How Nepal's earthquake was mapped in 48 hours

The aftermath of the 7.8-magnitude earthquake that struck Nepal at 11.56 am on 25 April was chaotic. The quake struck at a depth of 9.3 miles, and combined with the tremors and aftershocks that followed has killed at least 5,000 people. That number is still growing.

That same morning, a different kind chaos sprang up thousands of miles away, in disparate directions, across the globe -- the effort to use data and satellite maps to help first responders before they even hit the ground.

That effort, to date, has seen 2,182 digital volunteers, trawling 14,700 km2 worth of high resolution satellite imagery, identifying 3,128 damaged buildings.

"In the week after a large event we are data carnivores -- anything that will make our job easier is used," Dale Kunce, helping coordinate the American Red Cross effort, told

This is how a natural disaster is mapped in 48 hours.