Dan Stutzman

How to make choropleth maps with Google Fusion

Published 2011-12-03

Choropleth maps are maps in which the regions are colored according to some data value for that region. For example, in the following map the U.S. states are red if both senators from that state are Republicans, blue if both are Democrats, and purple otherwise:

Map showing party of 112th United States Congress senators by state
(some rights reserved)

I've created screenshot walk-throughs to show you how to create these kind of maps with free tools, either Google Fusion or GeoCommons. I originally presented these at the December 3, 2011 meeting of the Colorado Hacks/Hackers (journalists and technologists) group.