Altitude definitions
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- 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
JSBsim uses GEOCENTRIC instead of GEODETIC latitude and altitude
see FlightGear CoordinateSystem
For a proper explanation of the differences see this.