I am interested in this approach as well. Can you please post the howto for this? In our areas the sea gets broken sometimes due to newbie editing it would be good if I have a permanent sea osm file to create a onetime sea polygon. On Tue, Oct 6, 2009 at 6:08 PM, Clinton Gladstone <clinton.gladstone@googlemail.com> wrote:
On Tue, Oct 6, 2009 at 9:29 AM, Du Plessis, Bennie <Bennie.DuPlessis@sappi.com> wrote:
Like Apollinaris says: --generate-sea takes very long. And it doesn't work well with tiles, and depends on --ignore-osm-bounds which buggers intertile routing. So I compiled --generate-sea with a style with nothing but the coastline, which ran for 1.5 hr and gave me a lovely map with the land & sea seperated but nothing else. The plan is to use this in a mapset if I want to have a blue sea. Almost like an overlay, but maybe an underlay?
This is the approach I am experimenting with: I create a map with a lower draw priority which includes only coastline, and use the --generate-sea option. Since the coastline does not change very much, this map does not need to be generated very often. Also, since the map is not relevant for routing, and is much smaller than normal maps, it does not necessarily need to be split.
Of course, the other maps need to be transparent for this to work.
I've tried this out with a map of Ontario Canada, and it seems to work quite well, with the exception of the usual generate-sea problems (some flooded islands, etc.). I've tested it on a Nuvi and an eTrex.
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