Re: [Paparazzi-devel] AGL and NavSetGroundReferenceHere()

[Pascal Brisset]

Hi,

what do you call AGL ?
- in the airborne code, NavSetGroundReferenceHere() sets ground_alt to 
the current altitude (common_nav.c:84).
This variable is for example use in HOME mode (nav.c:370) or in the 
Takeoff and Final block of the basic.xml flight plan.
- in the GCS, AGL is computed by subtracting the terrain altitude (from 
the SRTM model ... if the file is available in data/SRTM) from the 
current altitude

--Pascal

Martin P wrote:
> I use a flight plan with goround_alt=0 (derived from basic.xml).
> After calling NavSetGroundReferenceHere(), I would expect that the AGL is 0. 
> Instead, it is the altitude above sea level. The GPS mode is 3D and the AGL varies within 3 or 4 meters. 
>
> Is this the way it should be? Should I set the ground_alt to the actual altitude? 
>
>
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