Purple overlay in some places at zoom 17 #2234
Comments
Author: yohanson Sorry for the ugly ticket, did not find how to modify it. |
Author: Ldp I've seen this issue before. Have you already submitted a ticket a while ago? |
Author: yohanson No, this is my first ticket. But I did create a forum topic, where no one answered: http://forum.openstreetmap.org/viewtopic.php?id=4042 |
Author: Ldp I think I must have seen it on the forum, then. I didn't know then, and still don't know at the moment, what causes it. |
Author: yohanson It started to disappear! :) |
Author: Ldp We've switched over to the new tile server, yevaud, which is batch rerendering many old tiles. Let's hope it doesn't return. |
Author: Ldp I had a few tiles that were still purple rerendered, and that cleared it up for those. Still don't know what caused it. |
Author: jburgess777[at]googlemail.com I am afraid this does still occur, e.g http://b.tile.openstreetmap.org/17/98256/36295.png I dug through the postgis queries for rendering that tile and it seems that the admin layer is the one which renders the bad data. There are two objects which both seem to cause an issue: way 28188776 & relation 60189. Both of these two objects cover a very large geographic area. There was a crash once before in Mapnik when trying to render such large objects at a very small scale. The problem occurred when the scaled co-ordinates of the feature became so large that the pixel dimensions relative to the tile exceed 4 billion and overflowed the 32 bit arithmetic. See http://trac.mapnik.org/ticket/253 for details. I suspect we are seeing a similar overflow here. |
Author: Ldp Hopefully fixed in mapnik2, which is what we currently use. Reopen if this still occurs somewhere. |
Reporter: yohanson
[Submitted to the original trac issue database at 7.01am, Friday, 28th August 2009]
Mapnik at zoom level 17 looks like purple color is over the map.
Zoom 16: [http://www.openstreetmap.org/?lat=54.97746&lon=82.89614&zoom=16&layers=B000FTF lat=54.97746,lon=82.89614] [[BR]]
[[Image(zoom16.png)]]
Zoom 17: [http://www.openstreetmap.org/?lat=54.97684&lon=82.8962&zoom=17&layers=B000FTF lat=54.97684,lon=82.8962] [[BR]]
[[Image(zoom17.png)]]
Whole my city looks like this at zoom 17.
I moved around the map and have found borders of the color fill. Links to it's corners:
[http://www.openstreetmap.org/?lat=62.12446&lon=89.36298&zoom=17&layers=B000FTF lat=62.12446,lon=89.36298] - intersection [[BR]]
[http://www.openstreetmap.org/?lat=62.33939&lon=89.49488&zoom=17&layers=B000FTF lat=62.33939,lon=89.49488] - intersection [[BR]]
[http://www.openstreetmap.org/?lat=54.41899&lon=89.36284&zoom=17&layers=B000FTF lat=54.41899,lon=89.36284] [[BR]]
[http://www.openstreetmap.org/?lat=62.33935&lon=89.36313&zoom=17&layers=B000FTF lat=62.33935,lon=89.36313] [[BR]]
[http://www.openstreetmap.org/?lat=62.55298&lon=89.86818&zoom=17&layers=B000FTF lat=62.55298,lon=89.86818] [[BR]]
[http://www.openstreetmap.org/?lat=62.12428&lon=78.20105&zoom=17&layers=B000FTF lat=62.12428,lon=78.20105] [[BR]]
[http://www.openstreetmap.org/?lat=62.12455&lon=89.49456&zoom=17&layers=B000FTF lat=62.12455,lon=89.49456] [[BR]]
[http://www.openstreetmap.org/?lat=62.33954&lon=89.8682&zoom=17&layers=B000FTF lat=62.33954,lon=89.8682] [[BR]]
[http://www.openstreetmap.org/?lat=62.553&lon=89.4949&zoom=17&layers=B000FTF lat=62.553,lon=89.4949] [[BR]]
[http://www.openstreetmap.org/?lat=54.419&lon=78.201&zoom=17&layers=B000FTF lat=54.419,lon=78.201] [[BR]]
In JOSM i created nodes at these coordinates and got this:
[[Image(http://id.piccy.info.nyud.net/i4/d2/16/a05b2b1ba5e659506a14787349d5.png, 120px)]]
Three rectangles, one large and two small.
What is it? I want it to disappear.
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