Andy Ross said:

> Jim Wilson wrote:
> > One thing I noticed is the altitude-agl is reported at the gear
> > level by YASim, where JSBSim reports the distance of the nose above
> > the ground.  I'm not sure one is better than the other, but perhaps
> > this should be standardized.
> 
> I interpreted the "agl" level as a cooked altitude, as reported by a
> cockpit annunciator, for example.  The absolute altitude of the
> coordinate origin is (in principle, anyway, even if it's not available
> in the property tree) easily computable from the origin coordinates
> themselves.
> 
> We should definitely standardize it; if the "gear altitude" needs to
> move to a different property, that's fine.
> 

My understanding is the agl should simply be the "fdm's altitude-ft" less the
"ground elevation-ft directly under the aircraft".  I'm not sure by your
response if you are aware that the "agl" in altitude-agl is "above ground level".

Best,

Jim


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