Python - re-write a netcdf file after calculation

Question

I have a netcdf4 file called test.nc

I am calculating monthly median (from the daily values) with the following code:

import xarray as xr
os.chdir(inbasedir)
data = xr.open_dataset('test.nc')
monthly_data = data.resample(freq='m', dim ='time', how = 'median')

My question is how can I write this output to a new netcdf file, without having to re-write all the variables and the metadata already included in the input netcdf file.

Possible duplicate of How to create a netCDF file with python netCDF4? — user10614851
– user10614851, Commented Feb 22, 2019 at 15:49
@SilverNitrateIon - It's not a duplicate. In my question I simply search how to output the netCDF from an existing one without having to re-write the metadata, variables, already included in the original file. The duplicate you indicate is creating a netcdf file from scratch — steve
– steve, Commented Feb 22, 2019 at 15:51
I think there is no shortcut here and you need to copy all vars, dims and attrs: stackoverflow.com/questions/13936563/…. One alternative would be to use nccopy via subprocess — Jarek.D
– Jarek.D, Commented Feb 22, 2019 at 16:45

kmuehlbauer · Accepted Answer · 2019-02-22 16:47:56Z

3

Not sure if it is what you want. But this creates a new netcdf file from the created Dataset:

monthly_data.to_netcdf('newfile.nc')

You might use .drop() on the Dataset to remove data which you don't want in the output.

answered Feb 22, 2019 at 16:47

kmuehlbauer

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