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新陣列的總大小必須保持不變(netCDF)

[英]Total Size of New Array Must Be Unchanged (netCDF)

我在將CSV文件轉換為NetCDF時遇到問題。 我在python中使用numpy和netCDF4嘗試實現這一目標。

錯誤:

Traceback (most recent call last):
File "csv2nc.py", line 47, in <module>
tmaxsfc[:] = temps
File "netCDF4.pyx", line 3167, in netCDF4.Variable.__setitem__ (netCDF4.c:39349)
ValueError: total size of new array must be unchanged

腳本:

import numpy as np
import netCDF4

data = np.loadtxt('/home/weather/Dropbox/d0_tmaxs', delimiter=',', skiprows=0)

temp = data[:,1]
lat = data[:,2]
lon = data[:,3]

with netCDF4.Dataset('tmaxsfc.nc', mode="w", format='NETCDF4') as ds:
# some file-level meta-data attributes:
ds.Conventions = "CF-1.6"
ds.title = 'Maximum Temperature values for Day 0'
ds.institution = 'weather'
ds.source = ''

#print(lon.shape)

lats = np.array(lat,np.float32).reshape(255)
lons = np.array(lon,np.float32).reshape(255)
temps = np.array(temp,np.float32).reshape(255)

ds.createDimension('latitude', 255)
ds.createDimension('longitude', 255)

tmaxsfc = ds.createVariable('tmaxsfc', 'f4', ('latitude', 'longitude',))
tmaxsfc[:] = temps
tmaxsfc.units = 'F'
tmaxsfc.long_name = 'Temperature'

d0_tmaxs文本文件示例:

20160226,40,36.65408,-83.21783
20160226,35.1508,41.00928,-74.73628
20160226,31,43.77714,-71.75598
20160226,23.8302,44.41944,-72.01944
20160226,22,39.5803,-79.3394

對於它的價值,文本文件有255行。 我究竟做錯了什么?

我對netcdf有點生疏,但沒有

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

意思是tmaxsfc是一個二維數組,255乘255? 您是在經度緯度網格上定義它的。

但是看起來您的輸入將顯示在散點圖上,共255個點,每個點由緯度,經度和溫度定義。

因此,錯誤來自於temp是具有255個元素的1D數組,但是tmaxsfc變量被定義為2D變量。 您想要做的是創建一個單一的維度(例如station ),所有3個1D變量都可以是以下函數:

import numpy as np
import netCDF4

data = np.loadtxt('/home/weather/Dropbox/d0_tmaxs', delimiter=',', skiprows=0)

temp = np.array(data[:,1], dtype=np.float32).reshape(255)
lat = np.array(data[:,2], dtype=np.float32).reshape(255)
lon = np.array(data[:,3], dtype=np.float32).reshape(255)

with netCDF4.Dataset('tmaxsfc.nc', mode="w", format='NETCDF4') as ds:
    # some file-level meta-data attributes:
    ds.Conventions = "CF-1.6"
    ds.title = 'Maximum Temperature values for Day 0'
    ds.institution = 'weather'
    ds.source = ''

    ds.createDimension('station', 255)
    dims = ('station',)

    tmaxsfc = ds.createVariable('tmaxsfc', np.float32, dims) 
    tmaxsfc[:] = temps
    tmaxsfc.units = 'F'
    tmaxsfc.long_name = 'Temperature'

    lon_var = ds.createVariable('longitude', np.float32, dims)
    lon_var[:] = lon
    lon.units = 'degrees_east'

    lat_var = ds.createVariable('latitude', np.float32, dims)
    lat_var[:] = lat
    lat.units = 'degress_north'

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