Esmf-regrid

Added

- [PR178](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/178)
Added support for coordinate systems with non-degree type units.
[stephenworsley](https://github.com/stephenworsley)

- [PR311](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/311)
Added support for Mesh to Mesh regridding.
[HGWright](https://github.com/HGWright)

Fixed

- [PR301](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/301)
Fixed a bug which caused errors when regridding with the node locations
of a mesh whose face_node_connectivity had non-zero start_index.
[stephenworsley](https://github.com/stephenworsley)

Added

- [PR289](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/289)
Added the ability to regrid onto a Mesh as a target instead of a Cube.
[stephenworsley](https://github.com/stephenworsley)

Added

- [PR198](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/198)
As a result of refactoring regridders to all derive from the same class,
`_ESMFRegridder`, functionality has been added to the `ESMFAreaWeighted`
scheme and a new scheme, `ESMFBilinear`, has been added.
These schemes are now able to handle both grids and meshes.
Additionally, they are also able to specify the resolution of cells in
these grids with the `src_resolution` and `tgt_resolution` keywords.
[stephenworsley](https://github.com/stephenworsley) with extensive review
work from [trexfeathers](https://github.com/trexfeathers)
- [PR266](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/266)
Added Nearest neighbour regridding.
[stephenworsley](https://github.com/stephenworsley)
[HGWright](https://github.com/HGWright)
- [PR272](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/272)
Add support for Python 3.11.
[stephenworsley](https://github.com/stephenworsley)

Changed

- [PR198](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/198)
Refactor regridders to all derive from the same class `_ESMFRegridder`.
For the sake of consistency, the resolution keyword in
`GridToMeshESMFRegridder` and `MeshToGridESMFRegridder` have been
replaced by `src_resolution` and `tgt_resolution` respectively.
[stephenworsley](https://github.com/stephenworsley) with extensive review
work from [trexfeathers](https://github.com/trexfeathers)

Removed

- [PR272](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/272)
Remove support for Python 3.8.
[stephenworsley](https://github.com/stephenworsley)

Fixed

- [PR258](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/258)
Allow the documentation to build properly.
[zklaus](https://github.com/zklaus)

Added

- [PR217](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/217)
Changed the behaviour of coordinate fetching to allow Cubes with both
1D DimCoords and 2D AuxCoords. In this case the DimCoords are prioritised.
[stephenworsley](https://github.com/stephenworsley)
- [PR220](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/220)
Matured the benchmarking architecture in line with the latest setup in
SciTools/iris.
[trexfeathers](https://github.com/trexfeathers)
- [PR241](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/241)
Fixed compatibility with esmpy 8.4.
[stephenworsley](https://github.com/stephenworsley) with help from
[bjlittle](https://github.com/bjlittle) and
[valeriupredoi](https://github.com/valeriupredoi)
- [PR219](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/219)
Added support for 2D AuxCoords with discontiguities under masked values
with the use_src_mask and use_tgt_mask keywords.
[stephenworsley](https://github.com/stephenworsley)with extensive review
work from [trexfeathers](https://github.com/trexfeathers)

Fixed
- [PR242](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/242)
Fixed an issue which caused regridding to curvilinear grids with lazy
data to fail.
[stephenworsley](https://github.com/stephenworsley)

This release improves the support for features such as Bilinear regridding,
curvilinear grids and low resolution grids.

Added

- [PR148](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/148)
Added support for Bilinear regridding for unstructured regridding.
- [PR165](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/165)
Added RefinedGridInfo and resolution keyword for unstructured regridders.
- [PR166](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/166)
Made weights array handling more robust for different formats of
pre-computed weights matrices.
- [PR175](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/175)
Add curvilinear support for unstructured regridders.
- [PR208](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/208)
Unpin Python.

This release added the ability to regrid data stored on a UGRID mesh.

Added

- [PR31](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/31)
[PR32](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/32)
[PR36](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/36)
[PR39](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/39)
[PR46](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/46)
[PR55](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/55)
[PR96](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/96)
Added the unstructured regridders `GridToMeshESMFRegridder` and
`MeshToGridESMFRegridder`.
[stephenworsley](https://github.com/stephenworsley) with extensive review
work from [abooton](https://github.com/abooton) and
[jamesp](https://github.com/jamesp) with benchmarking help from
[trexfeathers](https://github.com/trexfeathers)
- [PR130](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/130)
[PR137](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/137)
Added functions for saving of the unstructured regridders.
[stephenworsley](https://github.com/stephenworsley)
- [PR155](https://github.com/SciTools-incubator/iris-esmf-regrid/pull/155)
Enabled Sphinx and RTD for automatically rendering the API.
[trexfeathers](https://github.com/trexfeathers)