Thank you for your help. I find a simple way to calculate the altitude above
ground with the help of Mathias' e-mail.
For a null or a new FDM, to calculate the altitude above ground :
_update_ground_elev_at_pos(); // Runs the ground queries
get_Runway_altitude() // This function returns the height
above ground or terrain.
Of course we can use the function is_valid to distinguish the sea and
ground. Now I'll try is_valid.
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