[OSM-talk] Need help with mathematics for runways

[Jon Burgess]

On Fri, 2007-04-20 at 08:11 +0200, Hakan Tandogan wrote:
> Hi everyone,
> 
> The x-plane.org airport runway data (which is derived from DAFIF, which 
> is public domain) defines runways with lat/lon of the center of the 
> runway, the direction (against true north) and length in feet.
> 
> I'd like to derive from that data the lat/lon of the two endpoints of 
> the runway, if possible with the smallest amount of distortion due to 
> small float variables.
> 
> Is the formula given at http://williams.best.vwh.net/avform.htm#LL 
> (Lat/Lon given radial and distance) the correct one to use or would I 
> have to set up a PostGIS server and feed my source data into it? If so, 
> is there any example source for perl and/or java and postgis?
> 
> 
> Regards,
> Hakan
> 

The original DAFIF runway data file (ARPT/RWY.TXT) contains the two end
points of the runway so you can use this as a direct answer if you have
it.

I wrote a script to convert DAFIF airport and runwat data to OSM but
I've never uploaded it to SVN since no one has provided a clear 'ok' as
to the legal status of using the data. Perhaps it would be ok provided
we included a suitable source tag?

Let me know if you want a copy of the script.


	Jon