Visualizing Spatial Relationships - Data Points: Visualization That Means Something - page 286

any case, this is usually how you're going to use your spatial data, so now
learn to visualize it.
Color by Data
Choropleth maps are the most common way to map regional data.
Based on some metric, regions are colored following a color scale that
you define, as shown in Figure 8-11. The areas and location are already
defined, so your job is to decide the appropriate color scales to use.
FIGurE 8-11 Choropleth map framework
As touched on in a previous chapter, Cynthia Brewer's ColorBrewer is a
great way to pick your colors, or at least a place to start to design a color
palette. If you have continuous data, you might want a similarly continuous
color scale that goes from light to dark, but all with the same hue (or mul-
tiple similar hues), as shown in Figure 8-12.