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  3. Interactive Maps with leaflet in R

Exercise

Change up the Base

Similar to how we added overlay groups (i.e., college sectors), we can allow our users to toggle between different base maps using the baseGroups argument to the addLayersControl() function.

First we will need to add multiple basemaps and specify the name of a group for each. 

leaflet() %>% 
  addTiles(group = "OSM") %>% 
  addProviderTiles("CartoDB", group = "CartoDB")

Try running the above code in the console. You should see a leaflet map in the viewer with the CartoDB basemap. This is because we added the CartoDB base map after the default OpenStreetMap tile. If we add addLayerControl(), our users will be able to toggle between the two base maps (you can include many base maps, but only one can be selected at a time).

Instructions

100 XP
  • Add the OSM, CartoDB and Esri tiles.
  • Use the addLayersControl() function to allow users to toggle between the three base maps.