147
> > xdef 438 linear -30.000000 0.147
> > tdef 1 linear 01Z01jan1919 1mo
> > zdef 1 linear 1 1
> > vars 1
> > GP0m  0 6,105,0 ** 0 m above ground Geopotential
> [m^2/s^2]
> > ENDVARS
> >
> > ----
> >
> > Dr Conor Sweeney
> > UCD Meteorology & Climate Centre
> > Belfield, Dublin 4, Ireland.
>
> --
> Jennifer M. Adams
> IGES/COLA
> 4041 Powder Mill Road, Suite 302
> Calverton, MD 20705
> jma at cola.iges.org
>
>
>
>



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