Re: [Tagging] symmetrical guardrails

2015-07-12 Thread Volker Schmidt
My original question arouse from guardrails that separate a cycle path from
the road. The normal approach here is that the smooth inner side is
towards the car traffic and the rough side (support structure) towards the
cycle path. In the examples
http://www.mapillary.com/map/im/9-9-x8ynIiIdpNQHeA5CWg the approach is more
cycle-friendly  by offering smooth sides to both, cars and cycles. The
entire structure is maybe 0.3m thick. I was thinking of using an
additional tag like symmetric or both for these, as it would be a lot
of work to model them as double ways.

Volker
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Re: [Tagging] symmetrical guardrails

2015-07-12 Thread Tobias Knerr
On 11.07.2015 11:33, Joachim wrote:
 Just draw a closed way. This also represents the reality since there
 are two rails.

But no two set of posts etc., which would be assumed with your mapping.

I think two_sided=yes would work well:
http://taginfo.openstreetmap.org/keys/two_sided

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Re: [Tagging] symmetrical guardrails

2015-07-11 Thread Joachim
Just draw a closed way. This also represents the reality since there
are two rails.

2015-07-11 11:04 GMT+02:00 Volker Schmidt vosc...@gmail.com:
 The wiki page
 http://wiki.openstreetmap.org/wiki/Tag:barrier%3Dguard_rail
 says:
 If there is a clear inner/outer demarcation to the guard rail, construct
 the line so that the right side is inner and left side is outer.
 Often you find perfectly symmetric guardrails
 (example: http://www.mapillary.com/map/im/9-9-x8ynIiIdpNQHeA5CWg)

 I would like to tag this fact. Any examples or suggestions?


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Re: [Tagging] symmetrical guardrails

2015-07-11 Thread John Eldredge
Depending upon which side of the road the guardrail is on, either the left 
side or right side may be inner. If there is a distinct inner and outer 
side, the inner side will always be towards the traffic.


--
John F. Eldredge -- j...@jfeldredge.com
Darkness cannot drive out darkness; only light can do that. Hate cannot 
drive out hate; only love can do that. -- Martin Luther King, Jr.




On July 11, 2015 4:05:21 AM Volker Schmidt vosc...@gmail.com wrote:


The wiki page
http://wiki.openstreetmap.org/wiki/Tag:barrier%3Dguard_rail
says:
If there is a clear inner/outer demarcation to the guard rail, construct
the line so that the *right side is inner* and *left side is outer*.
Often you find perfectly symmetric guardrails
(example: http://www.mapillary.com/map/im/9-9-x8ynIiIdpNQHeA5CWg)

I would like to tag this fact. Any examples or suggestions?



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Re: [Tagging] symmetrical guardrails

2015-07-11 Thread johnw

 On Jul 12, 2015, at 4:41 AM, John Eldredge j...@jfeldredge.com wrote:
 
 Depending upon which side of the road the guardrail is on, either the left 
 side or right side may be inner. If there is a distinct inner and outer side, 
 the inner side will always be towards the traffic.
 
 
Japanese motorway barriers.

https://goo.gl/maps/7iZrg https://goo.gl/maps/7iZrg Countryside
https://goo.gl/maps/qNir5 https://goo.gl/maps/qNir5 Urban

There are some guardrails which share support poles with the one for the 
opposite road, the total set being about 50-80cm wide. 
If they used separates poles, and had any kind of a gap between them, I could 
see drawing two ways to represent both guardrails. 

Unless it is very easy to map both sides of the guardrail ( there is a gap) or 
putting two ways running in opposite directions on the same nodes, (to 
represent both guardrails), wouldn’t a “both” value of some kind (like for 
embankment) be reasonable in some instances?

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Re: [Tagging] symmetrical guardrails

2015-07-11 Thread John Eldredge
That seems reasonable. I was responding to the idea, stated in the original 
definition, that the right side of a guardrail would always be the inner 
side of the guardrail, and the left side would always be outside. In 
practice, guard rails can be present on either, or both, sides of a 
roadway, particularly if it is on a raised embankment.  The side towards 
the traffic will be the inner side. As you said, a guardrail dividing two 
ways may have two inner sides if the supports are shared.



--
John F. Eldredge -- j...@jfeldredge.com
Darkness cannot drive out darkness; only light can do that. Hate cannot 
drive out hate; only love can do that. -- Martin Luther King, Jr.




On July 11, 2015 8:13:01 PM johnw jo...@mac.com wrote:



 On Jul 12, 2015, at 4:41 AM, John Eldredge j...@jfeldredge.com wrote:

 Depending upon which side of the road the guardrail is on, either the 
left side or right side may be inner. If there is a distinct inner and 
outer side, the inner side will always be towards the traffic.



Japanese motorway barriers.

https://goo.gl/maps/7iZrg https://goo.gl/maps/7iZrg Countryside
https://goo.gl/maps/qNir5 https://goo.gl/maps/qNir5 Urban

There are some guardrails which share support poles with the one for the 
opposite road, the total set being about 50-80cm wide.
If they used separates poles, and had any kind of a gap between them, I 
could see drawing two ways to represent both guardrails.


Unless it is very easy to map both sides of the guardrail ( there is a gap) 
or putting two ways running in opposite directions on the same nodes, (to 
represent both guardrails), wouldn’t a “both” value of some kind (like for 
embankment) be reasonable in some instances?


Javbw
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