Python xarray-将一个变量的值转换为数据集中另一个变量的标签

我有一个名为

ds\u ffdi

的xarray数据集。其中有两个变量

xarray.Dataset

Dimensions:     latitude: 148   longitude: 244   time: 424680
Coordinates:
    latitude    (latitude)     float32          -39.2 -39.163948 ... -33.9
    longitude   (longitude)    float32          140.8 140.83786 ... 149.96214 150.0
    time        (time)         datetime64[ns]   1972-01-20T00:00:00 ... 2020-06-30T23:00:00
Data variables:
    FFDI        (time, latitude, longitude)   float32   dask.array<chunksize=(288, 148, 244), meta=np.ndarray>
    REF_ID      (latitude, longitude)        int32       0 1 2 3 ... 36108 36109 36110 36111
Attributes:
    creationTime :        1611509008
    creationTimeString :  Sun Jan 24 09:23:28 PST 2021
    Conventions :         COARDS

xarray.Dataset

    Dimensions:     ref_id: 36111   time: 424680
    Coordinates:
        ref_id      (ref_id)        int32            0 1 2 3 ... 36108 36109 36110 36111
        time        (time)          datetime64[ns]   1972-01-20T00:00:00 ... 2020-06-30T23:00:00
    Data variables:
        FFDI        (time, ref_id)  float32