About the status of atlas support for regional domains

[TingLei-daprediction]

Dear Atlas experts,
What is the status on the atlas support for regional domains? any more complete and updated doc? While, I am going to dig and learn from examples as atlas used in jedi, That will be very helpful if any explanation/instruction given here.
For example, one of my current questions is a class regularregionalgrid is mentioned in https://sites.ecmwf.int/docs/atlas/design/grid/#regularregionalgrid. But it seems not available in the current atlas version.
Your comments/suggestions on this is appreciated.

[MarekWlasak]

See

atlas/doc/example-grids/regional_lonlat_1.yml

Line 4 in 55e2045

north : -10

Looks like its name may have changed.

[MarekWlasak]

Note that the best way to learn atlas is to look through and understand the ctests.

[TingLei-daprediction]

@MarekWlasak So many thanks! I will follow those regional examples you point to see how it work for regional grids.

[TingLei-daprediction]

Per @benjaminmenetrier permission, his answer relevant to this topic is quoted below:

The ATLAS interpolator is not implemented if the source is a regional StructuredGrid. It crashes in the [MatchingMeshPartitioner](https://github.com/ecmwf/atlas/blob/55e20456d5f754e9d6e1180d8db5fa866010bf3b/src/atlas/grid/detail/partitioner/MatchingMeshPartitionerLonLatPolygon.cc#L56).
I've implemented my own interpolator for regional grids [here](https://git.ecmwf.int/projects/SAB/repos/quench/browse/src/quench/interpolation).
You should use an ATLAS version >= 0.37.0, where https://github.com/ecmwf/atlas/pull/172 is merged.