Iris integration

[stephenworsley]

Overview

Write functions and and objects which operate on Iris cubes in order to accomplish use cases as described here: https://www.overleaf.com/project/62b236bcf6c9c19ac9efd441

Details

The Iris objects to operate on are "LFRIC style" defined on the edges of UGRID meshes, or "UM style" defined on Arakawa grids.

The operations to do with these objects are regridding from one object onto the grid/mesh of another and calculating the path integral given a field described on one of these objects and a description of a path. In the case of regridding, this solution can be given the form of an Iris regridding scheme like iris.analysis.Linear which can be called with the signature result = src_cube.regrid(tgt_cube, Scheme()) or regridder = Scheme().regridder(src_cube, tgt_cube); result = regridder(src_cube).

Task Breakdown

• Write translation from iris mesh object to equivalent MINT object.
• Write translation from iris (Arakawa) grid object to equivalent MINT object.
• Write skeleton for regridder scheme (consider the rough structure described here (Regridder unification) improve curvilinear regridding, generalise _create_cube SciTools/iris#4807 (comment)).
• "Flesh out" skeleton regridder scheme.
• Write path integral function.