Winddirection: Rotated LatLonGrid

[Ronny Meyer]

Hi Lee, thanks for the answer, but the problem became obsolet for me.
Ronny

>Ronny,
>Yes, the scalar should be the same.  For the vectors:  one option, while
>not the best, is to treat the entire rotated domain as station data.  You
>can then plot the u;v "station data" with oacres() and interpolate to a
>geographic grid with the resolution of your choice.  More details are in
>the GrADS manual under Station Data, or I can provide a sample if you
>need.
>
>Lee
>
>
>
>
>>Hi, I am looking for a solution or a GRADS-script for the following
>>problem:
>>
>>I have the windspeed and winddirection in a rotated LatLon grid and I
>>want to compute the windspeed and winddirection in the geographical grid.
>>I think, that the windspeed (as a skalar) must be the same in both
>>grids, but what is with the winddirection?
>>It is clear that I can determine the new angle by calculating the u- and
>>v-component in the rotated grid and do the rotation backwards and
>>calculate then the winddirection.
>>But: Is there an easier way to calculate it, without knowing the u and
>>v-component?
>>
>>Thanks for any hints
>>
>>Ronny
>>
>>
>>