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Since Android 9, there is an option in your location preferences which is called Location Accuracy.

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I know how Google determines my location over wifi and now I wonder if Location Accuracy has also the purpose of feeding new locations of accesspoints to Google.

Is this correct? If yes, has anybody an official statement to that?

If no, how does Google refresh their location-data of APs(, besides wardriving)?

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I wonder if Location Accuracy has also the purpose of feeding new locations of accesspoints to Google.

Yes,When you select the option to pin point you they use a wide variety of things.When it does do they also send data to better those services.Google initially started mapping wifi points using cars.

This summer it was revealed that Google Street View cars, besides taking photos of your neighborhood, were also collecting the street addresses, Wi-Fi service set identifier (SSID), and the unique Media Access Control (MAC) identification information for computers, Wi-Fi access points (AP)s, and routers

As for using your data to better their geo location services is also true. Here is the official statement of such

Most mobile phones are equipped with GPS, which uses signals from satellites to determine a device’s location – however, with Google Location Services, additional information from nearby Wi-Fi, mobile networks, and device sensors can be collected to determine your device’s location. It does this by periodically collecting location data from your device and using it in an anonymous way to improve location accuracy.

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