[ncl-talk] Regrid question

[Guilherme Martins]

Dear Dennis,

Thanks for you response. I'll check your comments.

Guilherme.


Em 20/10/2016 17:49, Dennis Shea escreveu:
>
> [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 
> <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 <mailto:jgmsantos at gmail.com>> wrote:
>
>     Hi users,
>
>     I have the files mcga.nc <http://mcga.nc> (variables: tems and
>     umrs) and REF_25km.AS.nc <http://REF_25km.AS.nc> (vegetation map).
>     I'd like to interpolate the mcga.nc <http://mcga.nc> file
>     (gaussian grid) to the same spatial resolution REF_25km.AS.nc
>     <http://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 <http://REF_25km.AS.nc> file.
>
>     The script and dataset can be downloaded at:
>
>     http://ftp-supercomputacao.inpe.br/public/jose.martins/regrid/
>     <http://ftp-supercomputacao.inpe.br/public/jose.martins/regrid/>
>
>     Thanks,
>
>     Guilherme Martins.
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Instituto Nacional de Pesquisas Espaciais (INPE)
Centro de Previsão de Tempo e Estudos Climáticos (CPTEC)
Divisão de Satélites Ambientais (DSA)
Programa de Monitoramento de Queimadas
Telefone (INPE/CP): +55 12 3208-9205 || Celular (TIM): +55 12 98152-8580
E-mail: guilherme.martins at inpe.br || jgmsantos at gmail.com
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