altitudeAccuracy property
Altitude accuracy in meters.
If this location does not have a altitudeAccuracy, then -1 is returned.
iOS
When this property contains 0 or a positive number, the value in the altitude property is plus or minus the specified number of meters. When this property contains a negative number, the value in the altitude property is invalid.
Determining the altitudeAccuracy requires a device with GPS capabilities. Thus, on some devices, this property always contains a negative value.
Android
We define vertical accuracy at 68% confidence. Specifically, as 1-side of the 2-sided range above and below the estimated altitude reported by altitude, within which there is a 68% probability of finding the true altitude.
In the case where the underlying distribution is assumed Gaussian normal, this would be considered 1 standard deviation.
For example, if altitude returns 150, and altitudeAccuracy returns 20 then there is a 68% probability of the true altitude being between 130 and 170 meters.
Implementation
late double altitudeAccuracy;