TED talks are amazing!! The fact I can watch them on my huge TV via my Apple TV or Wii makes the experience even better (not to mention the excellent iPhone app). This talks looks at the use of GIS and 3D modelling to genertate the historic landscape of Manhattan prior to the settlement we are used to.
"400 years after Hudson found New York harbor, Eric Sanderson shares how he made a 3D map of Mannahatta's fascinating pre-city ecology of hills, rivers, wildlife -- accurate down to the block -- when Times Square was a wetland and you couldn't get delivery."
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