[OSM-talk] Need help with mathematics for runways

[J.D. Schmidt]

SteveC skrev:
> I this is the same data that dutch_dk has been using then IIRC it was PD
> 
> On Fri, 2007-04-20 at 11:09 +0100, Jon Burgess wrote:
>> 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
>>
>>
>>
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>>

No, I didn't use DAFIF nor X-plane/flightgear data. I believe in going 
to the original source of the data, meaning the government dept that 
handles that information for the country you are in. In the case of the 
UK, that is the CAA, in the US it is the FAA and here in Denmark it is 
Statens Luftfarts Væsen (SLV).

The countries aviation authority should provide a means for pilots to 
download aerodrome information, in order for a pilot to plan flights in 
accordance with regulations.

In the UK, you can get the Aerodrome Charts from the AIP for the UK 
airports from this URL (registration necessary) http://www.ais.org.uk

In the US, for US airports from this URL : 
http://naco.faa.gov/index.asp?xml=naco/online/d_tpp

And here in Denmark you get it for the Danish airports : 
http://www.slv.dk/Dokumenter/dscgi/ds.py/View/Collection-28

I'll leave it up to the various residents of various countries to find 
the equivalent for their countrys aviation authority. It will exist, 
since AIS/AIP data is required to be available in order to plan a flight 
safely to a destination, and that information is required by ICAO to be 
freely available, in order for a country to be an ICAO member.

J.D. "Dutch" Schmidt