On 10 Nov 2011, at 07:36, HB-GRAL wrote:
> - Approach Fix
> - Intermediate Fix
> - Final Fix
> - MAPT
> - Step down
> - Fly-by
> - Fly-over
> - Co-located
> - Speed limit (?)
>
> Is there any possibility to "classify" the bare 8.50 fix database
> somehow, i.e. by name ? I can also start to provide other sources, but
> then the fix database needs updates outside xplane. Another question is,
> are current fixes also used for AI Traffic ?
Some classification would be useful, but all the thins I think you're actually
asking for, are related to approach & departure procedures, AKA SIDs / STARs
... or whatever the correct terminology is today :)
And in that regard, there's other sources data available, which have a much
richer data-syntax (XML) that encodes most of the things you mention above
(speeds, fly-over vs fly-by, IAF / FAF points, step down altitudes). FlightGear
already supports reading one of these formats (the Level-D 767 format), and
there are files available here:
http://www.navdata.at/php/sidstar/dl_list.php?addon=LDS767
If you add, inside your Airports/I/C/A structure, the files for an airport,
renamed to ICAO.procedures.xml, then the route-manager will load and use it.
(based on runway, you can select a SID or STAR, and the waypoints are added to
your route) At runtime, it's the various flightgear::Waypt subclasses that
model the information mentioned above. And the GPS will attempt to fly the
procedures, although compliance with altitude / speed limits is currently
missing.
Now, one step would be to make the AI traffic use this data if available, but
there other issue, I've been busy on other areas since I added this code, so it
has bugs - eg holds aren't support correctly, neither are DME arcs, and some
DME intercepts don't work. All fixable, but it hasn't been a priority, since
the feature is deliberately not exposed too loudly right now :)
(Adding support for other input formats is possible, the Level-D format was
simply the sanest of the ones offered on navdata.at. Also note the files are
free to download, but GPL incompatible, so we couldn't ship them in the core
data package)
James
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