[ncl-talk] How to convert netcdf to grib format

[Arunima Singh]

Hi,

Thanks .
Can you please tell me what to have in mygrid ?

My netcdf file has following variables :
netcdf DET_10N20N_76E85E_2016111712 {
dimensions:
lat = 81 ;
lon = 73 ;
time = 41 ;
variables:
float latitude(lat) ;
latitude:units = "degrees_north" ;
float longitude(lon) ;
longitude:units = "degrees_east" ;
float time(time) ;
time:units = "hours since 2016-11-17 12Z" ;
float \2m_temperature(time, lat, lon) ;
\2m_temperature:units = "C" ;
float \2m_relative_humidity(time, lat, lon) ;
\2m_relative_humidity:units = "%" ;
float mean_sea_level_pressure(time, lat, lon) ;
mean_sea_level_pressure:units = "Pa" ;
float \6hr_accumulated_precip(time, lat, lon) ;
\6hr_accumulated_precip:units = "mm" ;
float \10m_U_wind(time, lat, lon) ;
\10m_U_wind:units = "m/s" ;
float \10m_V_wind(time, lat, lon) ;
\10m_V_wind:units = "m/s" ;
float wind_magnitude(time, lat, lon) ;
wind_magnitude:units = "m/s" ;
float wind_direction(time, lat, lon) ;
wind_direction:units = "degrees" ;
}


On Mon, Feb 13, 2017 at 12:56 PM, Beáta Szábo-Takács <szabo.b at czechglobe.cz>
wrote:

> Hi,
>
> According to CDO support:
>
> The grid type *generic* means that the variables have either no grid
> information or the grid information is not supported in CDO.
> In both cases it is not possible to store the data in GRIB format. Here is
> a list of all supported CDO GRIB grid types:
>
>    - Latitude/longitude grid
>    - Lambert conformal grid
>    - Gaussian latitude/longitude grid
>    - Rotated latitude/longitude grid
>    - Spherical Harmonic Coefficients
>    - Icosahedral-hexagonal GME grid
>
> You have to add the missing grid information with setgrid if there is no
> grid information in your file and the variables are stored on one of the
> above grids:
>
> cdo -f grb setgrid,mygrid cc.nc cc.grb
>
> You can check the grid information of the variables with the CDO function
> sinfo or griddes.
>
>
>
> I hope I could help you.
>
>
>
> Beata
>
>
>
>
>
> *From:* Arunima Singh [mailto:arunima at vassarlabs.com]
> *Sent:* Monday, February 13, 2017 8:16 AM
> *To:* Beáta Szábo-Takács <szabo.b at czechglobe.cz>
> *Cc:* Barry Lynn <barry.h.lynn at gmail.com>; ncl-talk <ncl-talk at ucar.edu>
>
> *Subject:* Re: [ncl-talk] How to convert netcdf to grib format
>
>
>
> I tried cdo -
>
> cdo -f grb copy DET_10N20N_76E85E_2016111712.nc
> DET_10N20N_76E85E_2016111712.grib
>
>
>
> but i am getting following error :
>
>
>
> Warning (cgribexDefGrid) : The CGRIBEX library can not store fields on the
> used grid!
>
>
>
> Error (cgribexDefGrid) : Unsupported grid type: generic
>
>
>
>
>
> On Mon, Feb 13, 2017 at 12:40 PM, Beáta Szábo-Takács <
> szabo.b at czechglobe.cz> wrote:
>
> Hi,
>
>
>
> I think you can convert netcdf to grib by CDO. Try the following operator:
>
>
>
> cdo -f grb copy file.nc file.grb
>
>
>
> I hope it helps.
>
>
>
> Beata
>
>
>
> *From:* ncl-talk-bounces at ucar.edu [mailto:ncl-talk-bounces at ucar.edu] *On
> Behalf Of *Arunima Singh
> *Sent:* Monday, February 13, 2017 8:05 AM
> *To:* Barry Lynn <barry.h.lynn at gmail.com>
> *Cc:* ncl-talk <ncl-talk at ucar.edu>
> *Subject:* Re: [ncl-talk] How to convert netcdf to grib format
>
>
>
> Hi,
>
>
>
> What i want is netcdf to grib2 format instead of grib to netcdf.
>
>
>
> Thanks and Regards,
>
> Arunima Singh
>
>
>
>
>
> On Mon, Feb 13, 2017 at 12:31 PM, Barry Lynn <barry.h.lynn at gmail.com>
> wrote:
>
> Hi:
>
>
>
> I believe you can find the answer here:
>
>
>
> http://www.ncl.ucar.edu/Applications/griball.shtml
>
>
>
> On Mon, Feb 13, 2017 at 8:56 AM, Arunima Singh <arunima at vassarlabs.com>
> wrote:
>
> Hi,
>
>
>
> I have one netcdf file that i want to convert to grib format.
>
> Can we do this conversion with ncl?
>
>
>
> If yes, how?
>
>
>
> Thanks and Regards,
>
> Arunima Singh
>
>
>
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>
>
>
>
> --
>
> Barry H. Lynn, Ph.D
>
> Senior Lecturer,
>
> The Institute of the Earth Science,
> The Hebrew University of Jerusalem,
> Givat Ram, Jerusalem 91904, Israel
>
> Tel: 972 547 231 170
> Fax: (972)-25662581
>
>
>
> C.E.O, Weather It Is, LTD
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>
>
>
>
>
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