So the first great thing about Google’s new Maps is the underlying data. Hundreds of Google employees have spent years hand-editing the maps, fixing the thousands of errors that people report every day. (In the new app, you report a mistake just by shaking the phone.) And since 2006, Google’s Street View vehicles have trawled 3,000 cities, photographing and confirming the cartographical accuracy of five million miles of roads.
Alexis Madrigal agrees:
If you want to know why Google's Maps are better than Apple's, check out my feature on how Google builds its maps. This is not an easy problem to solve. You need thousands of people hand-correcting maps in addition to all the computational and brain power that money can buy. And those maps will never be perfect; the task never ends.