Use this function instead of plot_ly() to initialize
a plotly-geo object. This enforces the entire plot so use
the scattergeo trace type, and enables higher level geometries
like add_polygons() to work
plot_geo(data = data.frame(), ..., offline = FALSE)A data frame (optional).
arguments passed along to plot_ly().
whether or not to include geo assets so that the map can be viewed with or without an internet connection. The plotlyGeoAssets package is required for this functionality.