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  • Contourplot not producing plot when data below colorbar level and extend='neither' · 7 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
478171225 https://github.com/pydata/xarray/issues/1578#issuecomment-478171225 https://api.github.com/repos/pydata/xarray/issues/1578 MDEyOklzc3VlQ29tbWVudDQ3ODE3MTIyNQ== georgiospapavasileiou 23721012 2019-03-29T22:44:15Z 2019-03-29T22:44:15Z NONE

I have exactly the same problem with GFS data @karlwx but it seems like a python-related issue! The script was working perfect until last week and now it crashes. 

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   Contourplot not producing plot when data below colorbar level and extend='neither' 258735262
477186599 https://github.com/pydata/xarray/issues/1578#issuecomment-477186599 https://api.github.com/repos/pydata/xarray/issues/1578 MDEyOklzc3VlQ29tbWVudDQ3NzE4NjU5OQ== dcherian 2448579 2019-03-27T14:40:43Z 2019-03-27T14:40:43Z MEMBER

This looks like a matplotlib/cartopy problem since you aren't going through the xarray.plot interface :)

 
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   Contourplot not producing plot when data below colorbar level and extend='neither' 258735262
477158023 https://github.com/pydata/xarray/issues/1578#issuecomment-477158023 https://api.github.com/repos/pydata/xarray/issues/1578 MDEyOklzc3VlQ29tbWVudDQ3NzE1ODAyMw== karlwx 45180714 2019-03-27T13:37:55Z 2019-03-27T13:37:55Z NONE

Also worth mentioning that I had the same issue with pcolormesh, but only when I used the option shading='gouraud'. The map ended up plotting as expected, but still returned the Value Error, so I ignored the error with try and except and continued. Is there really not a fix for any of this yet?

 
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   Contourplot not producing plot when data below colorbar level and extend='neither' 258735262
477155184 https://github.com/pydata/xarray/issues/1578#issuecomment-477155184 https://api.github.com/repos/pydata/xarray/issues/1578 MDEyOklzc3VlQ29tbWVudDQ3NzE1NTE4NA== karlwx 45180714 2019-03-27T13:31:32Z 2019-03-27T13:32:40Z NONE

I experienced the same issue when using contourf. It was fixed by setting extend='both' in the contourf function, and I got rid of the triangles in my colorbar by setting extendfrac=0 in the colorbar function.

The funny thing is, the code worked just fine yesterday, but when I ran it again today, I encountered this problem.

Non-working code: pcp = ax.contourf(x, y, data, cmap=cmap, levels=bounds, transform=proj, norm=norm) cb = plt.colorbar(pcp, cmap=cmap, pad=0.01, shrink=1, norm=norm, ticks=labels, orientation='horizontal')

Working code: pcp = ax.contourf(x, y, data, cmap=cmap, levels=bounds, transform=proj, norm=norm, extend='both') cb = plt.colorbar(pcp, cmap=cmap, pad=0.01, shrink=1, norm=norm, ticks=labels, orientation='horizontal', extendfrac=0)

I'm pulling data from the NCEP NOMADS server, not sure if that matters, but I've found the data download to be slow and pretty questionable at times. 

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   Contourplot not producing plot when data below colorbar level and extend='neither' 258735262
419709424 https://github.com/pydata/xarray/issues/1578#issuecomment-419709424 https://api.github.com/repos/pydata/xarray/issues/1578 MDEyOklzc3VlQ29tbWVudDQxOTcwOTQyNA== dcherian 2448579 2018-09-09T11:29:32Z 2018-09-09T11:29:32Z MEMBER

@Plantain can you provide a reproducible example please?

 
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   Contourplot not producing plot when data below colorbar level and extend='neither' 258735262
419703805 https://github.com/pydata/xarray/issues/1578#issuecomment-419703805 https://api.github.com/repos/pydata/xarray/issues/1578 MDEyOklzc3VlQ29tbWVudDQxOTcwMzgwNQ== Plantain 319895 2018-09-09T09:54:27Z 2018-09-09T09:54:27Z NONE

This happens with extend='max' too.

 
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   Contourplot not producing plot when data below colorbar level and extend='neither' 258735262
330474884 https://github.com/pydata/xarray/issues/1578#issuecomment-330474884 https://api.github.com/repos/pydata/xarray/issues/1578 MDEyOklzc3VlQ29tbWVudDMzMDQ3NDg4NA== fmaussion 10050469 2017-09-19T08:55:50Z 2017-09-19T08:55:50Z MEMBER

Could you provide a minimal example demonstrating the problem, without using cartopy and with dummy data? This will help us to reproduce the problem locally.

 
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   Contourplot not producing plot when data below colorbar level and extend='neither' 258735262

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