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Mapping with R

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  1. Welcome to Mapping with R (01_01)
  2. Geospatial Data
    Making Maps is Complex (01_02)
  3. mapview for Quick Maps (01_03)
  4. sf for Simple Features (01_04)
  5. Turning Data Frames into sf Objects (01_05)
  6. Importing Shapefiles (01_06)
  7. Joining Geospatial Datasets (01_07)
  8. Disambiguating Country Names (01_08)
  9. Converting Addresses to Coordinates (01_09)
  10. U.S.-Specific Datasets (01_10)
  11. Advice on Finding International Datasets (01_11)
  12. CRS and Projections: Geographic and Projected CRS (01_12)
  13. CRS and Projections: How to Choose a CRS (01_13)
  14. Introducing Raster GIS with raster and stars (01_14)
  15. Basics of Using the raster Package (01_15)
  16. Static Maps
    ggplot2 Essentials (02_01)
  17. Starting a Map in ggplot2 (02_02)
  18. Labelling ggplot2 Maps (02_03)
  19. Compare Locations/Events with Geobubble Charts (02_04)
  20. Highlight a Region in a Country with ggplot2 (02_05)
  21. Make a Choropleth Map of Discrete Variables with ggplot2 (02_06)
  22. Make a Choropleth Map of Continuous Variables with ggplot2 (02_07)
  23. Faceting Choropleth Maps with ggplot2 (02_08)
  24. Visualize Raster Data with ggplot2 (02_09)
  25. Adding Scale Bars and North Arrows with ggplot2 (02_10)
  26. Interactive Maps
    What is leaflet? (03_01)
  27. Starting a Map in leaflet (03_02)
  28. Necessary HTML for Labelling leaflet Maps (03_03)
  29. Highlight a Region in a Country with leaflet (03_04)
  30. Compare Locations/Events with Geobubble Charts in leaflet (03_05)
  31. Make a Choropleth Map of Discrete Variables with leaflet (03_06)
  32. Make a Choropleth Map of Continuous Variables with leaflet (03_07)
  33. Visualize Raster Data with leaflet (03_08)
  34. Wrapping Up
    You Did It!
Lesson 22 of 34
In Progress

Make a Choropleth Map of Continuous Variables with ggplot2 (02_07)

Your Turn

For this exercise I took to Twitter to find a dataset that makes DC distinct from the states of US (in 2020).

Use the your-turn script in 02_07w to make this map, ensuring to add a guide item for District of Columbia which does not contain any federal prisons. You’ll need to go through the same steps I did:

  • Create an NA aeshetic
  • Override the guide aesthetics
  • Set the na.value for the fill aesthetic
Solutions
Learn More

In this video I talk about viridis being the single best choice for a continuous color palette. This is because the color palette works well for folks with colorblindness and is perceptually uniform – which means it’s easy to know if you’re looking at a low or high value on the scale.

Have any questions? Put them below and we will help you out!