[Tagging] How to solve the problem with relation overload?

Jaakko Helleranta.com jaakko at helleranta.com
Fri Nov 30 15:05:52 GMT 2012

This was exactly what I was about to comment.
I'd add that things might look relatively ok in areas where the map data is pretty complete -- but it totally tanks in areas where it's not. I didn't come to think of the access-/practicability-related, which make it even more complicated.

As per the notion of "intersection nodes are quite stable in OSM".
Again, might b true for intersection nodes but it's the additions of "shortcuts" that makes it especially complicated, I think.


------Original Message------
From: Henning Scholland
To: Tag discussion, strategy and related tools
ReplyTo: Tag discussion, strategy and related tools
Subject: Re: [Tagging] How to solve the problem with relation overload?
Sent: Nov 30, 2012 09:31

Am 30.11.2012 15:11, schrieb Pieren:
> On Fri, Nov 30, 2012 at 2:21 PM, Henning Scholland <osm at aighes.de> wrote:
>> Eg.:
>>      ___D___
>>     /       \
>>     |       |
>> ---A---C---B----
Think about there is only -A-D-B- , where A and B are a node in such a 
relation. Everything is fine.
Now someone adds a way A-C-B. This mapper have to do several things now: 
Check, if he make a way of a relation more directer as it was before.
Problem1: Find all affected relation.
Problem2: If he adds a footway, he can skip bus-relations, but what to 
do if access is unclear?
Problem3: Editing the route will end in a try'n'error: Does josm 
"routes" correct if I add this node?
Problem4: No mapper will know about to do these checks, because it was 
never ever a problem adding a simple way or changing highway=* or access

Same if a mapper changes the access of any way. Maybe its easy in 
Cities, if necessary nodes are pretty close. But in rural areas it could 
happen that you edit/add a way somewhere and you destroy a relation 
which has one node 1km left of your mappnig area and the next one 5km in 
the right. This isn't really practicable.


Tagging mailing list
Tagging at openstreetmap.org

Sent from my BlackBerry® device from Digicel
Mobile: +509-37-26 91 54, Skype/GoogleTalk: jhelleranta

More information about the Tagging mailing list