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[mkgmap-dev] (Fixed by workround) Bizarre flooding in South Wales

From Steve Hosgood steve at stoneship.org.uk on Thu Oct 13 14:46:35 BST 2011

On 2011-10-13 14:07, Bartosz Fabianowski wrote:
> Following the coastline to check whether it enters the current tile 
> again will work in Great Britain but may fail in continental Europe. 
> The Geofabrik Europe extract does not have a closed coastline after 
> all. That would have to go all around Asia and back.

That's right!

What, you mean it doesn't go round Asia?? :-(

Notice that once you've done the miserable tour of Asia once, then it's 
OK to split the resulting "Europe" tile to get a tile for just "Poland" 
(say) because the coastline to the east of Europe's area (i.e. around 
Asia) would by now have simplified to just a couple of straight 
(invisible, out-of-bounds) lines.

> So yes, following the coastline out of the tile somehow is a good 
> idea. But no, it is not as simple as following it until it enters the 
> tile again :(.
> - Bartosz

Hmm - I don't know about that. Maybe with the data the way it is now, 
but I argue that we've got the data wrong if so.


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