[HOT] Broken (multi)polygon cleanup

Jochen Topf jochen at remote.org
Thu Apr 27 13:36:11 UTC 2017


I just posted a new Maproulette challenge for fixing one particular case
of broken polygons: Building ways with "spikes". Details are at
http://area.jochentopf.com/fixing.html#spikes-buildings .

Because there is a large number of those in HOT areas, I have split
those off into their own challenge
Would be great to get some help fixing those from the HOT community.


On Wed, Mar 15, 2017 at 04:06:05PM +0100, Jochen Topf wrote:
> Date: Wed, 15 Mar 2017 16:06:05 +0100
> From: Jochen Topf <jochen at remote.org>
> To: hot at openstreetmap.org
> Subject: [HOT] Broken (multi)polygon cleanup
> Hi!
> There are many broken (multi)polygon geometries in OSM data leading to
> all sorts of problems. I have started an effort to get this cleaned up.
> You can read more about this at http://area.jochentopf.com/ .
> This effort has been running for about a month now and we can already see
> some good results. See https://github.com/osmlab/fixing-polygons-in-osm/issues/15
> for some news about what's been happening.
> I am writing to the HOT list today, because a not-so-small part of the
> problems come from HOT mappers. For instance, looking at one particular
> problem here (spikes in closed ways), I am seeing about 5800 errors, of
> which about 1600 are in areas covered by the HOT tasking manager. (Of
> couse not all of these have been done in the course of HOT mapping, but
> probably most of them.)
> I am reaching out to some of the regional OSM communities and also to
> HOT, because I want to a) ask for the help of all the communities in OSM
> to fix those errors and b) generally raise awareness, so those problems
> can be minimized in the future.
> Please go to the web sites linked above and read up on what the problems
> are and how we are fixing them. I also want to offer my help in
> preparing special data extracts or Maproulette challenges etc. to help
> the HOT community participate in the cleaning up effort in a way that
> makes sense to you. I could, for instance, put those 1600 errors
> mentioned above in a special Maproulette challenge, if that would be a
> good way for HOT mappers to work on them.
> Tell me what you think. I appreciate any feedback.
> 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

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