Roy Vegard Ovesen wrote: >On Sunday 21 January 2007 17:42, Martin Spott wrote: > > >>Roy Vegard Ovesen wrote: >> >> >>>I asked on the developer list if anyone knew how ATC converted from >>>pressure altitude to altitude, because I think that would be the correct >>>way to do it. Does anyone know? >>> >>> >>How do you mean this ? They simply 'know' the reference pressure in the >>area where you're currently flying. It seems I didn't unterstand why >>you're asking .... >> >> > >What I'm asking for is an equation to convert from pressure altitude to ASL >altitude. Something like > ASL_alt = f(pressure_alt, ref_pressure) > > Likewise, not sure where you're going with this. ATC simply reports the current altimeter setting to the pilot. Above FL180 all altimeters are set to 29.92 or 1013. Encoding report aircraft altitude, otherwise ATC relies on what the pilot reports as aircraft altitude.
But you might try Ref. Aviation Formulary, Ed Williams, www.best.com/~williams/avform.htm for data on a standard atmosphere JW ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
