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. Steve