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  • plot.pcolormesh fails with shading='gouraud' · 5 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
735419937 https://github.com/pydata/xarray/issues/3002#issuecomment-735419937 https://api.github.com/repos/pydata/xarray/issues/3002 MDEyOklzc3VlQ29tbWVudDczNTQxOTkzNw== johnomotani 3958036 2020-11-29T16:28:32Z 2020-11-29T16:28:32Z CONTRIBUTOR

I had the same problem. I found that da.plot.pcolormesh('lon', 'lat', shading='gouraud', infer_intervals=False) does work. Would be nice if shading='gouraud' worked by default though.

I guess the problem is that 'gouraud' needs the coordinate positions at the grid points, and I assume infer_intervals=True is creating coordinate values at the grid-cell corners (so an n x m DataArray is plotted using coordinates with lengh (n+1) and (m+1). I haven't looked into what infer_intervals actually does though. Would it be safe to just turn it off if shading='gouraud' is used?

 
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   plot.pcolormesh fails with shading='gouraud' 453126577
499800529 https://github.com/pydata/xarray/issues/3002#issuecomment-499800529 https://api.github.com/repos/pydata/xarray/issues/3002 MDEyOklzc3VlQ29tbWVudDQ5OTgwMDUyOQ== TomNicholas 35968931 2019-06-07T08:22:02Z 2019-06-07T08:22:02Z MEMBER

I tried python da.plot.pcolormesh('lon', 'lat', shading='gouraud', infer_intervals=True) but got the same error unfortunately.

 
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   plot.pcolormesh fails with shading='gouraud' 453126577
499694802 https://github.com/pydata/xarray/issues/3002#issuecomment-499694802 https://api.github.com/repos/pydata/xarray/issues/3002 MDEyOklzc3VlQ29tbWVudDQ5OTY5NDgwMg== dcherian 2448579 2019-06-06T22:43:24Z 2019-06-06T22:43:24Z MEMBER

This might be an infer_interval_breaks issue?

 
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   plot.pcolormesh fails with shading='gouraud' 453126577
499690759 https://github.com/pydata/xarray/issues/3002#issuecomment-499690759 https://api.github.com/repos/pydata/xarray/issues/3002 MDEyOklzc3VlQ29tbWVudDQ5OTY5MDc1OQ== TomNicholas 35968931 2019-06-06T22:26:35Z 2019-06-06T22:26:35Z MEMBER

Oh thanks @dcherian !

That's confusing because this works:

python plt.pcolormesh(da['lon'].values, da['lat'].values, da.values, shading='gouraud')

but it looks like matplotlib is the problem, I'll close this.

 
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   plot.pcolormesh fails with shading='gouraud' 453126577
499586759 https://github.com/pydata/xarray/issues/3002#issuecomment-499586759 https://api.github.com/repos/pydata/xarray/issues/3002 MDEyOklzc3VlQ29tbWVudDQ5OTU4Njc1OQ== dcherian 2448579 2019-06-06T17:16:07Z 2019-06-06T17:16:07Z MEMBER 
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   plot.pcolormesh fails with shading='gouraud' 453126577

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