title: Cartopy problem when plotting NetCDF file
body: <p>I'm trying to display some data with cartopy. I read the NetCDF file with xarray and tried to plot it with the non-rotated coordinates available:</p>
  <pre><code>import xarray as xr
  import matplotlib.pyplot as plt
  import cartopy.crs as ccrs
  
  dset = xr.open_dataset(&quot;tas_EUR-11_IPSL-IPSL-CM5A-MR_rcp85_r1i1p1_GERICS-REMO2015_v1_mon_201101-202012.nc&quot;)
  tas = dset['tas']
  
  fig = plt.figure(figsize=[12,5])
  
  ax = fig.add_subplot(111, projection=ccrs.PlateCarree())
  
  dset.isel(time=0)['tas'].plot(ax=ax, transform=ccrs.PlateCarree(), x='lon', y='lat', 
  add_colorbar=False)
  
  ax.coastlines()
  ax.set_global()
  plt.show()
  </code></pre>
  <p>The problem is I obtain the following plot:</p>
  <p><a href="https://i.stack.imgur.com/Fodnz.jpg" rel="nofollow noreferrer">picture</a></p>
  <p>Any idea why?</p>