getHorizontalDistanceFromBeacon

Returns a conservative estimate of the current maximum horizontal distance to the beacon. This value will increase over time as the estimated distance becomes increasingly uncertain until a new measurement is received.

d = distance to beacon based upon RSSI v = vertical distance between the beacon and the device the user is holding (if on that particular floor)

d² = h² + v²

⇒ h = √(d² - v²)