Morton hashing for unstructured grids #2160
Description
As a follow up to #2158 , we're interested in potentially using the morton hashing in place of the UXArray faces_containing_points for searching. This will require some updates to the SpatialHash methods to support the Parcels.UXGrid class.
Given the marked improvement in performance for the curvilinear grid search, we suspect it'd be worth it to see if Morton hashing is more performant for unstructured grids as well.
For reference, under the hood, the UXArray faces_containing_points uses scipy KDTree.