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Strangly rendered bridges at lowzoom #1018

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openstreetmap-trac opened this issue Jul 23, 2021 · 4 comments
Closed

Strangly rendered bridges at lowzoom #1018

openstreetmap-trac opened this issue Jul 23, 2021 · 4 comments

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@openstreetmap-trac
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Reporter: Astrofreak85
[Submitted to the original trac issue database at 10.57am, Wednesday, 9th July 2008]

You can see the problem here for example:
http://www.informationfreeway.org/?lat=51.17003021111493&lon=13.837901379145942
or here:
http://www.informationfreeway.org/?lat=51.13685367802098&lon=13.684049903374985

Is this render bug, or is there something tagged wrong?
In mapnik it seems to be OK.

@openstreetmap-trac
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Author: stoecker
[Added to the original trac issue at 1.38pm, Wednesday, 9th July 2008]

Isn't that a topic for maplint?

@openstreetmap-trac
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Author: Astrofreak85
[Added to the original trac issue at 5.35pm, Wednesday, 9th July 2008]

I think I have an idea why this happens:

A bridge is at a higer layer than the rest of the way, and it semms to me, that a bridge has a small black line at the end, and becaus of it's at another layer, also the thin black lin is rendered.

When ther is a bridge over an other street, the bridge has a fixed lenght, so when you zoom out, the street (wich is crossed by the bridge) get wider, after so zoomsteps the street is wider then the bridge above is long.

I don't now, how the guys on mapnik get rid of this, but there it doesn't seem to be like in osmarender.

@openstreetmap-trac
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Author: osm[at]petschge.de
[Added to the original trac issue at 5.43pm, Sunday, 28th December 2008]

I guess we have to move the start/end of way tagged as bridge=yes along the way going over the bridge until the nodes are outside the (exaggeratedly wide) way passing under the bridge. Not easy to get right in all instances.

@openstreetmap-trac
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Author: spaetz
[Added to the original trac issue at 12.27pm, Wednesday, 30th June 2010]

The bridges in the example above look all fine to me now. Thanks for reporting this and do reopen if this issue is not fixed yet.

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