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[roads] Lingering Bridge layering problem on zoom 13 in mapnik #3816

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openstreetmap-trac opened this issue Jul 23, 2021 · 3 comments
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@openstreetmap-trac
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Reporter: rickmastfan67
[Submitted to the original trac issue database at 1.46pm, Thursday, 9th June 2011]

Back in o26009, the bridge layering problem was addressed. However, it seems that it wasn't fully fixed. It seems on layer 13 that "motorway" bridge's are rendering on-top of other bridges.

Here's an example of this:
Here on zoom 17, Townline Rd is rendered properly overtop of the QEW as it's on layer 2 and the QEW bridges are on layer 1.
http://www.openstreetmap.org/?lat=42.96323&lon=-79.02229&zoom=17&layers=M
It looks fine on all zoom levels while you zoom out until zoom 13 (the last zoom you can see tertiary bridges).
http://www.openstreetmap.org/?lat=42.96323&lon=-79.02229&zoom=13&layers=M

Is it possible that you can fix zoom 13 fully please? Thanks.

@openstreetmap-trac
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Author: rickmastfan67
[Added to the original trac issue at 1.17pm, Saturday, 11th June 2011]

Proper changeset link: r26009

(Why can't we edit our own original posts...?)

@openstreetmap-trac
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Author: Ldp
[Added to the original trac issue at 2.04pm, Saturday, 11th June 2011]

The first zoom where you can see tertiary bridges is actually z14. This means that at z13, the tertiary bridge is drawn as a regular tertiary and then the motorway bridge is rendered on top.

As it is still quite noticeable, perhaps a proper z13 tertiary bridge is in order.

@openstreetmap-trac
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Author: math1985
[Added to the original trac issue at 2.58pm, Sunday, 4th May 2014]

This has been fixed in the meanwhile.

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