altitudeAccuracy
AltitudeAccuracy is a geolocation attribute that indicates the estimated uncertainty of the altitude value for a reported position. In web and mobile location APIs, it is provided as altitudeAccuracy, measured in meters, and applies to the altitude component of the position. The corresponding altitude is typically given as height above the reference ellipsoid (geodetic height); altitudeAccuracy may be null if the device cannot determine vertical error.
In practice, altitudeAccuracy is often interpreted as the vertical uncertainty of the altitude measurement, commonly viewed
Altitude data can come from different sensors, notably GPS, barometers, and sensor fusion systems. Barometric altitude,
Usage and implications: altitudeAccuracy helps applications assess the reliability of the vertical component when presenting 3D