Over the last few years the Centre of Advanced Spatial Analysis at UCL has created some interesting visualisations of data from Twitter. For example, CASA's, Tweet-o-Metre shows the current level of Twitter activity in a number of major cities around the world.
CASA's Interactive Tweetography Maps uses the Google Maps API to present a number of topographical maps of New York, London, Paris and Munich based on where in the cities Twitter users are most active. The contours on the maps show the density of tweets, with mountains showing the most active locations on Twitter.
Digital Urban has now taken the data from the London Tweetography Map and visualised it with the 3d game engine Lumion. They say they are still in the early stages of development but, I think you will agree, the results are already pretty amazing.
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