[Enhancement] Provide accuracy of altitude in GeoLocation API #1099
Description
Summary
Currently, the Xamarin.Essentials.Location class only includes one Accuracy property, which (I assume) describes the horizontal (or overall?) accuracy of the location. However, the vertical accuracy (concerning the altitude) can differ from the horizontal accuracy quite substantially, e.g. depending on whether a barometer is available or not.
API Changes
In the simplest case, an additional property Xamarin.Essentials.Location.AltitudeAccuracy could be added.
Alternatively, one could introduce a new class for representing altitude information, which could include properties like Value and Accuracy (or similar). This would be a more disruptive change of API, though.
Intended Use Case
The primary use case would be any situation where the user needs a good estimate of how accurate his own location is known, both horizontally and vertically. I'm mainly having augmented-reality scenarios in mind, but there are certainly other applications where this is important.