eli5: How can Google maps know many small and recent businesses’ locations so accurately?

Question

I’ve realised that most businesses (even small kiosks) are seen on Google maps. Where and how do they get that information?

In: 2928

Answer 1

You think that’s impressive, go look at OSM. You can practically navigate by chewing gum.

Every time my local river floods, and covers the small island in the middle, someone removes it within about 1 minute.