[ncl-talk] ESMF_regrid on unstructured regional mesh

[Mary Haley]

Hi Laura,

Yes, you want to set:

opt at SrcRegional = True

and/or

opt at DstRegional = True

if your source and/or destination grids are regional.  I think all this
does internally is not treat the longitudes as going all the way from 0 to
360.

Depending on how you are doing things, you can also use DstLLCorner /
DstURCorner to further limit the area that the regridding occurs in.

For example, if you are regridding source data that falls only over the
tropical regions, but you tell it to regrid to a 1 degree grid, then the
regridder is going to regrid to a *global* 1 degree grid by default. This
could take needless extra time, because it will try to regrid to areas
where you may not have data.

To restrict the area of the 1 degree grid, you can set DstLLCorner /
DstURCorner to something like:

Opt at DstLLCorner       = (/ -30.,   0.25d/)
Opt at DstURCorner       = (/ 30., 359.75d/)

--Mary



On Mon, Nov 13, 2017 at 11:47 AM, Laura Fowler <laura at ucar.edu> wrote:

> Hello:
>
> I would to regrid data that are originally on an MPAS unstructured
> mesh but limited to the tropical channel. Longitudes span between 0
> and 360 degrees, but Latitudes span between 21S and 21N. I would like
> to regrid the data on a 0.1 deg x 0.1 deg rectangular mesh.
>
>
> I have use ESMF_regrid extensively to regrid MPAS data using the
> "global" unstructured mesh but not using a "regional" unstructured
> mesh. Is it possible to do this using ESMF_regrid? Do I need to use
> SrcRegional and DstRegional since the source, destination, and weight
> files will not be created from global data?
>
>
> Thanks,
> Laura
>
>
>
>
> --
> !-----------------------------------------------------------
> --------------------------------------------------
> Laura D. Fowler
> Mesoscale and Microscale Meteorology Division (MMM)
> National Center for Atmospheric Research
> P.O. Box 3000, Boulder CO 80307-3000
>
> e-mail: laura at ucar.edu
> phone: 303-497-1628
>
> !-----------------------------------------------------------
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