[MITgcm-support] cubed sphere

[Martin Losch]

Hi Elja,

the XC/YC/XG/YG are the geographical coordinates (in degrees) of the  
cell centers (C) and lower left cell corners (G) of the model grid  
(cubed sphere). So if you have a formula that computes a (scalar)  
quantity as a function of longitude and latitude, you can just use  
the above coordinates. If you want to compute vector quantities on  
the cubed sphere grid, things become a little more involved as you  
have to take into account the orientation of the grid and rotate your  
vectors accordingly.

Does this answer your question?

Martin

On 4 May 2008, at 21:26, Elja Huibregtse wrote:

> Dear all,
>
> Currently, I am working with the cubed sphere coordinates.  
> Considering this coordinate system, I have some questions:
> - Are the coordinates, XC and YC, provided by 'grid_cs32.face00 
> [n].bin' (with n=1..6), spherical coordinates or cubed sphere  
> coordinates?
> - I have a formula in spherical coordinates. Do I have to transform  
> this formula to cubed sphere coordinates? If yes, how do I  
> transform back and forth, between spherical and cubed sphere  
> coordinates? Is there any difference between the faces?
> I found the article 'The Cubed Sphere' by C. Ronchi et all which  
> presents transformation matrices. However, I can not fix it.
>
> I appreciate your help!
> Regards,
> Elja
>
>
>
>
>
>
>
>
> _______________________________________________
> MITgcm-support mailing list
> MITgcm-support at mitgcm.org
> http://mitgcm.org/mailman/listinfo/mitgcm-support