DESCRIPTION
Convert GRIB file(s) to netCDF format.
The only supported geometries for this feature are regular lat/lon grid or regular Gaussian (the key "typeOfGrid
" should be "regular_ll
" or "regular_gg
")
If you are retrieving the data from our archive, check the following article for more information about how to obtain it interpolated to those grids by using the "grid" keyword: grid - keyword in MARS/Dissemination request
USAGE
grib_to_netcdf [options] -o output_file grib_file grib_file ...
OPTIONS
-I key1,key2,...
Ignore keys. Default method,type,stream,refdate,hdate
-S key1,key2,...
Split according to keys. Default param,expver
-R date
Reference date in the format YYYYMMDD. Default value 19000101.
-D NC_DATATYPE
Type of data. Possible values NC_BYTE, NC_SHORT, NC_INT, NC_FLOAT, NC_DOUBLE.
Default NC_SHORT
-T
Don't use time of validity.
-f
Force. Force the execution not to fail on error.
-o output_file
The name of the netCDF output file.
-V
Version.
-M
Multi-field support off. Turn off support for multiple fields in single GRIB message.
-k kind
Specifies the kind of file to be created. Possible values are:
1 -> netCDF classic file format
2 -> netCDF 64 bit classic file format (Default)
3 -> netCDF-4 file format
4 -> netCDF-4 classic model file format
-d level
Deflate data (compression level). Only for netCDF-4 output format. Possible values [0,9]. Default None. Chunking strategy based on GRIB message.
-s
Shuffle data before deflation compression.
-u dimension
Set dimension to be an unlimited dimension.
grib_to_netcdf examples
Produce a NetCDF file from GRIB edition 1
> grib_to_netcdf -o output.nc input.grib1
If your grib file has analysis and 6-hour forecast, then ignore keys 'type' and 'step'. Thus type=an/fc and step=00/06 will not be considered as netCDF dimensions.
> grib_to_netcdf -I type,step -o output.nc input.grib
Do not use time of validity. If time of validity is used, it means the 1D time coordinate is considered as date+time+step, otherwise 3 different dimensions are created. The default behaviour is to use the time of validity.
> grib_to_netcdf -T -o output.nc input.grib
Produce netCDF with data type of FLOAT (32bit floating-point, for higher precision). Note these types were chosen to provide a reasonably wide range of trade-offs between data precision and number of bits required for each value
> grib_to_netcdf -D NC_FLOAT -o output.nc input.grib
Set the netCDF dimension 'time' to be unlimited i.e. time can have unlimited length so variables using this dimension can grow along this dimension.
> grib_to_netcdf -u time -o output.nc input.grib