Altitude definitions

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hMSL: booz_gps_state.hmsl is height above mean sea level (height above geoid)
gps altitude: booz_gps_state.lla_pos.alt is height 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

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