FlightAware Discussions

How do we know the type of altitude info that is being returned?

I’ve read that ADS-B reports both barometric (pressure altimeter) and geometric (usually from GPS) altitudes, so my question is how do we know which type of altitude is being reported? I am using the GetLastTrack function in FlightXML2.0.

Altitudes from FXML (and shown on the main website etc) are typically uncorrected pressure altitudes.

We do collect GNSS altitude from ADS-B but it’s not plumbed all the way through the server-side processing at the moment.

If you’re collecting ADS-B data locally, Skyview/Skyaware shows both altitude when available.