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Watching cities grow-New algorithms for evaluating satellite data
According to United Nations estimates, today approximately half of the world's population is already living in cities. The new method makes it possible to detect and visualize changes as small as one millimeter per year. The data for the new urban images come from the German TerraSAR-X satellite, the most high resolution civilian radar satellite in the world. Orbiting the earth at an altitude of approximately 500 kilometers since 2007, the satellite sends microwave pulses to the earth and then collects their echoes.
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