This week we discussed flow maps, network maps, spatial metaphors and cartograms. This final flush of models completes our initial survey of map types going into the week when you will create a potential entry for the bizarre map challenge.

For your post this week, pick one example of any of these four types of maps and critique it following Bertin’s theory of graphics:

• what is the invariant?
• what are the components?
• how are the components mapped to visual variables?