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Interpolation from unstructured grids to observation points.


I am trying to interpolate from the unstructured grids of MPAS to the observation points. However, I found that it is difficult to determine the closest cell to the observation point due to the form of mpas grid storage. I would like to wonder if there is a good way to determine this?
I would recommend using ESMF to interpolate between MPAS and other grids. It's especially convenient for repeated interpolations.