Altitude definitions
From Paparazzi
- hMSL
- gps.hmsl is height in mm above mean sea level (height above geoid)
- gps altitude
- gps.lla_pos.alt is height in mm above WGS84 reference ellipsoid
- ground alt
- ground altitude (above hMSL) defined by flightplan
For a proper explanation of the differences see this.
JSBsim uses GEOCENTRIC instead of GEODETIC latitude and altitude see FlightGear CoordinateSystem
