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[mkgmap-dev] missing coastline polygon lately

From maning sambale emmanuel.sambale at gmail.com on Wed Sep 8 07:28:54 BST 2010

Dear Marko,

Thanks for the reply.

> Educated guess: previous errors canceled out each other (the errors must
> have been visible in a smaller area).
> Unless your map extract is a perfect island, you may have to move the
> coastline endpoints to make mkgmap happy.
I think it is, the Philippines is an island/archipelagic country:


> coastline generation for Finland, I both adjusted the Geofabrik cutting
> polygon (it took a few iterations with Frederik Ramm) and moved the
> endpoints of the mainland coastline to the tile boundaries (so that the
Do you mean using splitter?  I am not using splitter at the moment
since the data is small enough as one img.

> last bit of coastline is a straight N-S or W-E line). I played with the
> idea of merging real coastline of neighbour countries to the map, but
> that did not work out, and it would have been less obvious to see where
> the mapped territory ends.
> Moving the coastline endpoints can be done with a trivial Perl or sed
> script. See my osm2img.sh at http://www.polkupyoraily.net/osm/ for an
> example. To find the endpoints of your map extract, you can extract the
> natural=coastline ways from your map extract and load that to JOSM.
>        Marko
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