[OSM-talk] Key:layer update

Dave F. davefox at madasafish.com
Tue Mar 11 14:20:58 UTC 2014

Could you give some visual examples, maybe temporarily creating them in 
OSM (& deleting them afterwards) to clarify what you mean?

Dave F.

On 09/03/2014 22:26, Matthijs Melissen wrote:
> On 9 March 2014 10:30, Richard Z. <ricoz.osm at gmail.com> wrote:
>> for some time now I have been working on the wiki page to state the rules
>> as clearly as possible.. hope that most of the improvements are fairly
>> uncontroversial.
> Thank you for doing this, it's very useful to have this properly
> documented. I have been working on layering in the main CartoCSS
> stylesheet, and found that at the moment, indeed not all aspects of
> the layering model are defined precise enough.
> A question: a single road can contain sections on multiple layers, so
> there will be a point where the sections that are on different layers
> meet. At that point, there might even be a side street. However, no
> vertical ordering should be assumed at such a point. It is written
> that "The vertical ordering established by the layer values is valid
> exactly only in the point where the ways cross or objects overlap."
> Perhaps 'crossing' should be interpreted here as crossing without
> node, but that causes problems with bridge/waterway.
> In other words, I am wondering for each of the following situations if
> the roads should be interpreted as meeting on the same or different
> levels:
> - A node where two waterways on layer 1 and two roads on layer 2 meet;
> - A node where two roads on layer 1 and two roads on layer 2 meet;
> - A node where two roads on layer 1 and one road on layer 2 meet;
> - A node where one road on layer 1 and one road on layer 2 meet.
> Perhaps some text that answers questions like this should be added to
> the Wiki-page.
> -- Matthijs
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