Visualizing Spatial Relationships - Data Points: Visualization That Means Something - page 307

FIGurE 8-30 Change in urban population from 2005 to 2009
FIGurE 8-31 Proportion of people living in an urban area in 2005
Figure 8-32 shows the same data for 2009. It looks similar to Figure 8-31,
and you can barely notice a difference.
For this particular example, it's clear that the single map is more informa-
tive. You have to do a lot less work mentally to decipher the changes. It's
obvious that although many countries in Africa have a relatively lower per-
centage of their population living in urban areas compared to the rest of
the world, they have also changed the most in recent years.