Re: [Flightgear-devel] altitude agl

[Curtis L. O. <cur...@fl...>]

Melchior FRANZ wrote:
> We have /position/altitude-agl-ft in the property tree (-0.1946648994 ft).
> But what the (old) HUD code uses for "RadioAltimeter" is
>
>   /position/altitude-ft - /position/ground-elev-ft = 6.202537
>
> Clearly, the 6 ft make more sense than any negative number. What why
> is altitude-agl-ft wrong? I'd need the 6.202537 in the property tree.
> How would I call it? /position/correct-altitude-agl-ft, or what?  :-}
>
> m.
>
>
>   /position/altitude-agl-ft =   -0.1946648994
>   /position/altitude-ft     = 4527.586407
>   /position/ground-elev-ft  = 4521.38387
>   

Could this have been introduced early on as a hack to compensate for a 
difference between the wheel contact point and some aircraft reference 
point higher up on the aircraft structure?  It looks pretty suspect to me.

Curt.

-- 
Curtis Olson        http://www.flightgear.org/~curt
HumanFIRST Program  http://www.humanfirst.umn.edu/
FlightGear Project  http://www.flightgear.org
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