D3js with Maps

This is the live demo for the final result of this guest post in Safari Books Online Blog.You can check the guest post to see how this demo is built.

In the below chart, we use circles to visualize Taiwan Population data with political affiliation in County level. There's one circle for every county; you can identify the corresponding circle of a county by matching its outline color with the county.

Circle radius represents popluation in corresponding county.
Circle color represents the political affiliation in corresponding county.