Re: Rotated lat/lon grid

Dennis sent this offline, but I felt it was worth sharing here.

http://www.ncl.ucar.edu/Applications/index.shtml
Under Models", Click "CCSM: POP"

The POP model has an offset pole.

To plot a variable "t" you must associate the 2D lat/lon with the
variable via the reserved attributed "lat2d" and "lon2d":

        lat2d = f->TLAT
        lon2d = f->TLONG
        t_at_lon2d = lon2d
        t_at_lat2d = lat2d

As for plotting the country outlines, this is independent
of contouring. Regardless of what data you are overlaying on the
map, you should be able to get geographical outlines. You don't
have to do anything special other than setting the usual:

     res_at_mpOutlineOn = True
     res_at_mpOutlineBoundarySets = ...... ; if you need something other than
                                        ; the default

--Mary

On Thu, 8 Jan 2009 Oliver.Fuhrer_at_meteoswiss.ch wrote:

> Hi ncl-talk,
>
> Our model (COSMO) has a native grid of rotated lat/lon coordinates with
> the north pole shifted to a new location. If I understand the logic
> behind native grid drawing in NCL correctly, it is not possible to draw
> country outlines etc. for a non-transformed data representation. In
> order to do that, NCL would have to know the rotated lat/lon projection,
> be set to the same parameters as our model, have the tfDoNDCOverlay set
> to True.
>
> Is my understanding of this correct?
>
> Is there any other way to convince NCL to draw country outlines
> correctly over a non-transformed (native grid) representation of our
> model output?
>
> Are there any plans to implement the rotated lat/lon coordinates in NCL?
>
> Thanks for your help,
> Oliver
>
>
> ________________________________________
>
> Oliver Fuhrer
> Numerical Models
>
> Federal Departement of Home Affairs FDHA
> Federal Office of Meteorology and Climatology MeteoSwiss
>
> Kraehbuehlstrasse 58, P.O. Box 514, CH-8044 Zurich, Switzerland
>
> Tel. +41 44 256 93 59
> Fax +41 44 256 92 78
> oliver.fuhrer_at_meteoswiss.ch
> www.meteoswiss.ch - First-hand information
>
>
>
>
>
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Received on Thu Jan 08 2009 - 08:40:25 MST