rotated lat/lon grid

[Jennifer Adams]

A new PDEF entry for rotated lat/lon grids (ROTLL and ROTLLR) was  
implemented in version 2.0. Look in the pdef doc page http://iges.org/ 
grads/gadoc/pdef.html.
Jennifer


On Apr 17, 2008, at 6:47 AM, Hágel Edit wrote:

> Hi!
>
> I've started to use Grads just recently and I try to plot some grib
> files. These files contain data on rotated lat/lon grid with the
> following parameters:
>
> Data represent type:                                rotated lat/lon
> Number of points along a parallel.                 306
> Number of points along a meridian.                 260
> Latitude of first grid point.                   -20.427
> Longitude of first grid point.                  -46.475
> Resolution and components flag.               10000000
> Latitude of last grid point.                     31.373
> Longitude of last grid point.                    14.524
> i direction (East-West) increment.                 0.200
> j direction (North-South) increment.               0.200
> Latitude of southern pole of rotation.          -40.000
> Longitude of southern pole of rotation.          22.000
> Angle of rotation.                              .0000000000
>
> Could anyone help me how to plot these fields correctly, i.e. how to
> tell grads about the rotation? I generated the ctl file with
> grib2ctl.pl, and I get this as part of the ctl file:
>
> * Rotated LatLon grid: South pole lat -40.000000 lon 22.000000  rot
> angle 0.000000
> ydef 260 linear -20.427000 0.2
> xdef 306 linear -46.475000 0.199996721311475
>
>
>
> Thanks in advance,
> Edit Hagel

--
Jennifer M. Adams
IGES/COLA
4041 Powder Mill Road, Suite 302
Calverton, MD 20705
jma at cola.iges.org



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