Regrid from icosahedral (triangular) grid to rectangular

[albertotb]

Is this package able to regrid from a triangular grid to a rectangular one? As an use case the data from this model
https://www.dwd.de/EN/ourservices/nwp_forecast_data/nwp_forecast_data.html is distributed as a triangular grid. They provide instructions to transform it into a rectangular grid using CDO (https://www.dwd.de/DE/leistungen/opendata/help/modelle/Opendata_cdo_EN.pdf?__blob=publicationFile&v=3), but I was curious if this package could provide an alternative.

[huard]

xESMF supports unstructured grids, so I suspect it should indeed be possible.

See https://xesmf.readthedocs.io/en/latest/notebooks/Using_LocStream.html

[albertotb]

Thanks, I will take a look!. If you are looking for examples for the documentation the data for that particular model is distributed openly. In any case feel free to close the issue whenever.

[aulemahal]

@huard I don't think a LocStream is an unstructrued grid, it rather is a list of points, i.e. there is no relation between each point.
ESMF supports this with its MeshGrid, but the implementation is not yet available though xESMF because there is no standard / data structure in the xarray world that supports those. Or at least, not that we were aware of when we last looked.

ESMpy however, is capable of doing it. @albertotb I would suggest you take a look there :https://earthsystemmodeling.org/esmpy_doc/release/latest/html/index.html
It will be quite more complicated than with all the xESMF goodies, but at least you'll stay in python...

[huard]

You're right, sorry about the misdirection.