Re: [Flightgear-users] List of Airports in FlightGear

[Martin O. <mo...@ad...>]

On 2001.09.27 19:37 David Findlay wrote:
> On Fri, 28 Sep 2001 07:05, Curtis L. Olson hit his keyboard with his head
> and=20
> the result was this:
> > Alasdair Campbell writes:
> > > You will find then in default.apt.gz in the Airports directory in the
> > > base package.  Meanwhile can someone tell me an easy way to display
> the
> > > contents of the mk4 files in the same directory?
> >
> > Those are generated directly from default.apt.gz data file so there
> > nothing additional or different in them.
>=20
> What we need is an Airport Dialog box with a scrolling map and a list of=
=20
> airports... I haven't had time to do it, but I finish school for good in
> 3=20
> weeks!
>=20

Well, you can use a utility named Atlas.
See http://atlas.sf.net/
It has not all the features you request, but anyway it is much more
practical than reading the default.apt.gz file if you want to locate an
airport.

Now, I do the reverse question:
How can I add an airport? The airport is in the Scenery, but doesn't appear
in the default.apt.gz file.
And very important, after adding it, with its many parameters, do I have to
make something with the mk4 files?

So, in order to edit the default.apt.gz file, I must understand completely
the lines in this file, and using the same example that David Megginson
used, the entries in this file for the JFK airport of New York is:

A KJFK  40.639751 -073.778926     13 CYN New York John F Kennedy
International
R 04L  40.635404 -073.775126 030.66  11351 150 YAPHN NYNN      0      0
NNNN 0      0
R 04R  40.635331 -073.762605 030.67   8400 150 YAPMN YNNC      0      0
YNNJ 0      0
R 13L  40.650746 -073.774759 120.86  10000 150 YAPHN YNVB      0      0
NNNJ 0      0
R 13R  40.638136 -073.794154 120.84  14572 150 YAPHN NNVN      0      0
NNNN 0      0
   =20
The line that begins with the A indicates the airport entry.
Then comes in order:
1) the Identity code
2) its geographical coordinates (the coordinates of what exactly?)
3) A number and a code (any one knows what they mean?)
4) The name of the airport

Then comes the R lines, which specify the runways:
1) The heading (with respect to the magnetic poles, I think) of the runway.
Also this number will appear at the ends of the 	 runway
2) Its geographical coordinates (of one of the ends I suppose. If I'm wrong
please advise)
3) The true (geographical) heading
4) Its lenght in feet
5) Its width in feet
6 and so) codes that I cannot understand (please clarify those who know)

Then comes T entries (that not all the airports have) that I dont know what
they are (may be secondary runways?)

Sorry for those many questions in the same message. Please be patient :-)

Thanks.