[Tagging] Linking Sidewalks to Highways
osm at bavarianmallet.de
Mon Sep 21 15:09:38 UTC 2020
Am 21.09.2020 um 14:54 schrieb Paul Allen:
> On Mon, 21 Sep 2020 at 11:06, Supaplex <supaplex at riseup.net
> <mailto:supaplex at riseup.net>> wrote:
> The problem remains that physically non-existent road crossings
> ("wildly crossing the street"), which in reality represent a
> crossing possibility for many users, are still not available for
> routing. In my opinion, this problem is not very relevant if
> separate ways are well mapped (which they often are unfortunately
> not!) and all essential routable connections are in the database.
> At the beginning and at the end of the route, people can use their
> brains ("destination across the street") if their routers do not
> solve this task for them.
> This isn't as simple as you make out. Assume that I am at point A and
> wish to
> go to point B, which involves a "wild crossing" at some point between
> the two.
> However, there is a real crossing at point C, a mile beyond point B,
> A router
> will direct me to travel to point C (a mile further than my
> destination) in order
> to cross the road there, so I can then walk a mile back to B.
You really walk a mile beyond and back again, knowing your destination
is - say 10-20 m - across the street?
Or do you not know that your destination is at the street you walk along?
I call those assumes a 'theoretical island problem'.
a) Your point A is as near at point B, that you know or can estimate
where you have to cross.
b) Your point A is so far away from point B , that there is - or at
least should be mapped - another possible crossing before ('virtual'
connection at a T-crossing or similar) .
c) Most routers have a display - and the view should show your
destination (or route path to) across the street.
Maybe my view of a) and b) is a bit european centric - but I assume
foreign cities would match and for foreign countrysides the seperate way
problem would not apply.
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