[mkgmap-dev] Coastline issues - analysis and possible solution

Mon Aug 29 08:08:26 BST 2011

> It still takes a little tweaking to get the coastlines right. I have
> manually chosen the tile borders so that the coastline will end outside
> the tile border. Only in the Swedish/Finnish border I am using
> extend-sea-sectors to make up some coastline in Sweden.

This is why I collected the coastlines for all of Europe in a single 
file. When all European coastlines are available, you no longer have to 
tweak tile boundaries.

> I think that it could be useful to have the tile-splitter support a set
> of fixed tiles that it would split itself further as needed.

I presume you would then use this so that you extract a larger region 
and then let the splitter generate tiles for a subset of this region? 
With a sufficient margin of safety between the two regions, this should 
work by providing the splitter with coastline data even when tiles grow 
due to rounding.

- Bartosz