Lets-Plot: add Lets-Plot to geo-spatial visualisation

[ASmirnov-HORIS]

The Lets-Plot library is not mentioned in the Geo-Spatial Visualization section. However, it can work with cartographic data. Detailed information about geocoding can be found here.

Basic example with UK districts:

from lets_plot.geo_data import *

country = geocode_counties().scope('UK').inc_res().get_boundaries()

ggplot() + geom_map(data=country, show_legend=False, size=0.2)

Also, you can add an interactive basemap layer to create a beautiful map:

(
    ggplot() 
    + geom_livemap() 
    + geom_map(aes(fill='found name'), data=country, show_legend=False, size=0.2) 
)

[aeturrell]

Fixed in 5a13688