NASA images show before-and-after scenes of Earth
As many a medieval castle-builder knew, the view from above is a privileged one.
For several decades, the agency’s Earth-observing satellites have been capturing dramatic views of land-changing events such as fires, tornadoes and mudslides. To see individual glaciers receding, however, the app’s ground-based photos showing green meadows replacing icebergs make the point best.
Urban change proves equally profound: An 1830s map alongside a satellite view of modern Boston shows that some of the country’s most expensive real estate occupies land that, until fairly recently, was underwater.