Regridding introduces missing values at wraparound longitude

[spencerahill]

See this gist for details: https://gist.github.com/anonymous/7e5dcfc3d84938266ddc1c2159770823

Entirely possible I'm making a silly mistake, but I can't figure it out so far at least. Thanks in advance for help.

[JiaweiZhuang]

Oops, xESMF has some issue with periodic boundary conditions right now. Sorry for the trouble.

There are two quick ways to fix that:

• Use conservative regridding. It uses cell corner information and won't miss any cells.
• Manually extend one more grid point in the longitude direction. For example, let lon = [-180, -175..., 175, 180] and use the same data at -180 and 180

[spencerahill]

Thanks. I will try one or both of these and let you know how it goes.

[JiaweiZhuang]

Periodic boundary option is now included in v0.1.1. Just set
regridder = xe.Regridder(..., periodic=True)

The option is used in this demo.