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  • Confusing handling of NetCDF coordinates · 6 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
494597663 https://github.com/pydata/xarray/issues/2976#issuecomment-494597663 https://api.github.com/repos/pydata/xarray/issues/2976 MDEyOklzc3VlQ29tbWVudDQ5NDU5NzY2Mw== djhoese 1828519 2019-05-21T23:36:21Z 2019-05-21T23:36:21Z CONTRIBUTOR

Rad doesn't include the "band_id" coordinate because "band_id" includes a "band" dimension, which isn't found on the Rad variable.

Ah, that's what I was looking for! Ok, that makes sense. To be as generic as possible xarray is using the dimensions to determine if a coordinate "belongs" to a variable rather than the "coordinates" attribute of that variable. I can live with that. Thanks for the explanation and the link to that part of the code.

 
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   Confusing handling of NetCDF coordinates 446722089
494590491 https://github.com/pydata/xarray/issues/2976#issuecomment-494590491 https://api.github.com/repos/pydata/xarray/issues/2976 MDEyOklzc3VlQ29tbWVudDQ5NDU5MDQ5MQ== shoyer 1217238 2019-05-21T23:03:34Z 2019-05-21T23:03:34Z MEMBER

Here's where you can find the logic for subsetting coordinates, by the way: https://github.com/pydata/xarray/blob/0811141e8f985a1f3b95ead92c3850cc74e160a5/xarray/core/dataset.py#L983-L986

 
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   Confusing handling of NetCDF coordinates 446722089
494590285 https://github.com/pydata/xarray/issues/2976#issuecomment-494590285 https://api.github.com/repos/pydata/xarray/issues/2976 MDEyOklzc3VlQ29tbWVudDQ5NDU5MDI4NQ== shoyer 1217238 2019-05-21T23:02:37Z 2019-05-21T23:02:37Z MEMBER

Looking more carefully, Rad doesn't include the "band_id" coordinate because "band_id" includes a "band" dimension, which isn't found on the Rad variable.

 
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   Confusing handling of NetCDF coordinates 446722089
494590102 https://github.com/pydata/xarray/issues/2976#issuecomment-494590102 https://api.github.com/repos/pydata/xarray/issues/2976 MDEyOklzc3VlQ29tbWVudDQ5NDU5MDEwMg== shoyer 1217238 2019-05-21T23:01:43Z 2019-05-21T23:01:43Z MEMBER

Can you print what the whole Dataset looks like?

 
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   Confusing handling of NetCDF coordinates 446722089
494589615 https://github.com/pydata/xarray/issues/2976#issuecomment-494589615 https://api.github.com/repos/pydata/xarray/issues/2976 MDEyOklzc3VlQ29tbWVudDQ5NDU4OTYxNQ== djhoese 1828519 2019-05-21T22:59:24Z 2019-05-21T22:59:24Z CONTRIBUTOR

Ok, but then why are coordinates that exist in the Dataset and in the netcdf variable's 'coordinates' attribute not listed in the DataArray for that variable?

 
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   Confusing handling of NetCDF coordinates 446722089
494587117 https://github.com/pydata/xarray/issues/2976#issuecomment-494587117 https://api.github.com/repos/pydata/xarray/issues/2976 MDEyOklzc3VlQ29tbWVudDQ5NDU4NzExNw== shoyer 1217238 2019-05-21T22:48:08Z 2019-05-21T22:48:08Z MEMBER

Xarray merges together coordinates from all data variables into a Dataset. As far as xarray is concerned, if you're a coordinate of one data variable, you're a coordinate of every data variable.

 
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   Confusing handling of NetCDF coordinates 446722089

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