[talk-au] Melbourne Airport (mapped as both node and way)
Warin
61sundowner at gmail.com
Thu Oct 1 11:17:34 UTC 2015
On 1/10/2015 4:50 PM, Ian Sergeant wrote:
> I guess I was talking about navigating there by aircraft.
A 'point' calculated for an aerodrome area would be good enough until
you had to select a runway .. where you would want the end points of the
runway .. not the node of the aerodrome (most of them look to be place
on/near the main building anyway).
> For passengers, sure you'd want a passenger terminal location, and an
> entrance to the same.
>
> Ultimately, regardless of what form of transport you use, you are
> going to be navigating to a point. The question is there an automated
> algorithm that can calculate a reasonable point, or does this need to
> be placed manually. It seems not for passengers. I'd argue there
> probably isn't in general.
Agreed.
A person will (should that be a 'reasonable person'?) use their eyes to
look for what they want .. not just follow the GPS thus any
discrepancies of, say, 100 meters should not matter too much as the
vision should direct them to the correct place.
One hopes the aircraft pilot has even more motive to use there senses to
get to the correct place! They certainly have a better view of things.
>
> For Sydney Airport, they have just opened up all that land on the
> other side of the canal - and the runways themselves extend way into
> the bay. It's complicated to calculate a reasonable point.
But if you are landing at a major airport .. you won't be using a GPS
.... certainly not alone!
>
> So, I do see it as roughly equivalent to the boundary/admin_centre.
> Where a basic centre of gravity algorithm works to convert a way to a
> node, then you probably don't need a node. Like a building. Where
> this type of algorithm doesn't produce a reasonable point, then I
> think we should at least have the possibility of placing a point manually.
>
> Ian.
>
>
> On 1 October 2015 at 16:06, Andrew Harvey <andrew.harvey4 at gmail.com
> <mailto:andrew.harvey4 at gmail.com>> wrote:
>
> When travelling to an airport, you normally travel to a terminal
> which are separately mapped, ideally with an entrance=main. Where
> would you put this point at say Sydney where international and
> domestic are on opposite sides? I think it's not the same as
> admin_center for admin boundaries.
>
> On 01/10/2015 2:01 pm, "Ian Sergeant" <inas66+osm at gmail.com
> <mailto:inas66%2Bosm at gmail.com>> wrote:
>
> Certainly when navigating to an airport, you need a 'point' to
> navigate to. An calculation of a valid airport point from a
> airport boundary that may often include industrial parks, etc,
> is problematic - verging on intractable. Having this point
> 500m off significantly breaks stuff.
>
> It's a similar issue to admin boundaries, where this issue is
> addressed with a relation and an admin_centre tag.
>
> Ian.
>
>
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