To convert a GRIB file, it is necessary to read it : (see Open CEMS-Flood Data. for more details)
Supposing you have downloded a GRIB file that you have named "download.grib", then it is possible to save it to disk converted into a NetCDF4 in the following way:
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You can use the Python executable below to perform the conversion from the terminal. Copy and paste the content of the code block below and save it in a python file called "grib_to_netcdf.py".
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import xarray as xr
import argparse
import sys
def convert(input, output):
try:
ds = xr.open_dataset(
input,
engine='cfgrib',
backend_kwargs={'indexpath':''}
)
except FileNotFoundError:
sys.exit("File was not found : {}".format(input))
ds.to_netcdf(output)
if __name__ == "__main__":
parser = argparse.ArgumentParser(description='GRIB to NetCDF converter\n',
formatter_class=argparse.RawTextHelpFormatter)
parser.add_argument('-i', dest='input', metavar='INPUT_FILE', required=True, help='INPUT_FILE')
parser.add_argument('-o', dest='output', metavar='OUTPUT_FILE', required=True, help='OUTPUT_FILE')
args = parser.parse_args()
convert(args.input,args.output)
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