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CityLab, discussing newly developed tool that demonstrates Aaron Renn’snew/old donut” models:

A new study published by the Demographics Research Group of the University of Virginia’s Weldon Cooper Center for Public Service analyzes the demographic trends of 66 major U.S. metros, measuring how they change with distance from the city center. The report’s charting tool helps visualize the data on an “objective, intuitive spatial scale” rather than on subjective “urban”/“suburban” categories…

It’s fun to select your city and see the charts. One of the most interesting tables for Chicago, for example, is population density: it shows a 10,000 person per square mile increase in the city center from 1990 to 2012.