How does Google know that this exact tiny restaurant on the 4th floor of a building full of other restaurants and cafes is “usually busy at 8pm on Wednesday”?
In: 70
They scrape web data and collect data from android devices with location services turned on.
Google knows the location of phones thus people, and when they start entering the resturant. And a modern GPS fix is 3d, so there is altitude information in there as well. If you take the location altitude and subtract the terrain altitude you can make an accurate enough calculation as to what floor someone is on.
You should definitely turn off location information collecting, or the service off completely when nit using it.
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