Hi List, I'm working on the oceantiles for three weeks now changing over 2200 tile definitions and am getting more and more frustrated. The decision about whether a tile is sea/land/mixed is sometimes very hard and often vague. I've seen cases where the coastline is about 0.5 meters away or within a tile. So the next time somebody is moving a single node there may harm the tile rendering.
I've also seen cases where the rendering of a tile depends on the state of a neighbor tile. Very strange! And the situation at the pole areas is even more frustrating. I assume, that there are still thousands of tiles to be fixed especially in Canada and Russia. But also in Indonesia is still a lot of work to do. I was thinking a lot about this and already dreamed of it... I cannot see the necessarity for a 'mixed' state. The oceantiles.dat should give the server the possibility to serve a colored image where no tile information is present and the renderer should only upload an empty tile if it really cannot decide whether there is land or sea. The renderer should only take the state of the tile as background color if there is no coastline or water or land in the rendered OSM data. Wherever the renderer is able to decide this on basis of the OSM data it should do so where the oceantiles.dat is not necessary for, is it? If there is a coastline or water or land, then the renderer should now, where there is land and where sea. That would make the definition of the oceantiles much more easy and flexible. The tile could be defined as 'sea' even if there is a node of the coastline whithin that tile. And the movement of a coastline by a few meters due to a storm or a tsunami would not force the oceantiles.dat to be changed. The download of a bigger area by the renderer would also no longer be necessary, I think. Only probably slightly bigger for bezier curves where no node of that line is whithin the rendered tile. This would reduce the load of the OSM servers. Furthermore, it would probably be useful if there are more states for the oceantiles.dat in case of big areas of wood (national park, rain forrests, etc.) and other areas I currently don't think of... Opinions? Regards, Andre
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