Rotated lat lon pole grid

[Jennifer Adams]

I received a patch from Matthias Grzeschik to support rotated grids
with "PDEF rotll". I have implemented in version 2.0 and will add it
into version 1.9 when I get back to working on that code for a non-
beta release. Please write to me directly if you want more information.
Jennifer



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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