How Tesla stands apart from the others is the way it’s acquiring this data: through drivers. Every Tesla Model S, with Autopilot or not, is connected from the cloud; the company is constantly connecting data from each of its cars. Tesla is using the data it has, and will continue to collect, to develop its maps.
Elon Musk called this a “fleet learning network” where all its cars contribute to a shared database. “When one car learns something, all learn,” said Musk.
Musk highlighted a section of I-405 in California, a highway where lanes are terribly marked. Using the information from Model S drivers traversing this specific section of road, Tesla’s Autopilot can still function well, even in the absence of lane markings.
An important distinction from Google’s. More from here.