Add a Natural Earth background

An alternative to Google Static Maps

Out:

/home/docs/checkouts/readthedocs.org/user_builds/salem/conda/v0.3.6/lib/python3.8/site-packages/descartes/patch.py:62: ShapelyDeprecationWarning: The array interface is deprecated and will no longer work in Shapely 2.0. Convert the '.coords' to a numpy array instead.
  vertices = concatenate([
/home/docs/checkouts/readthedocs.org/user_builds/salem/conda/v0.3.6/lib/python3.8/site-packages/descartes/patch.py:64: ShapelyDeprecationWarning: The array interface is deprecated and will no longer work in Shapely 2.0. Convert the '.coords' to a numpy array instead.
  [asarray(r)[:, :2] for r in t.interiors])

import salem
import matplotlib.pyplot as plt

# get the map from a predefined grid
grid = salem.mercator_grid(transverse=False, center_ll=(16., 0.),
                           extent=(8e6, 9e6))
smap = salem.Map(grid)

# Add the background (other resolutions include: 'mr', 'hr')
smap.set_rgb(natural_earth='lr')

# done!
smap.visualize()
plt.show()