Python使用xarray从NETCDF文件中提取多个lat/long

Python使用xarray从NETCDF文件中提取多个lat/long,python,pandas,netcdf,python-xarray,data-extraction,Python,Pandas,Netcdf,Python Xarray,Data Extraction,我有一个NC文件time,lat,long,我正在尝试提取多个站点lat/long点的时间序列。 因此,我尝试通过这种方式读取坐标并从NC文件中提取最接近的值: import pandas as pd import xarray as xr nc_file = r"C:\Users\lab\Desktop\harvey\example.nc" NC = xr.open_dataset(nc_file) csv = r"C:\Users\lab\Desktop\harvey\stations.cs

我有一个NC文件time,lat,long,我正在尝试提取多个站点lat/long点的时间序列。 因此,我尝试通过这种方式读取坐标并从NC文件中提取最接近的值:

import pandas as pd
import xarray as xr
nc_file = r"C:\Users\lab\Desktop\harvey\example.nc"
NC = xr.open_dataset(nc_file)
csv = r"C:\Users\lab\Desktop\harvey\stations.csv"
df = pd.read_csv(csv,delimiter=',')
Newdf = pd.DataFrame([])
# grid point lists
lat = df["Lat"]
lon = df["Lon"]
point_list = zip(lat,lon)
for i, j in point_list:
    dsloc = NC.sel(lat=i,lon=j,method='nearest')
    DT=dsloc.to_dataframe()
    Newdf=Newdf.append(DT,sort=True)
代码工作正常,并返回以下内容:

                        EVP     lat      lon
time                                        
2019-01-01 19:00:00  0.0546  40.063  -88.313
2019-01-01 23:00:00  0.0049  40.063  -88.313
2019-01-01 19:00:00  0.0052  41.938  -93.688
2019-01-01 23:00:00  0.0029  41.938  -93.688
2019-01-01 19:00:00  0.0101  52.938 -124.938
2019-01-01 23:00:00  0.0200  52.938 -124.938
2019-01-01 19:00:00  0.1644  39.063  -79.438
2019-01-01 23:00:00 -0.0027  39.063  -79.438
但是,我需要将每个坐标的原始lat/long文件中的桩号ID关联起来,如下所示:

  Station-ID       Lat        Lon            time     EVP     lat      lon
0        Bo1  40.00620  -88.29040  1/1/2019 19:00  0.0546  40.063  -88.313
1                                  1/1/2019 23:00  0.0049  40.063  -88.313
2        Br1  41.97490  -93.69060  1/1/2019 19:00  0.0052  41.938  -93.688
3                                  1/1/2019 23:00  0.0029  41.938  -93.688
4        Brw  71.32250 -156.60917  1/1/2019 19:00  0.0101  52.938 -124.938
5                                  1/1/2019 23:00  0.0200  52.938 -124.938
6        CaV  39.06333  -79.42083  1/1/2019 19:00  0.1644  39.063  -79.438
7                                  1/1/2019 23:00 -0.0027  39.063  -79.438

有没有想过如何像所提供的示例那样合并我的数据帧?

如果在zip命令中包含站点名称,然后像这样将ID插入pandas数据帧行中呢?顺便说一句,我无法访问您的CSV文件,因此我使用虚拟列表稍微简化了示例

import pandas as pd
import xarray as xr
nc_file = "example.nc"
NC = xr.open_dataset(nc_file)

#dummy locations and station id as I can't access the CSV
lat=[40,42,41]
lon=[-100,-105,-99]
name=["a","b","c"]

Newdf = pd.DataFrame([])

for i,j,id in zip(lat,lon,name):
    dsloc = NC.sel(lat=i,lon=j,method='nearest')
    DT=dsloc.to_dataframe()

    # insert the name with your preferred column title:
    DT.insert(loc=0,column="station",value=id)
    Newdf=Newdf.append(DT,sort=True)

print(Newdf)
这给了我:

                        EVP     lat      lon station
time                                                
2019-01-01 19:00:00  0.0527  39.938  -99.938       a
2019-01-01 23:00:00  0.0232  39.938  -99.938       a
2019-01-01 19:00:00  0.0125  41.938 -104.938       b
2019-01-01 23:00:00  0.0055  41.938 -104.938       b
2019-01-01 19:00:00  0.0527  40.938  -98.938       c
2019-01-01 23:00:00  0.0184  40.938  -98.938       c

这主意不错!是的,使用Id压缩并插入到数据框架非常有效。谢谢你。是的,一旦我获得了15个声誉,我就会参加投票。现在我投票,但直到我获得了15个声誉,它才显示出来!我不知道!顺便说一下,欢迎来到stackexchange