Summary of various ways to read nc files in Python

Preface

In Python, there are many ways to read NetCDF (.nc) document. Common methods include using the following libraries:

1. netCDF4

This is one of the most commonly used libraries that provide the ability to directly read, write and process NetCDF files. It supports NetCDF file formats for version 3 and version 4.

Install：

pip install netCDF4

usage：

import netCDF4 as nc

# Open the filedataset = ('')

# View the dimensions of the fileprint(())

# View file variablesprint(())

# Read variable datatemp_data = ['temperature'][:]
()

2. xarray

xarrayIt is a very powerful library suitable for processing multidimensional data. It's withnetCDF4The library is compatible and provides advanced operational capabilities.

Install：

pip install xarray

usage：

import xarray as xr

# Read NetCDF filesds = xr.open_dataset('')

# View variables in the datasetprint(ds)

# Access data of a variabletemp_data = ds['temperature'].values

# Close the dataset()

3. h5py

NetCDF 4's file format is based on HDF5, so you can also useh5pyto process NetCDF 4 files, although this method is more underlying.

Install：

pip install h5py

usage：

import h5py

# Open NetCDF4 filefile = ('', 'r')

# View file contentprint(list(()))

# Read datadata = file['/temperature'][:]
()

4. SciPy

SciPy also provides basic support for NetCDF files, although its functionality is relatively limited and is mainly used to process older NetCDF 3 files.

Install：

pip install scipy

usage：

from  import netcdf

# Open the filefile = netcdf.netcdf_file('', 'r')

# Read variable datatemp_data = ['temperature'].data
()

5. Pseudonetcdf

If you need to deal with non-standard NetCDF file formats, you can usePseudonetcdf。

Install：

pip install Pseudonetcdf

usage：

import PseudoNetCDF as pnc

# Open the filencfile = ('', format='ioapi')

# Read variablestemp_data = ['temperature'][:]

Different methods have their own advantages and disadvantages. If advanced processing of multidimensional data is required,xarrayIt is a good choice; if it is just a simple read or write,netCDF4Library is the most direct choice.

Summarize

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