Having a custom engine for open_mfdatatree #55
Description
Hi @TomNicholas !
I am one of the core devs of satpy (https://github.com/pytroll/satpy), which makes use of xarray/dask to handle satellite data for earth-observing satellites.
In this context, we have many times satellite data which have different resolutions for a same dataset, hence xarray's dataset can't really be used for these data, as the coords for the different variables don't match, and DataTree makes a lot of sense for us.
The satellite data, more often than not, is in some binary format, and we read it and convert it to xarray.DataArrays, and I'm now started experimenting placing them in a DataTree by hand.
So it would be really nice if there was an interface for adding custom engines to read that data (multiple files). Did you already consider that? Do you maybe already have an idea on how this would work?
We have been wanting to stick closer to the data model of xarray in our library, and datatree looks like something we could really use :) let's hope we can contribute here, at least with ideas in the future.
