issue_comments: 630644504

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https://github.com/pydata/xarray/issues/4077#issuecomment-630644504 https://api.github.com/repos/pydata/xarray/issues/4077 630644504 MDEyOklzc3VlQ29tbWVudDYzMDY0NDUwNA== 10194086 2020-05-19T07:40:11Z 2020-05-19T07:40:11Z MEMBER

Yes, xr.combine_by_coords only ensures that the coordinates are monotonically increasing. It does not check that they (a) don't have the same start (your case) and (b) if the end of ds0 is equal to the start of ds1 (which may also be undesirable).

The magic happens here:

https://github.com/pydata/xarray/blob/2542a63f6ebed1a464af7fc74b9f3bf302925803/xarray/core/combine.py#L49

In your case it just uses the rightmost array (compare xr.combine_by_coords([ds0, ds1]) and xr.combine_by_coords([ds1, ds0]).

(Note that concat_dim="y" is ignored when using combine_by_coords).

 
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