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

[Jochen Topf]

On Sun, Mar 19, 2017 at 02:46:30PM +0100, Jochen Topf wrote:
> 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

That challenge has been done for a while. But there is much more to do.
The problems include self-intersections, overlapping areas, and other
problems, mostly on forest and other landuse polygons. The problems are
too dense to fix using Maproulette. See here on how to fix this...

http://area.jochentopf.com/fixing.html#fixing-multipolygons-in-south-korea

Would be great if some people on this list want to take this on!

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

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

[Andrew Errington]

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"  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"  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=128.02487=36.21680=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  joc...@remote.org  https://www.jochentopf.com/
+49-351-31778688

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Re: [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"  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=128.02487=36.21680=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  joc...@remote.org  https://www.jochentopf.com/
+49-351-31778688

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