[ncl-talk] Regrid question

[Dennis Shea]

[1]
The 'tems' and 'umrs'  variables have the attribute 'gaussian' on input.

       float tems(time, lat, lon) ;
                tems:code = 188 ;
                tems:table = 254 ;
                tems:grid_type = "gaussian" ;
        float umrs(time, lat, lon) ;
                umrs:code = 226 ;
                umrs:table = 254 ;
                umrs:grid_type = "gaussian" ;

I suggest deleting this upon input. This is *informational only*.

    tems = f->tems
    delete(tems at grid_type)
    umrs = f->umrs
    delete(umrs at grid_type)

+++++=====>  prevents a *_Wrap from copying it over.

===

Note:  I would suspect that area_conserve_remap_Wrap is *not* recommended
for this application.
This function was written by a model developer who created it for global
gaussian grids with no _FillValue.
It was modified to handle regional grids.

However, I'll offer a few comments:
area_conserve_remap_Wrap(in_lon,in_lat,in_wyearmean,g_lon,g_lat,False)

Your last argument is 'False'. You have regional grids. Hence, 'False' is
*not* appropriate. To use this function, I think you must have:
    opt = True
    opt at nlat  = 320
    opt at mlon= 640
area_conserve_remap_Wrap(in_lon,in_lat,in_wyearmean,g_lon,g_lat, opt)


====
I suggest using ESMF regridding

http://www.ncl.ucar.edu/Applications/ESMF.shtml

I have slightly modified e the examples. See attached.

[1] regrid.esmf_01.ncl:
Generate the weight file using one variable. This plots
'before'-and-'after' pics

[2] regrid.esmf_02.ncl
Use the weight file generated in [1] to regrid all specified variables.
Create netCDF

Dood luc;


On Wed, Oct 19, 2016 at 11:01 AM, Guilherme Martins <jgmsantos at gmail.com>
wrote:

> Hi users,
>
> I have the files mcga.nc (variables: tems and umrs) and REF_25km.AS.nc
> (vegetation map). I'd like to interpolate the mcga.nc file (gaussian
> grid) to the same spatial resolution REF_25km.AS.nc (regular grid) file.
> I wrote a script but the result (netcdf file) show me that the new
> variables still are in a gaussian grid and I want a regular grid equal to
> the REF_25km.AS.nc file.
>
> The script and dataset can be downloaded at:
>
> http://ftp-supercomputacao.inpe.br/public/jose.martins/regrid/
>
> Thanks,
>
> Guilherme Martins.
> --
> ------------------------------------------------------------
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