Drawing contours
================


.. plot::
    :include-source:

    import matplotlib.pyplot as plt
    import cartopy.crs as ccrs
    from cartopy.examples.waves import sample_data

    ax = plt.axes(projection=ccrs.Robinson())

    ax.set_global()

    lons, lats, data = sample_data(shape=(20, 40))

    plt.contourf(lons, lats, data, transform=ccrs.Geodetic())

    ax.coastlines()
    ax.gridlines()

    plt.show()