我想在现有的一组Netcfd气候数据文件中添加一个包含Julian日期的附加变量。 我已经完成了一些python脚本,但它已经有一段时间了,所以我很生疏。阅读" netCDF4模块"文档我试图编写脚本来创建一个新的变量使用:
newvarJD= infile.create.Variable('Julian_Day','i4',
('lon','lat','time'))# attributes, varname,
dtype, dimensions=()
但我得到一个"属性错误:NetCDF:未找到属性"当它到达这一行时:
File" C:/WinPython64/WinPython-64bit-3.4.4.6Qt5/notebooks/netcfdfill.py" ;,第35行,在 newvarJD = infile.create.Variable(' Julian_Day',' i4',
所以,我认为需要声明维度,所以我更改了代码:
lat_nc = infile.dimensions['lat'] #define dimensions for create.variable
lon_nc = infile.dimensions['lon']
time_nc = infile.dimensions['time']
但是现在我收到一个新错误,上面写着KeyError:' lat'
我包括我对脚本的尝试,因为我想我还有几个错误。你能帮助我吗?
#**************************
# 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()
答案 0 :(得分:0)
该函数名为createVariable()
。您的代码应该可以使用该修复程序。
答案 1 :(得分:0)
这对我不起作用。问题是如下所示的分配。代替:
lat_nc = infile.dimensions['lat']
使用
lat_nc = infile.dimensions['lat'].name
,并确保在创建变量时不要在尺寸名称周围加上引号:
newvarJD= infile.createVariable('Julian_Day','i4',(lon_nc,lat_nc,time_nc))