map_data: Get Map
In devOpifex/g2r: Interactive Grammar of Graphics

Retrieve map data to pass to the maps argument of the fig_map() function.

get_gadm_data(iso3c, level = c(0, 1, 2, 3, 4), keep = 0.05)

get_map_data(region = ".", level = c("region", "subregion"), name = "world")

get_world_map()

`iso3c`	Iso3c code of the country to retrieve, e.g.: `USA`.
`level`	Level of the polygons to draw, either the region or subregion.
`keep`	Proportion of points to retain, it is highly recommended to reduce the detail of the map or it will take too long to load in the browser. Set to `NULL` to not reduce the amount of details.
`region`	Character vector that names the polygons to draw.
`name`	Name of the database to use.

get_gadm_data: Retrieves country-level data from gadm.org.
get_map_data: Uses the maps::map() function to retrieve the map data, similar to ggplot2::map_data.
get_world_map: Retrives a world map (from GeoJSON).