Re: Advice needed: rwy dist rem sign installation

On Wed, 15 Dec 2004 19:12:35 +0100
Jorge Van Hemelryck <[email protected]> wrote:
>
> Just to make sure... Are the distance and the step between signs
> configurable ?
> 
> What I mean is, instead of having "9" then 1000ft further "8", you could
> have "30" then 300m further "27"... Unfortunately, I don't currently
> have any official (ICAO or JAA) document about it, but IMHO, we could
> start by applying the FAA rules but with other units.
> 
> If you haven't done it, would it be hard to do ? I'm sorry, I'm too lazy
> to learn python right now (it's python isn't it ?)...

This is something I was trying to learn about early on -- do other
countries do this the same way as the US?  It's certainly done ticking
off 1000's of feet here; I don't know how it's done elsewhere.  I'd
naively think the ICAO would want things to be the same everywhere,
so as not to confuse international pilots, even if feet are lousy
units.  But I haven't been able to verify this.  The FAA docs that
describe what's done here are free-of-charge on the web; the relevant
ICAO doc (presumably Doc 9157P4, Aerodrome Design Manual Pt. 4, Visual
Aids) costs $109, which I don't have.

So since I had no idea whether it was even necessary, I haven't done
this.  But it would be trivial to implement -- just replace a few
numbers with parameters defined in an accompanying imported module,
which isn't a bad idea with some other constants anyway.  It would
take maybe 3 minutes.  The real trick is having a simple way to relate
airports (by ICAO identifier, by lat/lon, whatever) to the particular
unit/interval used.

-c

-- 
Chris Metzler			[email protected]
		(remove "snip-me." to email)

"As a child I understood how to give; I have forgotten this grace since I
have become civilized." - Chief Luther Standing Bear

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