[OSM-talk] Mapnik rendering issue with *_link roads

[Richard Mann]

Logically, you need to know the lower of the two classifications being
linked, and it may also be useful to know the higher of the two being
linked. So I record that information in links_lower and links_higher tags.
Then it can be rendered very neatly.

But I got flamed last time I proposed this ought to be fixed, so this
information is offered on a tag-what-you-like basis, rather than a
render-as-I-do basis.

Richard

On Fri, May 4, 2012 at 1:09 PM, Maarten Deen <mdeen at xs4all.nl> wrote:

> I finally found out what the issue is with this [1] situation. My issue
> with it is that IMHO it is not good to see the unclassified road rendered
> on top of the primary_link road. I made a test here [2] where the left
> primary is a primary_link and the right primary is a primary proper.
> Apparently mapnik's renderering rules state that primary_link roads should
> be rendered below unclassified roads. I haven't inspected the rendering
> rules in detail (I'm also not familiar with them) but I have seen that
> tertiary_link roads are also rendered below unclassified roads. I expect
> that any *_link road is rendered below any other (or at least motorway -
> unclassified) road.
>
> Is this behaviour of mapnik wanted? As I said: IMHO it is not pleasing to
> the eye to see the unclassified road rendered on top of the primary_link
> road. In order of priority, a *_link road is just below its * counterpart
> but above the next lower road (so primary -> primary_link -> secondary).
>
> [1] http://www.openstreetmap.org/?**lat=51.352555&lon=6.014996&**zoom=18<http://www.openstreetmap.org/?lat=51.352555&lon=6.014996&zoom=18>
> [2] http://www.openstreetmap.org/?**lat=51.352419&lon=6.010627&**zoom=18<http://www.openstreetmap.org/?lat=51.352419&lon=6.010627&zoom=18>
>
> Regards,
> Maarten
>
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