On Mon, Aug 29, 2011 at 08:07:04AM +0200, michael lohr wrote:
>My feeling with the problem of flooded tiles always was that the
>geofabrik extracts are to blame - they're too "tight" in some places,
>so the coastline breaks in the extraction process already, not during
>the splitting. That happens for instance in the northwest of germany
>around emden and in the northwest of india in gujarat.
The Geofabrik cutting polycons are not set in stone. A long time ago, I
took a couple of iterations with Frederik Ramm to get a good extract of
Finland that would include all of the country border, plus some lake
multipolygons in the neighbour countries. I did this in Osmosis and JOSM
by extracting the country borders from the Geofabrik extract and by
downloading some data in JOSM, and finally editing the cutting polygon
in a separate JOSM layer.
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.
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.
Best regards,
Marko
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