Mapping All Colleges

Let's keep layering up and add for-profit colleges to our leaflet map that is stored in the m3 object.

After you print() the m3 map with public, private, and for-profit colleges as their own layers, then try removing all three layers and adding them back to the map in a different order.

The different college sectors are added back to the map as layers in the order you specify (i.e., the last sector that you select will be on top).

The color palette pal and the m3 map with public and private colleges have been loaded for you.

This exercise is part of the course

Interactive Maps with leaflet in R

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Exercise instructions

Filter the ipeds data to create a data frame with only for-profit colleges and assign it to profit.
Create a leaflet map of public, private, and for-profit colleges.
Use the addLayersControl() function and overlayGroups argument to allow users to toggle all three sectors of colleges.
Center the map on the middle of the US and set the zoom level to 4.

Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

# Create data frame called profit with only For-Profit colleges
___ <- filter(ipeds, sector_label == "For-Profit")  

# Add For-Profit colleges to `m3` as a new layer
m3 <- m3 %>% 
        addCircleMarkers(data = ___, radius = 2, label = ~htmlEscape(name),
                         color = ~pal(sector_label),   group = "___")  %>% 
        addLayersControl(overlayGroups = c("Public", "Private", "___"))  

# Center the map on the middle of the US with a zoom of 4
m4 <- m3 %>%
        ___(lat = 39.8282, lng = -98.5795, zoom = 4) 
        
m4

Edit and Run Code

Interactive Maps with leaflet in R

BeginnerSkill Level

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Chapter 1 will introduce students to the htmlwidgets package and the leaflet package. Following this introduction, students will build their first interactive web map using leaflet. Through the process of creating this first map students will be introduced to many of the core features of the leaflet package, including adding different map tiles, setting the center point and zoom level, plotting single points based on latitude and longitude coordinates, and storing leaflet maps as objects. Chapter 1 will conclude with students geocoding DataCamp’s headquarters, and creating a leaflet map that plots the headquarters and displays a popup describing the location.

Exercise 1: Introduction to leaflet Exercise 2: Loading the leaflet Library Exercise 3: Creating an Interactive Web Map Exercise 4: Map Tiles Exercise 5: Provider Tiles Exercise 6: Adding a Custom Map Tile Exercise 7: Setting the Default Map View Exercise 8: A Map with a View I Exercise 9: A Map with a Narrower View Exercise 10: Plotting DataCamp HQ Exercise 11: Mark it Exercise 12: Adding Popups and Storing your Map

In Chapter 4 students will learn to map polygons, which can be used to define geographic regions (e.g., zip codes, states, countries, etc.). Chapter 4 will start by plotting the zip codes in North Carolina that fall in the top quartile of mean family incomes. Students will learn to customize the polygons with color palettes and labels. Chapter 4 will conclude with adding a new layer to the map of every college in America that displays every zip code with a mean income of $200,000 or more during the 2015 tax year. Through the process of mapping zip codes students will learn about spatial data generally, geoJSON data, the @ symbol, and the addPolygons() function. Furthermore, students will have an opportunity to practice applying many of the options that they learned about in the previous chapters, such as popups and labels, as well as new ways to customize their maps, such as the highlight option in addPolygons().

Exercise 1: Spatial Data Exercise 2: Introduction to Spatial Data Exercise 3: Exploring Spatial Data Exercise 4: Joining Spatial Data Exercise 5: Mapping Polygons Exercise 6: addPolygons() Function Exercise 7: NC High Income Zips Exercise 8: addPolygon() Options Exercise 9: Let's do some Logging Exercise 10: Putting it All Together Exercise 11: Wealthiest Zip Codes in America Exercise 12: Final Map Exercise 13: Thank you!