Am 11.04.2012 11:35, schrieb Martin Koppenhoefer:
in the case of parallel ways it is impossible to tell whether you can
filter them out or not (there could be a separation or they could be
on different height levels), especially if people are mapping
sidewalks the same as separated footways.
Thats a point - and the differentiation should be really considered in
the tagging.
My main concern is routing,
not rendering. I wouldn't take them into account in routing, because I
feel you would get worse results.
E.g. 100 m South of the spot you posted above:
http://www.openstreetmap.org/?mlat=53.865988&mlon=27.651201&zoom=18&layers=M
Imagine you stand there and want to go to the parking on the other
side of the road:
You take very 'short way' examples - to show the point of concern, thats ok.
But these are examples where - I think - no one would even consider to
use routing.
On the other hand:
1.
Use 'practicable' examples (far longer ways) and you will see, that many
(not all) of these 'problems' fade away, because the routing will use
those crossings anyway and lead to the right side before .
If there is no sidewalk on the destination side or another adequate
footway - it will use your approach anyway ...
2.
A person who can see the situation can see the routing too - and may
shorten the route on his own risk.
A person who does not .. well, I would not recommend them a shorting
anyway ...
Another similar issue is that with these sidewalks people often don't
connect crossing footways to the street, they only connect them to the
sidewalk. There are examples for this also in your area, so
unfortunately simply omitting them won't do the job either, because
you would get gaps near crossings.
A crossing footway over a street with bothside sidewalk must not always
be connected to the street - carriageway and sidewalk are considered as
different transport route with different usage then.
For routing there is no need to connect them.
For renderer there is no need to consider which is top or bottom - he
may choose itself by usage preference. (Distinction of bridge and
tunnel presumed.)
The signal points or the 'consider a hazard' points may be outside of
the crossing point itself.
Connections are only needed at points where you can really use a parting
transport way (which may be a street without sidewalk).
Third, try to cross these not on the crossing staying alive:
http://upload.wikimedia.org/wikipedia/commons/thumb/1/14/Partyzanski_praspekt_8.jpg/300px-Partyzanski_praspekt_8.jpg
http://kp.ru/f/4/image/26/67/396726.jpg
I'll do next time I visit your town. What should be the problem? You
wait until there is no car coming or all cars stop and then you cross.
Yes - I see, you have _seen_ the point already. ;-)
cheers,
Georg
_______________________________________________
Tagging mailing list
Tagging@openstreetmap.org
http://lists.openstreetmap.org/listinfo/tagging
