尝试使用xarray将metpy计算的输出写入netcdf文件时出错:
TypeError: Argument 'data' has incorrect type (expected numpy.ndarray, got Quantity)
这似乎是metpy包含单位信息的结果,并将变量的数据转换为一品脱数量,而不是np.ndarray,但我想不出一种方法来在保持xarray的同时在两者之间进行转换(我想这样做是为了维护坐标数据)
以下是示例代码(使用NCEP气温再分析):
import xarray as xr
import metpy.calc as mpcalc
data = xr.open_dataset('air.2005.nc')
data['theta'] = mpcalc.potential_temperature(data['level'], data['air'])
data.to_netcdf('theta.2005.nc')
这会产生以下错误:
TypeError: Argument 'data' has incorrect type (expected numpy.ndarray, got Quantity)
完成θ计算后,数据如下所示:
<xarray.Dataset>
Dimensions: (lat: 91, level: 17, lon: 180, time: 365)
Coordinates:
* time (time) datetime64[ns] 2005-01-01 2005-01-02 ... 2005-12-31
* lon (lon) float64 -180.0 -178.0 -176.0 -174.0 ... 174.0 176.0 178.0
* lat (lat) float64 -90.0 -88.0 -86.0 -84.0 -82.0 ... 84.0 86.0 88.0 90.0
* level (level) float32 1e+03 925.0 850.0 700.0 ... 50.0 30.0 20.0 10.0
Data variables:
air (time, level, lat, lon) float32 ...
theta (level, time, lat, lon) float32 <Quantity([[[[272.32 272.32 ...
Attributes:
CDI: Climate Data Interface version 1.9.8 (https://mpimet.mpg....
Conventions: COARDS
history: Wed Nov 25 14:51:47 2020: cdo remap,twoDegreeGrid,remapwe...
title: 4x daily NMC reanalysis (2005)
description: Data is from NMC initialized reanalysis\n(4x/day). It co...
platform: Model
References: http://www.esrl.noaa.gov/psd/data/gridded/data.ncep.reana...
dataset_title: NCEP-NCAR Reanalysis 1
CDO: Climate Data Operators version 1.9.8 (https://mpimet.mpg....
是否可以从metpy计算中获取输出,以写入netCDF
我已经完全无法重现你遇到的错误,虽然我知道这在一定程度上是个问题,所以你可能想考虑将你的MePy、XARDATE、NUMPY和PUNT版本更新到最新的可用版本。p>
但是,如果没有这一点,正如MetPy的Xarray tutorial中所指出的,您应该能够做到:
将持有
Quantity
实例的所有DataArray
转换回它们的基本(支持numpy数组的)版本相关问题 更多 >
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