Mapnik rendering of this one forest is light grey instead of green

Posted by Barthwo on 24 August 2010 in English (English)

Look at:
compared to the rendering at a bigger scale:

In the more detailed scales THIS ONE (big) wood area is rendered in a light grey whilst all other woods are green !!

This was not always the case. Happened shortly. Don't know the exact day.

Does anyone have any idea what's wrong there?


Comment from Kevin Steinhardt on 24 August 2010 at 11:39

That is odd. The wood=mixed tag might be playing with Mapnik; I think certain wood=* values will render little tree pictograms on a green woodland colour: like on OS maps, where pine forests have little pine symbols, and deciduous woodland has a tiled round-esque tree symbol. Not too sure; I would consult the Mapnik team on this problem.

Comment from Sanderd17 on 24 August 2010 at 13:01

If you zoom in deep enough, you can see some tiles are rendered green, other are grey. I would like to see the history of the forest but it seems too large for the server (50+ versions and a lot of nodes). I get a server timeout.

Before you investigate further, try to re-render the tiles.

Comment from Sanderd17 on 24 August 2010 at 13:07

sorry, re-rendering makes it grey. But I do would like to see the history. Does anyone have a solution to get the history without server timeout. I don't need all the versions and I don't need the nodes, I simply need the tags.

Maybe the forest isn't closed anymore, that would render it grey.

Comment from Barthwo on 24 August 2010 at 13:45

That may be the solution. Someone edited this large area and it wasn't closed whe he finished.

Anyone any idea how to find the "loose ends"?

Comment from Barthwo on 24 August 2010 at 14:26

I found a "inner polygon" of this mulitpolygon which wasn't "inner" in my opinion. So I deleted it and hopefully it will render correctly now.

Comment from gomatteo on 24 August 2010 at 20:07

Perhaps I fixed it... The outer way of the multipolygon had 3 self-intersected ways, I spotted them with the josm validator plugin.
If you want you can get the history of the relation in xml format, point your browser at

Comment from Barthwo on 24 August 2010 at 21:47

Thanks guys. Seems to be fixed. Rendering looks good now.

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