Hi WanMil and others,
Some time ago, there was discussion that the MultiPolygon code in
mkgmap should tag the lines that it generates when splitting
multipolygons to polygons.
I think that there is a genuine need to split large multipolygons to
smaller multipolygons in the OSM data too. For example, I generated
multipolygons for the lake Saimaa in the past couple of weeks. I split
it to maybe 10 or 20 multipolygons, some of them still huge (hundreds
of ways in the relation, many of them consisting of 500 nodes).
A fellow mapper who generated the natural=coastline for many Finnish
waters in the first place got upset of the artificial splitting. I
suggested a solution where the artificial split lines would not be
given any natural=water or natural=coastline tag, but something else,
say, artificial=yes.
What do you think? Is there an existing tag that we could use for this?
Is there now a multipolygon around the Canarian Islands? I could not
find one. I am considering defining some multipolygons with some
artificial cut lines on the Finnish coast, so that I would get water
without --generate-sea and could work around the limitations of the
Geofabrik map extracts by defining the borders of the sea multipolygons
within the Geofabrik cutting boundary.
Marko
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