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  • mathause · 2 ✖

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  • Working with Multidimensional Coordinates - Plotting PlateCarree projection looks strange · 2 ✖

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750402407 https://github.com/pydata/xarray/issues/4596#issuecomment-750402407 https://api.github.com/repos/pydata/xarray/issues/4596 MDEyOklzc3VlQ29tbWVudDc1MDQwMjQwNw== mathause 10194086 2020-12-23T17:37:07Z 2020-12-23T17:37:07Z MEMBER

I could not find anything about mpl removing flat shading, are you sure about that?

It's in the deprecation warning: MatplotlibDeprecationWarning: shading='flat' when X and Y have the same dimensions as C is deprecated since 3.3. Either specify the corners of the quadrilaterals with X and Y, or pass shading='auto', 'nearest' or 'gouraud', or set rcParams['pcolor.shading']. This will become an error two minor releases later.

I believe the best (albeit tedious) solution is to resample the coordinates from nxny to (nx+1)(ny+1)

We are currently doing this (if the coordinates are monotonic). And mpl also started doing it (and now gives a warning on non-monotonic coordinates). The problem is that with non-monotonic coordinates it leads to wrong results.

If only needs to be ensured that none of the 'new' quadliterals crosses the map boundary.

I think that's not trivial - see also: SciTools/cartopy#1638 and matplotlib/matplotlib#18317 and has to be fixed upstream. There is a proposed fix, see: SciTools/cartopy#1646.

 
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   Working with Multidimensional Coordinates - Plotting PlateCarree projection looks strange 746929580
730698059 https://github.com/pydata/xarray/issues/4596#issuecomment-730698059 https://api.github.com/repos/pydata/xarray/issues/4596 MDEyOklzc3VlQ29tbWVudDczMDY5ODA1OQ== mathause 10194086 2020-11-19T23:18:23Z 2020-11-19T23:18:23Z MEMBER

Yes, this is due to an upstream change in matplotlib - see also #4364. mpl tries to infer the edges of the gridcell - which does not work if the data is not monotonic. In the short term we can fix this by passing shading="flat":

python ds.Tair[0].plot.pcolormesh(ax=ax, transform=ccrs.PlateCarree(), x='xc', y='yc', add_colorbar=False)

however, mpl will eventually remove shading="flat". I am not sure what the best way forward is. mpl recommends to drop a row and column of the data (which it did earlier automatically). See:

https://github.com/SciTools/cartopy/issues/1638#issuecomment-692741908

 
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   Working with Multidimensional Coordinates - Plotting PlateCarree projection looks strange 746929580

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