[Imports] Help us address issues with the NYC Import

Alex Barth alex at mapbox.com
Mon Oct 14 21:54:33 UTC 2013


Ok, here's what I think we should do:

1. Join T intersections in conversion (Matt and I are on this)
https://github.com/osmlab/nycbuildings/issues/8
2. Set up a QA script reporting common mistakes (start here
https://github.com/osmlab/nycbuildings/issues/18)
3. Write up nice blog post highlighting some of the mistakes, send out to
existing importers
4. Reach out personally to repeat "offenders"
5. Not grow number of individuals involved until we increase quality.



On Mon, Oct 14, 2013 at 4:59 PM, Pieren <pieren3 at gmail.com> wrote:

> On Mon, Oct 14, 2013 at 9:51 PM, Serge Wroclawski <emacsen at gmail.com>
> wrote:
>
> > Yet, despite all this instruction, we had a lot of errors in the data,
> > even from extremely experienced mappers.
> > We could really use your help in coming up with solutions to these
> problems!
>
> We have the same issues in the French building imports since ... 2010
> (it's a long-running country-wide import). What you can do is
> - you only allow the import to certified contributors ... or:
> - provide the best original data. If you can, fix the geometric errors
> automatically (duplicate nodes, missing intersecting nodes and
> overlaps). Conflation is a bit more complicate (too many cases) and
> should remain manual.
> - contact people and explain them again where they do mistakes and how
> to proceed (or point again to your tutorials)
> - create a QA tool reporting the errors you mention then let the
> community fix them. In France, we developed a QA tool called osmose
> reporting duplicate nodes, highways crossing buildings (item 1070),
> buildings overlapping (item 0) etc ([1]). If errors are increasing,
> create taskforces around a specific error or area.
>
> Pieren
>
> [1] http://wiki.openstreetmap.org/wiki/Osmose
> [2] http://wiki.openstreetmap.org/wiki/Osmose/errors
> [3 http://osmose.openstreetmap.fr/en/map/
>
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