[ncl-talk] How to convert netcdf to grib format
Arunima Singh
arunima at vassarlabs.com
Mon Feb 13 03:39:04 MST 2017
Hi,
I am running following command -
cdo -f grb setgrid,mygrid DET_10N20N_76E85E_2016111712.nc
DET_10N20N_76E85E_2016111712.grib
But getting following error:
Warning (cgribexDefGrid) : The CGRIBEX library can not store fields on the
used grid!
Error (cgribexDefGrid) : Unsupported grid type: generic
Am I doing something wrong, or is it because generic grid type is not
supported.
PFA files for reference.
Is there any other way to convert netcdf to grib2 format.
SAMPLE FILES:
*mygrid* file ::
gridtype = generic
xsize = 73
ysize = 81
xfirst = 76
xinc = 0.005
yfirst = 20
yinc = 0.005
*cdo griddes output*::
#
# gridID 1
#
gridtype = generic
gridsize = 81
xsize = 81
#
# gridID 2
#
gridtype = generic
gridsize = 73
xsize = 73
#
# gridID 3
#
gridtype = generic
gridsize = 5913
xsize = 73
ysize = 81
cdo griddes: Processed 10 variables ( 0.00s )
*NetCDF file*::
latitude = 20, 19.875, 19.75, 19.625, 19.5, 19.375, 19.25, 19.125, 19,
18.875, 18.75, 18.625, 18.5, 18.375, 18.25, 18.125, 18, 17.875, 17.75,
17.625, 17.5, 17.375, 17.25, 17.125, 17, 16.875, 16.75, 16.625, 16.5,
16.375, 16.25, 16.125, 16, 15.875, 15.75, 15.625, 15.5, 15.375, 15.25,
15.125, 15, 14.875, 14.75, 14.625, 14.5, 14.375, 14.25, 14.125, 14,
13.875, 13.75, 13.625, 13.5, 13.375, 13.25, 13.125, 13, 12.875, 12.75,
12.625, 12.5, 12.375, 12.25, 12.125, 12, 11.875, 11.75, 11.625, 11.5,
11.375, 11.25, 11.125, 11, 10.875, 10.75, 10.625, 10.5, 10.375, 10.25,
10.125, 10 ;
longitude = 76, 76.125, 76.25, 76.375, 76.5, 76.625, 76.75, 76.875, 77,
77.125, 77.25, 77.375, 77.5, 77.625, 77.75, 77.875, 78, 78.125, 78.25,
78.375, 78.5, 78.625, 78.75, 78.875, 79, 79.125, 79.25, 79.375, 79.5,
79.625, 79.75, 79.875, 80, 80.125, 80.25, 80.375, 80.5, 80.625, 80.75,
80.875, 81, 81.125, 81.25, 81.375, 81.5, 81.625, 81.75, 81.875, 82,
82.125, 82.25, 82.375, 82.5, 82.625, 82.75, 82.875, 83, 83.125, 83.25,
83.375, 83.5, 83.625, 83.75, 83.875, 84, 84.125, 84.25, 84.375, 84.5,
84.625, 84.75, 84.875, 85 ;
On Mon, Feb 13, 2017 at 3:44 PM, Arunima Singh <arunima at vassarlabs.com>
wrote:
> Hi,
>
> I am running following command -
> cdo -f grb setgrid,mygrid DET_10N20N_76E85E_2016111712.nc
> DET_10N20N_76E85E_2016111712.grib
>
> But getting following error:
> Warning (cgribexDefGrid) : The CGRIBEX library can not store fields on the
> used grid!
>
> Error (cgribexDefGrid) : Unsupported grid type: generic
>
> Am I doing something wrong, or is it because generic grid type is not
> supported.
> PFA files for reference.
>
> Is there any other way to convert netcdf to grib2 format.
>
> Thanks and Regards,
> Arunima Singh
>
> On Mon, Feb 13, 2017 at 1:30 PM, Beáta Szábo-Takács <szabo.b at czechglobe.cz
> > wrote:
>
>> Hi,
>>
>>
>> It hard to see the grid type by ncdump results. Can you apply Climate
>> Data Operator (CDO)? If yes, you can see the grid coordinates with the
>> sinfo or griddes operators:
>>
>>
>> cdo sinfo file.nc
>>
>>
>> cdo griddes file.nc
>>
>>
>> You can create mygrid file by the following way:
>>
>>
>> cat > mygrid << EOF
>>
>> gridtype =
>>
>> xsize =
>>
>> ysize =
>>
>> xfirst =
>>
>> xinc =
>>
>> yfirst =
>>
>> yinc =
>>
>> EOF
>>
>> I hope I could help you.
>>
>>
>> Beata
>>
>> ------------------------------
>> *From:* Arunima Singh <arunima at vassarlabs.com>
>> *Sent:* Monday, February 13, 2017 8:32:49 AM
>> *To:* Beáta Szábo-Takács
>> *Cc:* Barry Lynn; ncl-talk
>>
>> *Subject:* Re: [ncl-talk] How to convert netcdf to grib format
>>
>> 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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>>> Jerusalem, Israel
>>> Local: 02 930 9525
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>>> Int-IS: x972 2 930 9525
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>>>
>>>
>>>
>>>
>>>
>>
>>
>
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