[Tilesathome] New close-coastline trouble tile

[spaetz]

I rendered lowzoom tile (xy 136 77 8) which is Göteborg. The coastline download is a 15MB osm file downloaded via the zappy API (I have it saved if somebody needs it). Close-coastlines renders a blue rectangle over the whole z8 tile, so that Göteborg is completely underwater now.

The coastline is a hellish thing. I couldn't find a way to see whether it's all ok or and there's some closed-coastline bug or whether it contains a hole somewhere.

Is there a josm plugin to check whether coastline is uninterrupted? Does anybody have any tools or ideas to check that area?

Thanks in advance,
spaetz