Hi Greg, The tower altitude is most likely above Mean Sea Level.
Daniel E Quoting Greg Hawkes <g...@onemancoding.com>: > Hello all, > > FlightGear's "Tower" view at my local airport (Melbourne's Tullamarine, > YMML) is about 300 metres from the actual location of the air traffic > control tower. I would like to change the Tower View's "From" location > to correspond to the actual location of the tower. > > I thought I could do this easily by editing the apt.dat.gz file in > FlightGear's ~/Airports/ directory. I gunzip-ed, edited, and gzip-ed the > file, and updated the "14" record for YMML as follows: > 14 -37.669465 144.830636 0 0 ATC Tower > > (These coordinates were obtained from Google Earth.) > > However, when I run FlightGear the view location of the "Tower" view is > unchanged. When I browse the internal properties, I find the following > values: > /sim/tower/airport-id='YMML' > /sim/tower/altitude-ft='483' > /sim/tower/latitude-deg='-37.66919517' > /sim/tower/longitude-deg='144.8451658' > > Obviously these values do not correspond with those I have inserted into > apt.dat.gz. Where does FlightGear obtain these values? > > The "altitude-ft" parameter is curious. According to this site > http://www.airservicesaustralia.com/aboutus/facilities/towers/melbournetower.asp > > ...the cabin is 120 feet (about 37 metres) above ground. Where does > FlightGear get its "483 feet" value? What is the datum for this number? > > Does FlightGear make use of the apt.dat.gz file to initialise its > airport data? If not, what is this file used for? > > Regards, > Greg Hawkes > > ------------------------------------------------------------------------------ > Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are > powering Web 2.0 with engaging, cross-platform capabilities. Quickly and > easily build your RIAs with Flex Builder, the Eclipse(TM)based development > software that enables intelligent coding and step-through debugging. > Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com > _______________________________________________ > Flightgear-users mailing list > Flightgear-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/flightgear-users > ------------------------------------------------------------------------------ Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are powering Web 2.0 with engaging, cross-platform capabilities. Quickly and easily build your RIAs with Flex Builder, the Eclipse(TM)based development software that enables intelligent coding and step-through debugging. Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com _______________________________________________ Flightgear-users mailing list Flightgear-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-users
