[ncl-talk] Calculate Relative Vorticity with uv2vr_cfd

[Dennis Shea]

NCL does not have an explicit function to calculate vorticity and/or
divergence for curvilinear grids.

Rick suggested:    *https://www.ncl.ucar.edu/Applications/regrid.shtml
<https://www.ncl.ucar.edu/Applications/regrid.shtml>*
Specifically: *rcm2rgrid_Wrap *
<https://www.ncl.ucar.edu/Document/Functions/Contributed/rcm2rgrid_Wrap.shtml>
Then, if you want to place the values on the original WRF grid:
*rgrid2rcm_Wrap*
<https://www.ncl.ucar.edu/Document/Functions/Contributed/rgrid2rcm_Wrap.shtml>

=====================
More complicated but more efficient:

*https://www.ncl.ucar.edu/Applications/ESMF.shtml*
<https://www.ncl.ucar.edu/Applications/ESMF.shtml>
*ESMF_regrid_29.ncl / ESMF_wgts_29.ncl*
also
*ESMF_regrid_37.ncl *

Good Luck
D

On Wed, Sep 4, 2019 at 8:58 PM Rick Brownrigg via ncl-talk <
ncl-talk at ucar.edu> wrote:

> Hi,
>
> I'm not expert at this, so I can only offer limited help. There are a
> number of options available to regrid your WRF curvilinear grid into a
> rectilinear grid as required by uv2vr_cfd
> <https://www.ncl.ucar.edu/Document/Functions/Built-in/uv2vr_cfd.shtml>;
> check out:
>
>     https://www.ncl.ucar.edu/Applications/regrid.shtml
>
> Perhaps someone can provide more specific help
>
> Rick
>
>
>
> On Wed, Sep 4, 2019 at 4:59 PM Hiram Abif Meza Landero via ncl-talk <
> ncl-talk at ucar.edu> wrote:
>
>> Hello
>> I would like to use the function uv2vr_cfd
>> <https://www.ncl.ucar.edu/Document/Functions/Built-in/uv2vr_cfd.shtml> to
>> calculate relative vorticity from wrf output but it needs one dimensional
>> arrays for latitude and longitude. Since the latitude and longitude output
>> from wrf is multidimensional, I need them on one dimensional array. Is
>> there a function in ncl to convert matrix to vector or something like that?
>>
>> Thank you
>> My best regards
>> Hiram
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