An intersection in my town just converted from a 4 way light to a roundabout, and the gps was changed to reflect within a week. Who does this and how???
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A lot of people use for instance google based gps apps. Each travel creates a track. When lot of new people create tracks which are not in the system (mismatch identified compared to existing road segments) a simple algorithm can flag this anomaly. Then map editors can compare this to fresh satellite images (most areas pictured daily) and redraw the road segments.
Waze, Google also relies pn community updates so let users report changes and provide map editing software too for that.
Waze also has interfaces for governmental agencies so the road authority can set closures, initiate changes.
Gps satellites does not do much just emitting a signal periodically and communicating the time and where they are. Your device is responsible to calculate you position based on satellite info (your device has to see at least 4 satellites to lock you on earth)
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