La Geografia de la PSU is a Google Map of university entrance exam results for schools in Chile.
The size of each circle reflects the performance of the institution. The colors indicate the type of school (blue = private, green = public, orange = private but subsidized by the government). Users can click on the circular polygons to view the results in more detail, including the test results for each subject.
I like the use of scaled circles on this map to show the level of the university entrance exam results. It is very easy to create a similar map with the Google Maps API using polygon circles. You can view an example on the Google Maps API v3 Documentation website, where polygon circles are scaled to represent the population size of US cities.
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