Now, I'm ready to plot the map for the Arctic, with land and ocean in different colors.
However, when I add_feature to the land and ocean, the color of ocean will overlap the land (or the continents near the Arctic). That is, the cartopy may be treat the ocean inaccurately in the Arctic.

The code for this map is shown as follows:

import matplotlib.pyplot as plt
import cartopy.crs as ccrs
import cartopy.feature as cfeature
fig = plt.figure(figsize=[5,5])
ax1 = fig.add_subplot(1, 1, 1, projection=ccrs.NorthPolarStereo(central_longitude=0))
ax1.set_extent([-180, 180,60, 90], ccrs.PlateCarree())
ax1.gridlines()
ax1.add_feature(cfeature.LAND)
ax1.add_feature(cfeature.OCEAN)
plt.show()

However, if I exchange the order for the two sentences, write the "ax1.add_feature(cfeature.OCEAN)" first and then write "ax1.add_feature(cfeature.LAND)", it seems works.

Code to reproduce

Traceback