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 <[email protected]
<mailto:[email protected]>> 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" <[email protected]
<mailto:inas66%[email protected]>> 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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