issue_comments: 457907278

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https://github.com/pydata/xarray/issues/1475#issuecomment-457907278 https://api.github.com/repos/pydata/xarray/issues/1475 457907278 MDEyOklzc3VlQ29tbWVudDQ1NzkwNzI3OA== 1197350 2019-01-27T10:49:07Z 2019-01-27T10:49:19Z MEMBER

I'm not sure I understand (N,M) sized coordinates for unstructured meshes -- what is M here? The total number of cells? Some arbitrary constant indicating the maximum number of sides for a single cell?

N is the number of cells. M is the number of points required to specify the cell vertices, e.g. 4 for 2D quadmesh, 3 for 2D trimesh, 8 for 3D quadmesh, etc.

Regarding your options 1 or 2, I guess I'm agnostic as to how it is implemented. I recognize 2 introduces lots of complications. What matters is how it will interact the indexes, i.e. can we easily select data based on cell bounds?

I will have to take some time to think about what you wrote, as it is hard for my brain... 🙃 

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