issue_comments: 422947647

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https://github.com/pydata/xarray/pull/2398#issuecomment-422947647 https://api.github.com/repos/pydata/xarray/issues/2398 422947647 MDEyOklzc3VlQ29tbWVudDQyMjk0NzY0Nw== 1197350 2018-09-19T20:30:58Z 2018-09-19T20:30:58Z MEMBER

I agree that the features implemented here are broadly useful and belong in xarray. The fundamental question is: how far does xarray itself want to go in supporting vector calculus in curvilinear coordinates (i.e. on the sphere).

There is a fair bit of overlap between this new functionality and some of the things that we are trying to do in xgcm: https://xgcm.readthedocs.io/en/latest/grids.html. Xgcm supports periodic boundary conditions, as well as more complex topological connections between array edges. It allows users to reproduce precisely the sort of operations used to take gradients in finite-volume staggered-grid models.

 
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