issue_comments: 420474101

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https://github.com/pydata/xarray/pull/2398#issuecomment-420474101 https://api.github.com/repos/pydata/xarray/issues/2398 420474101 MDEyOklzc3VlQ29tbWVudDQyMDQ3NDEwMQ== 6815844 2018-09-12T00:49:23Z 2018-09-12T00:49:23Z MEMBER

Thanks, @dopplershift .

Aren't you taking differences of values and dividing by differences between the matching coordinates?

Yes, correct. But if we have closer data points, then the estimate of the gradient becomes more precise. Sorting the array according to the coordinate provides the closest points, resulting in the most precise estimate of the gradient.

But I also think users can do it manually before taking the gradient. 

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