How does Google keep its Geolocation database up-to-date? [closed]

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I understand that Google used a wardriving kit in its Street View cars to bootstrap its map of wifi beacon landmarks.

But which data sources an开发者_如何学编程d methods do they use to discover and register new access points? Will they only feed in new BSSIDs submitted my Android phones with a valid GPS fix?

I set up two new APs (one of them dual 2.4/5GHz) and within two weeks Google had a fix for them, albeit 290m away from the real location. I will see if this fix will become more precise with time.

I’m fascinated by this but I didn’t find more details about how they do it.