iris.experimental.ugrid.utils#

Utility operations specific to unstructured data.

iris.experimental.ugrid.utils.recombine_submeshes(mesh_cube, submesh_cubes, index_coord_name='i_mesh_index')[source]#

Put data from sub-meshes back onto the original full mesh.

The result is a cube like mesh_cube, but with its data replaced by a combination of the data in the submesh_cubes.

Parameters:

mesh_cube (Cube) – Describes the mesh and mesh-location onto which the all the submesh-cubes’ data are mapped, and acts as a template for the result. Must have a Mesh.
submesh_cubes (iterable of Cube, or Cube) – Cubes, each with data on a _subset_ of the mesh_cube datapoints (within the mesh dimension). The submesh cubes do not need to have a mesh. There must be at least 1 of them, to determine the result phenomenon. Their metadata (names, units and attributes) must all be the same, _except_ that ‘var_name’ is ignored. Their dtypes must all be the same. Their shapes and dimension-coords must all match those of mesh_cube, except in the mesh dimension, which can have different sizes between the submeshes, and from the mesh_cube. The mesh dimension of each must have a 1-D coord named by index_coord_name. These “index coords” can vary in length, but they must all have matching metadata (units, attributes and names except ‘var_name’), and must also match the coord of that name in mesh_cube, if there is one. The “.points” values of the index coords specify, for each datapoint, its location in the original mesh – i.e. they are indices into the relevant mesh-location dimension.
index_coord_name (Cube) – Coord name of an index coord containing the mesh location indices, in every submesh cube.

Returns:

A cube with the same mesh, location, and shape as mesh_cube, but with its data replaced by that from the``submesh_cubes``. The result phenomeon identity is also that of the``submesh_cubes``, i.e. units, attributes and names (except ‘var_name’, which is None).

Return type:

result_cube

Notes

Where regions overlap, the result data comes from the submesh cube containing that location which appears _last_ in submesh_cubes.

Where no region contains a datapoint, it will be masked in the result. HINT: alternatively, values covered by no region can be set to the original ‘full_mesh_cube’ data value, if ‘full_mesh_cube’ is also passed as the first of the ‘region_cubes’.

The result_cube dtype is that of the submesh_cubes.