How long does it take to create an accurate 3D model of a city on a computer? If you’re familiar with virtual reality modeling, you know it can take weeks. But according to New Scientist, engineers from the University of California at Berkeley have found a speedier way to capture a city.

Using a concept dubbed “virtualized reality,” which mixes inputs from lasers to measure distances and digital cameras to scan a city, they can now build a 3D model of a whole city in about an hour. Obviously, the first applications will be military, but sooner or later, you’ll be able to drive your car in an unknown city using this 3D technology.

This overview contains more details, pictures and references about this new way to build a model of a city in 3D.