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

[Jochen Topf]

Thanks, Andrew!

in my newest batch of Maproulette challenges, I have included a special
challenge for Korea, because there were so many problems there.

I encourage everbody to help:
http://area.jochentopf.com/fixing.html#duplicate-segments-in-closed-ways

Jochen

On Sun, Mar 19, 2017 at 10:02:57PM +0900, Andrew Errington wrote:
> Date: Sun, 19 Mar 2017 22:02:57 +0900
> From: Andrew Errington <erringtona at gmail.com>
> To: OpenStreetMap Korea <talk-ko at openstreetmap.org>
> Subject: Re: [Talk-ko] Broken (multi)polygons in Korea
> 
> Ok.  I contacted who I thought was the most prolific mapper of forest
> outlines.  They said they did it as quickly as possible because it was
> important for Koreans to see forested areas on the map.  Now they are
> reviewing and improving those polygons.
> 
> Best wishes,
> 
> Andrew
> 
> On Mar 15, 2017 5:24 PM, "Andrew Errington" <erringtona at gmail.com> wrote:
> 
> 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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-- 
Jochen Topf  jochen at remote.org  https://www.jochentopf.com/  +49-351-31778688