2017-04-02 117 views
1

我想添加一個包含Julian日期的附加變量到現有的一組Netcfd氣候數據文件。 我已經做了一些python腳本,但它已經有一段時間了,所以我很生疏。閱讀「netCDF4模塊」的文件後,我試着寫腳本用來創建一個新的varaiable:使用Python將變量添加到現有的Netcdf4文件中

newvarJD= infile.create.Variable('Julian_Day','i4',          
           ('lon','lat','time'))# attributes, varname, 
                 dtype, dimensions=() 

,但我得到一個「AttributeError的:創建NetCDF:屬性未找到」當到達這條線:

文件 「C:/WinPython64/WinPython-64bit-3.4.4.6Qt5/notebooks/netcfdfill.py」,第35行,在 newvarJD = infile.create.Variable( 'JULIAN_DAY', '6-14',

所以,我認爲需要聲明尺寸,所以我改變了代碼:

lat_nc = infile.dimensions['lat'] #define dimensions for create.variable 
lon_nc = infile.dimensions['lon'] 
time_nc = infile.dimensions['time'] 

,但現在我得到一個新的錯誤,即KeyError異常:「緯度」

我包括我的腳本的嘗試,因爲我想象我有幾個錯誤。你能幫助我嗎?

#************************** 
# Access standard libraries 
#************************** 
from netCDF4 import Dataset 
import numpy as np 
import os 
# Set the input/output directories 
wrkDir = 'C:/Netcfd/BCSD/test' 
Minifile = wrkDir + '/tasmin' 

#*************************** 
# Add a Julian date variable to all *.nc file in directory 
#**************************** 



inList = os.listdir(Minifile) # List all the files in the 'tasmin' 
           directory 
print(inList) 

for fileName in inList:  # Step through each file 
    ifile = fileName 
    baseName, extension = os.path.splitext(ifile) 
    if extension == '.nc': 
     infile = Dataset("ifile", "r+", format="NETCDF4")#append to add 
                  Julian 
     lat_nc = infile.dimensions['lat'] #define dimensions for 
              create.variable 
     lon_nc = infile.dimensions['lon'] 
     time_nc = infile.dimensions['time'] 
     newvarJD= infile.create.Variable('Julian_Day','i4', 
             ('lon_nc','lat_nc','time_nc'))# 
               varname,dtype, dimensions=() 
     newvarJD.units= "Days" 
     newvarJD.long_name = 'Annual Julian Days' 

     JD = 0 # counter used to set Julian day value 
     for i in range(len(time_nc)): 
      JD = JD + 1 # start with Julina Day 1 
      newvarJD = np.asarray(infile[:,:,:,JD])# write data into the 
                variable created 
     print ('New NC dims ->'(infile.shape)) 
    infile.close()  

回答

0

該功能被稱爲createVariable()。您的代碼應該適用於該修補程序。

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