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Exercise

Mark it

So far we have been creating maps with a single layer: a base map. We can add layers to this base map similar to how you add layers to a plot in ggplot2. One of the most common layers to add to a leaflet map is location markers, which you can add by piping the result of addTiles() or addProviderTiles() into the add markers function.

For example, if we plot DataCamp's NYC HQ by passing the coordinates to addMarkers() as numeric vectors with one element, our web map will place a blue drop pin at the coordinate. In chapters 2 and 3, we will review some options for customizing these markers. 

leaflet()  %>% 
    addProviderTiles("CartoDB")  %>% 
    addMarkers(lng = -73.98575, lat = 40.74856)

The dc_hq tibble is available in your work space.

Instructions 1/3
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Plot DataCamp's NYC HQ using addMarkers().

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