python 将 OpenDap 加载到 NetcdfFile

Question

我正在使用 URL 从 opendap 服务器(数据的子集)打开 netcdf 数据。当我打开它时，数据(据我所知)在请求变量之前实际上并未加载。我想将数据保存到磁盘上的文件中，我该怎么做？

我目前有:

import numpy as np
import netCDF4 as NC

url = u'http://etc/etc/hourly?varname[0:1:10][0:1:30]'
set = NC.Dataset(url) # I think data is not yet loaded here, only the "layout"
varData = set.variables['varname'][:,:] # I think data is loaded here

# now i want to save this data to a file (for example test.nc), set.close() obviously wont work

希望有人帮忙，谢谢!

Answer 1

如果你可以使用 xarray，这应该工作如下:

import xarray as xr

url = u'http://etc/etc/hourly?varname[0:1:10][0:1:30]'
ds = xr.open_dataset(url, engine='netcdf4')  # or engine='pydap'
ds.to_netcdf('test.nc')

xarray documentation还有另一个示例说明如何执行此操作。