Data Consistency, Routing Capability

Posted by mannequinZOD on 28 October 2009 in English (English)

OSM lacks behind other map services with Routing capability, because a lot of nodes lack connections. Many users are not aware of these issues. Better advertisement of tools like could significantly improve map quality. Maybe it should be one of the default map layers?

Comment from Buadhai on 29 October 2009 at 00:33

Thank you very much for this. I see many errors in my own mapping. But, I'm not sure how to fix some of them. Maybe a little tutorial on how to fix common errors would be in order?

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Comment from Guillaume Audirac on 29 October 2009 at 05:04

In my opinion, the worst ones are the ways not properly connected to the whole road network, like:
- almost junctions
- intersections without junctions

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Comment from Chaos99 on 29 October 2009 at 07:24

Well most errors I encounter are missing turn restrictions. They are still a little bit harder to tag than just roads and intersections and, more importantly, you tend to not remember them when just mapping along a GPS trace.

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Comment from Ethan O'Connor on 29 October 2009 at 19:47

Another way to approach this, in addition to encouraging use of error-checking tools like, is to make sure that the tools that people use to map encourage the practices that result in good topology. Just a simple check for unconnected ways as they are created and a quick, easy to dismiss pop-up message explaining OSM topology practices in potlatch would go a long way!

I know I was confused about this at first :) Then I learned to love the 'm' and 'j' keys in JOSM :P

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