创建变量以创建 netCDF 文件时出错 [英] Error when creating variable to create a netCDF file

问题描述

我能够计算出以下代码所示的经纬度维度声明.我想我已经接近获得 netCDF 文件了.但是，我收到一个错误.

I was able to figure out the lat, lon dimension declaration as indicated in the following code. I think I am close to obtain the netCDF file. But, I get an error.

import numpy as np
import netCDF4
import os

# load the data

path='C:\Users\.spyder2'
os.chdir(path)
# this load the file into a Nx3 array (three columns)
data = np.loadtxt('TRMM_1998_01_0100_newntcl.csv', delimiter=',')


# create a netcdf Data object

with netCDF4.Dataset('TEST_file.nc', mode="w", format='NETCDF4') as ds:
    # some file-level meta-data attributes:
    ds.Conventions = "CF-1.6" 
    ds.title = 'Non TC precipitation'
    ds.institution = 'USU'

    lat = data[:,0] # the first column 
    lon = data[:,1] # the second column 
    precip = data[:,2] # the third column 

    nlat = lat.reshape( (161, 321) )
    nlon = lon.reshape( (161, 321) )

    # time = ds.createDimension('time', 0)
    ds.createDimension('latitude', 161)
    ds.createDimension('longitude', 321)


    precip = ds.createVariable('precip', 'f4', ('latitude', 'longitude'))
    precip[:] = data[:,:]
    ## adds some attributes
    precip.units = 'mm'
    precip.long_name = 'Precipitation'

错误:

Traceback (most recent call last):

  File "<ipython-input-101-483efc7d87e2>", line 42, in <module>
    precip[:] = data[:,:]

  File "netCDF4.pyx", line 3066, in netCDF4.Variable.__setitem__ (netCDF4.c:38720)

  File "netCDF4.pyx", line 3177, in netCDF4.Variable._put (netCDF4.c:39523)

IndexError: size of data array does not conform to slice

如果您能在这里澄清一下或向我提供一些纠正方法的线索，我将不胜感激.

I appreciate if you can clarify here a bit or provide me some clues of what's happening to correct it.

提前致谢，

推荐答案

创建维度是在没有分配给变量的情况下完成的.只需在定义维度时删除 lat= 和 lon=，然后您就可以在创建变量时引用这些维度.

Creating dimensions is done with no assignment to a variable. Just remove the lat= and lon= when defining dimensions and then you can reference the dimensions while creating a variable.

ds.createDimension('latitude', 161)
ds.createDimension('longitude', 321)

precip = ds.createVariable('precip, 'f4', ('latitude', 'longitude',))

此外，当您在脚本中多次重复使用 lat 时，请注意范围问题.在处理实际数据、命名维度和维度大小时，最好使用唯一名称.我通常做一些类似lat_arr(用于数据)、nlat(用于尺寸大小)和lat 或latitude> 用于维度名称.

Also, be careful with scoping issues as you re-use lat several times in the script. Best to use unique names when dealing with the actual data, named dimensions, and dimension sizes. I usually do something like lat_arr (for the data), nlat (for dimension size), and lat or latitude for the dimension name.

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