Convert NetCDF File To CSV Or Text Using Python

I'm trying to convert a netCDF file to either a CSV or text file using Python. I have read this post but I am still missing a step (I'm new to Python). It's a dataset including lat

Solution 1:

I think pandas.Series should work for you to create a CSV with time, lat,lon,precip.

import netCDF4
import pandas as pd

precip_nc_file = 'file_path'
nc = netCDF4.Dataset(precip_nc_file, mode='r')

nc.variables.keys()

lat = nc.variables['lat'][:]
lon = nc.variables['lon'][:]
time_var = nc.variables['time']
dtime = netCDF4.num2date(time_var[:],time_var.units)
precip = nc.variables['precip'][:]

# a pandas.Series designed for time series of a 2D lat,lon grid
precip_ts = pd.Series(precip, index=dtime) 

precip_ts.to_csv('precip.csv',index=True, header=True)

Solution 2:

import xarray as xr

nc = xr.open_dataset('file_path')
nc.precip.to_dataframe().to_csv('precip.csv')

Solution 3:

Depending on your requirements, you may be able to use Numpy's savetxt method:

import numpy as np

np.savetxt('lat.csv', lat, delimiter=',')
np.savetxt('lon.csv', lon, delimiter=',')
np.savetxt('precip.csv', precip, delimiter=',')

This will output the data without any headings or index column, however.

If you do need those features, you can construct a DataFrame and save it as CSV as follows:

df_lat = pd.DataFrame(data=lat, index=dtime)
df_lat.to_csv('lat.csv')

# and the same for `lon` and `precip`.

Note: here, I assume that the date/time index runs along the first dimension of the data.