GNSS enhancements bundle

[alex-cit]

MerginMaps/mobile#4234

Internal provider (no external device)

Android

• fused is now by default

• system reports ellipsoid heights

• we transform to EGM96 by default

  • geoid height + ellipsoid height values are available

• transforming to chosen geoid is available and geoid height + ellipsoid height values are also available

iOS

• system reports msl heights

  • by default we do not do any transformations, simply accept whatever is coming from the system
  • geoid height + ellipsoid height values are not available

• transforming to chosen geoid - @Withalion ?

External provider - Mock

• If there is no transformation, we accept data as they come
  • geoid height + ellipsoid height values are not available
• Transforming to chosen geoid is available, but users must set the mock app to send ellipsoid heights, otherwise undulation would be applied twice

iOS

• iOS only sends a minimal subset of available GPS data - x, y, z (no accuracy,...)

External provider - Bluetooth

• Available only on Android
• If there is no transformation, we accept data as they come
  • geoid height + ellipsoid height values are available, but we do not know the selected geoid model
• transforming to chosen geoid is available and geoid height + ellipsoid height values are also available + we know the geoid model and show it in the app

External provider - Network

(same as bluetooth)

[Withalion]

Name of position provider has been changed if mock location is detected to "External (Mock)"

• Fix provider naming when using mock location mobile#4316

Variables

• new form variable @position_geoid_separation
• new form variable @position_elevation_ellipsoid
• new form variable @position_elevation (will have the same value as @position_altitude) Return altitude variable mobile#4333
• @position_provider_name will be "External (Mock)" if mock location is detected Fix position provider name variable mobile#4348

Android

seems right

iOS

• system can send us both orthometric and ellipsoid elevations, we prefer ellipsoid
  • if ellipsoid elevation is not available we don't transform received elevation, separation is not available
  • if ellipsoid elevation is available transform to EGM96 by default (other geoid if set), separation is available

External - Mock

• seems correct, by geoid height do you mean separation?
• also I would say both android and ios send subset of available data because of the system limitations

Android

• detected only on fused provider, not internal

External - Bluetooth

seems correct

External - Network

correct, but should be available on all platforms