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[mkgmap-dev] [PATCH v1] Precompiled sea

From WanMil wmgcnfg at web.de on Mon Apr 30 22:04:30 BST 2012

> On Apr 29, 2012, at 22:07, WanMil wrote:
>> attached patch uses precompiled sea files to generate the sea areas.
> Hi WanMil,
> Thanks for doing this. This seems like a quite promising approach. I'll try to test it in the next few days.
> Coincidentally, I noticed a blog entry from Joachim Topf, where he describes work on his OSMCoastline code, which extracts coastline data and renders sea polygons:
> http://blog.jochentopf.com/2012-03-07-osm-coastlines.html
> I don't know if any of this is relevant, especially if you are now using the precompiled Mapnik sea areas.

It is! Jochens blog gave me the idea to use sea information from another 
source (don't reinvent the wheel :-). I tried but didn't succeed to run 
Jochens new program. But it would be very good to use his new approach. 
The precompiled mapnik sea files have a big disadvantage: the land areas 
overlap and this has to be removed by the mkgmap precompiler. This is 
very expensive and requires a long time (maybe some optimizations are 
possible for that...)


> Cheers.
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