[Python] multidimensional coordinate transform with xarray

How to convert multidimensional coordinate to standard coordinate in order to unify data when using xarray for nc data:

import xarray as xr

da = xr.DataArray(
[[0, 1], [2, 3]],
coords={
"lon": (["ny", "nx"], [[30, 40], [40, 50]]),
"lat": (["ny", "nx"], [[10, 10], [20, 20]]),
},
dims=["ny", "nx"],
)



except:

xr.DataArray(
[[0, 1, np.nan],
[np.nan, 2, 3]],
coords={
"lat": [10, 20],
"lon": [30, 40, 50],
})

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