Modifying map colors

ggplot2 version 3.0 integrated the viridis color palettes, which are perceptually uniform and legible to colorblind individuals and in black and white. For these reasons, the viridis palettes have become very popular for data visualization, including for choropleth mapping. In this exercise, you'll learn how to use the viridis palettes for choropleth mapping in ggplot2.

This exercise is part of the course

Analyzing US Census Data in R

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Exercise instructions

Set a color aesthetic to align the color palettes of the tract fills and tract boundaries.
Use scale_fill_viridis_c() to request a continuous viridis palette for the tract fill.
Use scale_color_viridis_c() to request a continuous viridis palette for the tract borders.

Hands-on interactive exercise

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

# Set continuous viridis palettes for your map
ggplot(___, aes(fill = ___, ___ = estimate)) + 
  geom_sf() + 
  ___() +  
  ___()

Edit and Run Code