On Wed, Mar 31, 2010 at 12:30 AM, Marko Mäkelä
<marko.makela@iki.fi> wrote:
On Tue, Mar 30, 2010 at 11:08:40PM -0800, NopMap wrote:
> - What level of confidence do you achieve with generate sea? Many posts
> still mention minor failures, disappearing islands etc.
As far as I am concerned, it just works. Any errors will be logged and will
come through my error message filter. You can fetch my scripts and files at
http://www.polkupyoraily.net/osm/ and adapt to your area.
can confirm that. now also --generate-sea=multipolygon works and didn't have any failures on whole california which has some real complex coastlines. don't remember the exact mkgmap version. any newer one will do.
I like it more this way because I don't need to have a typ file
Also, when debugging coastline errors (gap in coastline, coastline not
extending to map border), you may want to use a command like this:
osmosis --rx finland.osm.bz2 --tf accept-ways natural=coastline --used-node \
--wx finland-coastline.osm
xapi is your friend and can achieve the same without downloading the planet or excerpts
The resulting file should be so small that you can load it in JOSM
to see the way and node ids of the broken coastlines.
> - Is it possible to save the resulting sea/land polygons for later re-use?
> Apparently the OSM data changes more frequently than the actual coastline
> and re-generating it from scratch every time you update is not necessary.
Generating the coastline is not that slow any more. If you absolutely wanted,
I guess you could generate a separate map layer with just the sea, and compile
your regular map without --generate-sea.
Marko