[Talk-ko] Broken (multi)polygons in Korea

[Andrew Errington]

As far as I know there has been no import of forest area data.  There is a
prolific mapper who has made rough outlines of forested areas.  Some of
these areas overlap with others.  Some areas intersect with themselves.  I
don't think each area represents anything "on the ground", just a
convenient chunk to draw a line around.

I will contact that mapper and ask about his or her methodology.  There are
other "large area mappers" too.

Best wishes,

Andrew

On Mar 15, 2017 4:58 PM, "Jochen Topf" <jochen at remote.org> wrote:

Hi!

there are quite a lot of broken (multi)polygons in the OSM data. I have
started an effort to clean them up. You can find out more at
http://area.jochentopf.com

I found that there are many problems with self-intersections in South
Korea, often on forests. You can see this here:
http://tools.geofabrik.de/osmi/?view=areas&lon=128.02487&lat=36.21680&zoom=8

Was there some kind of import? Can you, the Korean community, help with
fixing them? How good is that forest data anyway? Is it worth cleaning
up? I'd appreciate any information and help.

If you are interested, I can also create special Maproulette challenges
or create special data extracts or so to help the Korean community clean
this up?

Jochen
--
Jochen Topf  jochen at remote.org  https://www.jochentopf.com/
+49-351-31778688

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