Improve xarray support about wrf-python HOT 9 OPEN

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It would be nice to have this as an extension to xarray. That way you could call something like

with xr.open_dataset('/path/to/file.nc') as xd:
    t = xd.wrf.getvar('temp')
    proj4 = xd.wrf.proj4
    cart_proj = xd.wrf.cartopy

See: http://xarray.pydata.org/en/stable/internals.html#extending-xarray

I have used it here:
https://github.com/snowman2/pangaea/blob/master/pangaea/xlsm.py

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Looks like it would not be bad to try to merge with salem. See: fmaussion/salem#82

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Any news about an improved xarray support ?
It would be nice at first to be able to get data from xarray datasets, like

with xr.open_dataset('/path/to/file.nc') as ds:
    t = wrf.getvar(ds, 'temp')

from wrf-python.

I'm also wondering about this one. It's not straightforward to use getvar on a large number of WRF output files (see issue 94); seems xarray could help with this.

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@Timothy-W-Hilton Thanks for bumping this!

I'd be interested in hearing about the wrf-python maintainers' perspective on this as well. I've been working a fair bit with WRF output in xarray (especially in the context of MetPy and CF conventions, see this abstract), and would be glad to collaborate on these efforts going forward if it seems to be a good fit.

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We, the GeoCAT team at NCAR, do have plans to refactor wrf-python to be compatible with Xarray. However, the team's priority at the moment is rolling out model-agnostic computational routines (called GeoCAT.comp). These new functions operate directly on Xarray data arrays. The repo for these new functions is here: https://github.com/NCAR/geocat-comp

We don't yet have a timeframe for turning our focus back to wrf-python. However, if this is something that someone in the community wanted to bite off we'd be happy to provide guidance.

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@clyne Thank you for the update! After the hecticness of the AMS Meeting and a few pending projects settle down, I'll see if (and in what ways) I could be of any help with this.

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Thanks, @clyne, for the update! It's nice to know that the slowdown in wrf-python development these past six months doesn't indicate it's being phased out. I'm also open to helping out, though 2020 doesn't really have a lot of space for a large new project for me.

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