Steve,

> Oh OK, I've attached a picture of the worst bit - that is expected then?

Hmm, that's particularly bad, attached is what I get when using
multipolygon (and my h v patch). As you can see, not bad at all.
Zooming in and out doesn't make it change very much.
 
> I took another look at the NZ maps on your suggestion and there are 
> indeed a few artefacts there which look similar.  Interesting.  If there 
> is no obvious reason, then reducing the number of sea polygons would be 
> a good idea I suppose.

Perhaps, but when there is a lot of islands, you are always going to
get a lot of sea polygons. That is one definite advantage of using
generate-sea=polygons because then you only get one polygon per island
and one sea polygon per-tile (obviously, these may be split if they are
large).

Mark

<<attachment: island-artifacts.png>>

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