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  3. Interactive Maps with leaflet in R

Exercise

Making our Map Pop

Similar to building a plot with ggplot2 or manipulating data with dplyr, your map needs to be stored in an object if you reference it later in your code.

Speaking of dplyr, the %>% operator can pipe data into the function chain that creates a leaflet map. 

ipeds %>% 
    leaflet()  %>% 
        addTiles() %>% 
        addCircleMarkers(popup = ~name, color = "#FF0000")


Piping makes our code more readable and allows us to refer to variables using the ~ operator rather than repeatedly specifying the data frame.

The color argument in addCircleMarkers() takes the name of a color or a hex code. For example, red or #FF0000.

map has been printed for you. Notice the circle markers are gone!

Instructions 1/3

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  • Add circle markers with popups for college names.