[Tagging] Carriageway divider

Markus Lindholm markus.lindholm at gmail.com
Sun Aug 19 19:26:15 BST 2012


On 19 August 2012 18:23, Tobias Knerr <osm at tobias-knerr.de> wrote:
> On 19.08.2012 15:09, Markus Lindholm wrote:
>> On 19 August 2012 14:49, Fabrizio Carrai <fabrizio.carrai at gmail.com> wrote:
>>> This could be a solution but it is against the reality: this kind of road
>>> are indeed a single entity. The "legal" division, i.e. the "solid_line" is
>>> just an attribute.
>>
>> There's a multitude of cases where a single entity is represented by
>> multiple objects in the database, e.g. when the road changes speed
>> limit it has to be split into two highway objects. The same with bus
>> routes, to accommodate then the road was to be split into many parts.
>
> A major difference is that it is comparatively easy to re-assemble a way
> that has been split (because they have common nodes).
>
> It's not so easy with two parallel ways that somehow "belong together" -
> the connection could only be established by rather complex heuristics
> based on proximity among other things. In practice, it would simply
> result in gaps or overlaps appearing randomly depending how "parallel"
> the mapper has actually drawn the ways, and on the width assumed (or
> tagged) for the ways.

For which purpose would the two highways be "reassembled"?

/Markus



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