Refactor xarray grid deltas calculation to handle axis order flexibly #1260
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dopplershift
added
Area: Xarray
This was referenced Jan 10, 2020
dopplershift
previously approved these changes
Jan 13, 2020
src/metpy/calc/tools.py
Outdated
| @@ -787,35 +800,48 @@ def lat_lon_grid_deltas(longitude, latitude, **kwargs): | |||
| longitude = np.asarray(longitude) | |||
| latitude = np.asarray(latitude) | |||
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| # Determine dimension order for offset slicing | |||
| take_y = make_take(latitude.ndim, kwargs.pop('y_dim', -2)) | |||
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Think this and x_dim could become a kwarg-only argument?
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Sure. Looking back at this, I'm not sure why I did it the way it is now.
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Description Of Changes
As noted in #1249 (comment), the grid deltas calculation does not handle dimension/axis order that are not (..., y, x), whereas a goal of MetPy's xarray integration is to be able to flexibly handle dimension order. This PR refactors
lat_lon_grid_deltasandgrid_deltas_from_dataarrayto now flexibly handle dimension order. There were also some accompanying changes:find_axis_numberhelper (similar tofind_axis_name) has been added to the DataArray accessorkindargument togrid_deltas_from_dataarray, which has options "actual" and "nominal" to pave the way for Generalize vorticity (and related functions) to allow for map projections #893bump minimum xarray version to 0.13.0, which is needed for Pint Quantities to be inside xarray objects(doesn't quite work with Pint v0.9)axis/axesargument documentation to fully resolve Documentation for axes in gradient calc #1249Checklist