SAN FRANCISCO--Google Maps began as roads and satellite photos. Now, through a project called Ground Truth, it's becoming an ever more sophisticated virtual mirror of the real world.
But how? Google engineers described their methods Wednesday at the Google I/O show, describing how they've moved from licensing satellite photos to building 3D version of the world that can be updated in minutes.
The answer might surprise close Google watchers accustomed to the company's heavily automated, algorithmic, computer-centric way of doing things. There's plenty of that, but it also takes lots of elbow grease, said Michael … Read more