[MITgcm-support] Convert data in latlon grid to cube-sphere grid

[Yuan Lian]

Hi Dimitris,

Thanks a lot! I have been wondering if the matlab functions are 
available for
latlon-to-cs conversion. I guess I didn't check the utils carefully.

Cheers,
Yuan

Dimitris Menemenlis wrote:
> Yuan, in MITgcm/utils/matlab/cs_grid there is a bunch of matlab 
> functions that are specific to cube-sphere grid.  In particular, 
> uvLatLon2cube.m will convert vectors from a lat/lon grid to cube sphere.
>
> For surface forcing fields, I suggest that you use exf_interp for 
> on-the-fly interpolation.  An example is in 
> MITgcm_contrib/high_res_cube/README.cs32
> I use bi-cubic interpolation for vector fields to avoid artifacts in 
> the gradients and bi-linear for everything else to avoid spurious 
> negative values.
>
> D.
>
> On Dec 23, 2008, at 5:09 AM, Yuan Lian wrote:
>
>> Hi Dimitris,
>>
>> I talked a little about this with Jean-Michel during AGU. I went to 
>> check your poster but you had left.
>> Anyway, I do need to convert the vector field as well. For example, I 
>> want to use wind field from
>> observation data as initial condition. Will the bilinear 
>> interpolation cause any trouble here (e.g. cell centered
>> to a standard C-grid)? I am thinking about making some matlab scripts 
>> to do the trick. Any hint here?
>> Thanks a lot for your help!
>>
>> Cheers,
>> Yuan
>>
>> Dimitris Menemenlis wrote:
>>> Yuan, did anybody get back to you?  Going from latlon to cube sphere 
>>> for a scalar field is easy.  You can just use bilinear 
>>> interpolation, for example, function "interp2" in matlab.  For 
>>> vector fields it's a bit trickier but MITgcm can do that on the 
>>> fly.  Dimitris
>>>
>>> On Dec 3, 2008, at 7:17 PM, Yuan Lian wrote:
>>>
>>>> Hi,
>>>>
>>>> I am trying to generate topography files in cube-sphere grid. The 
>>>> original data
>>>> is in latlon grid. More generally, is there anyway I can convert 
>>>> the data in latlon grid to
>>>> cube-sphere grid? Are there any Matlab scripts available? Thanks!
>>>>
>>>> Regards,
>>>> Yuan
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>>
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