artemp/trac2github — Issue #890: Name label is cut between two tiles
Author: artemp
Created: 2011-10-09 20:55:20+00:00
State: open
Labels: Core_Library

I experienced a strange behaviour of Mapnik with the name tag on OpenStreetMap.
Several weeks ago, I added a name tag to a building in Leverkusen (http://www.openstreetmap.org/browse/way/51174738/)
In different zoom levels, Mapnik creates a name label in different ways. Here's the OpenStreetMap link:
http://osm.org/go/0GDrkHBJ

The building is on two tiles. On zoom level 16, the name is partially rendered on one tile, the other tile contains no name.
I let rerender the tiles several times but the misbehaviour stays. I can rule out local caching, since I tested it in several networks, on several machines with several browsers and several operating systems.
Other users see the same effect. Here's a screenshot of the error:
http://imgur.com/wwWQT

I don't think that the tagging is wrong, because the name shows up in other zoom levels.

I think this is a bug in Mapnik.