Map data from third parties requires manual verification, as we learned from the Apple Maps debacle. Google does this [1]: > Google employs a small army of hu

Map data from third parties requires manual verification, as we learned from the Apple Maps debacle. Google does this [1]: > Google employs a small army of human operators (they won’t say exactly how many) to manually check and correct the maps using an in-house program called Atlas. A Maps app isn't just another app. Nobody gets killed if the Stocks app shows an incorrect price, but someone could die if the Maps app uses incorrect mapping information. [1] http://www.wired.com/2014/12/google-maps-ground-truth/ http://www.wired.com/2014/12/google-maps-ground-truth/