[HOT] Broken (multi)polygon cleanup

Blake Girardot HOT/OSM blake.girardot at hotosm.org
Wed Mar 15 16:29:04 UTC 2017

Hi Jochen,

Thank you very much for writing to the HOT list!

I think you will find a lot of enthusiasm for helping get these fixed
as well as improving our training and instructions to make sure we
minimize new mappers who come to OSM through HOT and Missing Maps
making these errors going forward.

Can you send me something that would help me see those 1600 examples
you found on OSM so I can see what might be going on and how to
improve things in HOT/MM workflow to reduce them?


On Wed, Mar 15, 2017 at 4:06 PM, Jochen Topf <jochen at remote.org> wrote:
> 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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Blake Girardot
Humanitarian OpenStreetMap Team, TM3 Project Manager
skype: jblakegirardot
HOT Core Team Contact: info at hotosm.org
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