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  • Projection issue with plot.imshow and cartopy projection · 4 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
470715951 https://github.com/pydata/xarray/issues/1581#issuecomment-470715951 https://api.github.com/repos/pydata/xarray/issues/1581 MDEyOklzc3VlQ29tbWVudDQ3MDcxNTk1MQ== dcherian 2448579 2019-03-07T22:09:41Z 2019-03-07T22:09:41Z MEMBER

maybe it would be useful to specify somewhere that imshow will work only for regularly spaced data indeed.

Current docstring for imshow does specify this. Closing.

 
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   Projection issue with plot.imshow and cartopy projection 258913450
330674260 https://github.com/pydata/xarray/issues/1581#issuecomment-330674260 https://api.github.com/repos/pydata/xarray/issues/1581 MDEyOklzc3VlQ29tbWVudDMzMDY3NDI2MA== jbusecke 14314623 2017-09-19T21:09:11Z 2017-09-19T21:09:11Z CONTRIBUTOR

Thank you very much @fmaussion. And that is indeed interesting. I have just started to work with this, so I appreciate the pointer! 

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   Projection issue with plot.imshow and cartopy projection 258913450
330673880 https://github.com/pydata/xarray/issues/1581#issuecomment-330673880 https://api.github.com/repos/pydata/xarray/issues/1581 MDEyOklzc3VlQ29tbWVudDMzMDY3Mzg4MA== fmaussion 10050469 2017-09-19T21:07:32Z 2017-09-19T21:07:32Z MEMBER

Regarding your comment about the doc: maybe it would be useful to specify somewhere that imshow will work only for regularly spaced data indeed.

 
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   Projection issue with plot.imshow and cartopy projection 258913450
330673189 https://github.com/pydata/xarray/issues/1581#issuecomment-330673189 https://api.github.com/repos/pydata/xarray/issues/1581 MDEyOklzc3VlQ29tbWVudDMzMDY3MzE4OQ== fmaussion 10050469 2017-09-19T21:04:42Z 2017-09-19T21:04:42Z MEMBER

Thanks for the detailed and well documented question. I had a look at your data, and there are two issues that imshow cannot handle well: - your data isn't well centred (lons go from -300 to 60, which explains the shape of your image on the globe). This wouldn't be a big deal if it wasn't for the other problem, which is: - your latitude data isn't regular.

python plt.plot(ds.lath[1:].values - ds.lath[:-1].values) Gives:

which is quite... interesting.

Anyways, imshow is so much faster because it needs regular, nicely sorted data. In your case I don't think there is much other choice than pcolormesh or contourf... Note also that plotting on Robinson is slower than plotting on a plate carree projection.

 
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   Projection issue with plot.imshow and cartopy projection 258913450

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