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  • imshow RGB plot overlaps map borders when using projection · 3 ✖

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575598339 https://github.com/pydata/xarray/issues/3687#issuecomment-575598339 https://api.github.com/repos/pydata/xarray/issues/3687 MDEyOklzc3VlQ29tbWVudDU3NTU5ODMzOQ== mathause 10194086 2020-01-17T11:58:33Z 2020-01-17T11:58:33Z MEMBER

This happens in matplotlib when you pass an RGBA array. Thus the following should cause the same problem.

python ax = plt.subplot(projection=ccrs.Robinson()) ax.imshow(ds.isel(time=[0, 1, 4, 8]).transpose('lat', 'lon', 'time').values[-1::-1, :, :], transform=ccrs.PlateCarree())

I.e. it is an matplotlib or cartopy error. However, xarray always adds an alpha channel internally, see

https://github.com/pydata/xarray/blob/8a650a11d1f859a88cc91b8815c16597203892aa/xarray/plot/plot.py#L901-L903

 
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   imshow RGB plot overlaps map borders when using projection 548483156
573806802 https://github.com/pydata/xarray/issues/3687#issuecomment-573806802 https://api.github.com/repos/pydata/xarray/issues/3687 MDEyOklzc3VlQ29tbWVudDU3MzgwNjgwMg== dcherian 2448579 2020-01-13T18:35:14Z 2020-01-13T18:35:14Z MEMBER

Thanks, I'm marking this as a bug.

If you have the time, it would be nice if you could look into this and send in a PR.

We do some RGB stuff here: https://github.com/pydata/xarray/blob/8a650a11d1f859a88cc91b8815c16597203892aa/xarray/plot/plot.py#L632-L642

and imshow is here: https://github.com/pydata/xarray/blob/8a650a11d1f859a88cc91b8815c16597203892aa/xarray/plot/plot.py#L843-L915

 
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   imshow RGB plot overlaps map borders when using projection 548483156
573784386 https://github.com/pydata/xarray/issues/3687#issuecomment-573784386 https://api.github.com/repos/pydata/xarray/issues/3687 MDEyOklzc3VlQ29tbWVudDU3Mzc4NDM4Ng== dcherian 2448579 2020-01-13T17:44:35Z 2020-01-13T17:44:35Z MEMBER

Does this work if you use matplotlib directly? i.e. plt.plot(ds.isel(time=[0, 4, 8]).values, ...)

 
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   imshow RGB plot overlaps map borders when using projection 548483156

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