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2.8 Choropleth Maps

In today’s lesson, I will discuss Choropleth maps. It’s not a word that you hear very often. These are graphics that show how data varies geographically. Color or shading of different areas on a map is used to represent the values. We will look at how to make these graphs and put them to work for you.

  • Only use a map when geography is relevant: Simply showing two different values on a map adds no meaning to the data.
  • Don’t be random with your colors: A graduated monochromatic color scheme is better.
  • Don’t use thick lines around your shapes: The borders are meant to frame the data, not compete with it.
  • Don’t use smiley faces!