Opened 6 years ago

Closed 5 years ago

Last modified 5 years ago

#4809 closed defect (worksforme)

Mapnik produces water-filled tiles at zoom=18 for big area in Siberia

Reported by: pvm96@… Owned by: mapnik-team@…
Priority: major Milestone:
Component: mapnik Version:
Keywords: water, zoom, 18 Cc:

Description

If you look at any place inside this area zoomed at level 18, you'll see that the whole area is filled with water, even where there is ground: http://www.openstreetmap.org/?box=yes&bbox=81.23549%2C54.060041%2C85.627667%2C68.841992

Some pictures of the edges of this effect are: East http://www.openstreetmap.org/?lat=55.27545&lon=85.627667&zoom=18&layers=M South http://www.openstreetmap.org/?lat=54.08514&lon=83.40566&zoom=18&layers=M West http://www.openstreetmap.org/?lat=58.858448&lon=81.23549&zoom=18&layers=M North http://www.openstreetmap.org/?lat=68.841992&lon=82.550755&zoom=18&layers=M

I've found no strange geometry at the edges of the rectangle, and the edges do not always coinside with tiles edges (see this for example: http://b.tile.openstreetmap.org/18/190225/73869.png)

The problem affects a huge 2000x200km area, I have no idea what's causing it, guys at talk@… suggested a bug report, which I'm filing now.

http://lists.openstreetmap.org/pipermail/talk/2013-March/066473.html

Change History (4)

comment:1 Changed 6 years ago by pvm96@…

There is a small discussion in talk maillist: http://lists.openstreetmap.org/pipermail/talk/2013-March/066462.html

comment:2 Changed 6 years ago by Ldp

I've seen strange effects like this in that area of the world before. It was a large pink-ish area then.

I notice it's not exactly on a tile boundary either: http://b.tile.openstreetmap.org/18/190225/80172.png

I don't know what causes it. IIRC, it resolved itself spontaneously the last time it happened, a few years back.

comment:3 Changed 5 years ago by pnorman

Resolution: worksforme
Status: newclosed

wfm - and we've switched coastline sources now, so we'd need a new area to see if there's an issue again.

comment:4 Changed 5 years ago by pvm96@…

yep, it seems to be fine now.

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