html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
https://github.com/pydata/xarray/issues/781#issuecomment-256894432,https://api.github.com/repos/pydata/xarray/issues/781,256894432,MDEyOklzc3VlQ29tbWVudDI1Njg5NDQzMg==,10050469,2016-10-28T11:06:35Z,2016-10-28T11:06:35Z,MEMBER,"Yes, this is definitely a problem.

See for example the differences between `imshow` (which does fine) and `pcolormesh` (which is clearly wrong)

``` python
import numpy as np
import matplotlib.pyplot as plt
import cartopy.crs as ccrs
import xarray as xr

da = xr.DataArray(np.arange(20).reshape(4, 5), dims=['lat', 'lon'],
                  coords = {'lat': np.linspace(0, 30, 4),
                            'lon': np.linspace(-20, 20, 5)})

f = plt.figure()
ax = plt.axes(projection=ccrs.PlateCarree())
da.plot.pcolormesh(ax=ax, transform=ccrs.PlateCarree())
lon, lat = np.meshgrid(da.lon.values, da.lat.values)
ax.scatter(lon, lat, transform=ccrs.PlateCarree())
ax.coastlines()
ax.set_title('pcolormesh')

f = plt.figure()
ax = plt.axes(projection=ccrs.PlateCarree())
da.plot.imshow(ax=ax, transform=ccrs.PlateCarree())
ax.scatter(lon, lat, transform=ccrs.PlateCarree())
ax.coastlines()
ax.set_title('imshow')

plt.show()
```

![pcolormesh](https://cloud.githubusercontent.com/assets/10050469/19804539/378bc81c-9d0f-11e6-8833-2813153f5f49.png)

![imshow](https://cloud.githubusercontent.com/assets/10050469/19804548/415c2db4-9d0f-11e6-8834-50b270ba0c57.png)
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