Frederick C. Hixon

Satellites reveal cities' 'urban pulse,' tracking neighborhood growth in near real time

Satellites reveal cities' 'urban pulse,' tracking neighborhood growth in near real time Robert Egan Associate Editor For over a century, doctors have used electrocardiograms (EKGs) to render the invisible electrical activity of the human heart visible, using the pulse to diagnose disease before it becomes fatal. Now, scientists have invented a way to do the exact same thing for the places where most of humanity lives: cities. In a recent study published in the Proceedings of the National...