Celebrating 40 years since the Landsat satellite system was launched into space, NASA and the U.S. Geological Survey have released images showing how 11 world cities have changed over that time, writes Nate Berg. "This site features two overlaid images of each city from different years dating back to the 1970s, with a cool slider bar to let you see how each city has changed."
The overlaid images document growth in cities such as Tokyo, which grew by 7 million people; Las Vegas, where the incredible advance of the city into the desert and the associated reduction of water in the nearby Lake Powell reservoir are clear; and Dubai, capturing "One of the best examples of the instant megacity."
