Earlier this week I posted a map developed by the real estate web site Trulia showing where straight, single men and women live in various US metropolitan areas. In the course of researching that I came across Trulia Hindsight, an interactive map that lets you track housing development from 1870 through the present.
That's a screenshot of San Franciso, above, but the animation (which I could not embed) is the best part. Housing is overlaid on a map of the countryside as it looks now, so you can see development relative to roads. You can also change the zoom for greater detail. It's a fascinating site, and a great use of data.
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