[Tagging] What is and what isn't a valid type=multipolygon relation for osm ?
hermanns at ptt.uni-due.de
Thu Oct 18 12:25:46 GMT 2012
Am 13.10.2012 20:02, schrieb Martin Koppenhoefer:
> * "Exactly two unclosed ways belonging to a role, and no more should
> share an endpoint (eg. the most extreme nodes of a way represented by
> the black dot in the images). If an endpoint is shared by less than
> two unclosed ways, the polygon can't be closed and is ill formed.
> invalid example 1 If an endpoint is shared by more than two unclosed
> ways, it's ill formed and a closed polygon can't be reconstructed
> unambiguously. invalid example 2"
Since the "Valid Multipolygon conditions" section is at the top of the
page, new mappers are reading this first. And if you don't give examples
about what that means (or at least provide appropriate links), many will
stop reading here, bercause they simply can't follow.
I'm in OSM for over a year now and I still shy away from anything
containing multipolygons because I'm not sure I understand them
correctly. So, in my opinion there can't be too many examples (both for
correct and incorrect use of multipolygons).
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