Assignment: Introduction to mapping in R

Using data from the geo directory in the data folder, please answer the following question. Use comments to respond as necessary.

Questions

1. Re-project and re-plot your lower 48 states map df_l48 using a CRS code of 3338 (good for Alaska) and 32136 (good for Tennessee). What happens to the map each time?
2. Choose a different cut point for BA attainment and different years. Plot another small multiples plots showing changes over time.
3. Rerun this bit of code,

   df_sch_zip %>%
      st_drop_geometry() %>%
     	  group_by(zip) %>%
      summarise(num_schools = n()) %>%
      arrange(desc(num_schools))
   

   but store the results in a tibble this time. Join the tibble back to the df_zip sf object and make a plot that color codes each zip code by the number of schools it contains.

4. Using the Alchua County geo data, flip the order of df_zon and df_zip in st_intersection() in order to see how many school zones are in each zip code. Choose a zip code that covers more than one elementary zone and plot it, color coding the unique elementary school zones.

Submission details

• Save your script (<lastname>_assignment_mapping.R) in your scripts directory.
• Push changes to your repo (the new script and new folder) to GitHub prior to the next class session.