Re: [Flightgear-devel] weather conditions and winds aloft notworking correctly..

[Scott H. <sco...@po...>]

On Fri, 2010-07-23 at 12:01 -0400, Jacob Burbach wrote:

> Thanks for the quick work on this Torsten...with the exception of dew
> point and altimeter settings everything else appears to be working
> properly now. Currently I don't think dew point and altimeter are a
> big deal for what I'm doing personally, but they are/were seemingly
> intended to work so should probably be addressed as well.
> 
> Thanks again, cheers!
> --Jacob



I'm not sure if it is related to this change, but since I did a GIT pull
of simgear, flightgear, fgdata of 24 July and rebuild of simgear and
flightgear, the ground elevation seems to become incorrect after flying
at high altitude.

Scenario:
I assume the inner (left) altitude of the standard HUD is AGL, the outer
(right) altitude is the ASL
* The ground elevation as reported on the standard HUD starts out
correct (25ft AGL 398ft ASL) at EDDF with QNH 1022
* climb to cruise of FL330 and set Std settting on barometer (29.92
to /instrumentation/altimeter/setting-inhg)
* start my descent into EGLL
* flying over the sea between France and UK I notice that the ground
elevation report by the HUD is out by 800ft compared to the ASL (this is
probably at around FL280) 
* at 18000ft I set the barometer
(/instrumentation/altimeter/setting-inhg) 1021 QNH as reported by METAR,
which is converted to inHg
* on approach to EGLL the AGL is out by around 1600ft at around 8000ft
ASL
* on final approach to EGLL the AGL is now around 2100ft out compared to
the ASL 
* the terrain is rendered and looks like it is around 2000ft below,
however the GWPS starts warning of terrain
* and then I crash into the invisible ground while appearing to be more
than 2000ft in the air

The command line for the above scenario was;

bin/fgfs --log-level=error --enable-sound --enable-hud
--enable-real-weather-fetch --airport=EDDF --aircraft=A380
--atlas=socket.... --multiplay=out,... --multiplay=in,... --callsign=..
--prop:/sim/ai-traffic/enabled=false
--prop:/sim/traffic-manager/enabled=false --prop:/sim/atc/enabled=false
--parkpos=A22


Now I'm fairly sure London isn't 2000ft ASL. Is there some properties I
can watch to see what is going wrong here?


S.