[ncl-talk] Regrid question
Guilherme Martins
jgmsantos at gmail.com
Thu Oct 20 15:39:14 MDT 2016
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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