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#1 2021-05-16 19:07:21

mdelatorre
Member
From: (19.193658, -100.131631)
Registered: 2009-01-11
Posts: 56
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Check for two or more multipolygons sharing the same outer way

Hi,

JOSM validator is marking as an error when two multipolygons neighbors are side to side. ex. I have a forest multipolygon  (role=outer) next to a grass multipolygon  (role=outer). They share one side of each's outer polygon.

Is this a mistake? You cannot have different multipolygons sharing the same outer way position?

Manuel.


Mdelatorre - OpenStreetMap Foundation Member
Bad Elf RTK GNSS Surveyor | Garmin Nüvi 850

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#2 2021-05-16 20:58:30

n76
Member
Registered: 2013-05-22
Posts: 289

Re: Check for two or more multipolygons sharing the same outer way

I don't know if it is actually considered a mistake but I know that I find making changes in places where multiple lines or polygons share the same nodes makes things more difficult.

What I prefer to do in cases like this where two land cover polygons touch one another is to make them into multi-polygons and then have the boundary between the two a separate way that is included in both multi-polygons.

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#3 2021-05-16 21:34:44

GerdP
Member
Registered: 2015-12-18
Posts: 1,468

Re: Check for two or more multipolygons sharing the same outer way

mdelatorre wrote:

JOSM validator is marking as an error when two multipolygons neighbors are side to side

What error message do you get?

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#4 2021-05-19 07:22:49

Maarten Deen
Member
Registered: 2010-05-20
Posts: 458

Re: Check for two or more multipolygons sharing the same outer way

It is not an error for multipolygons to share ways, but it can be that there are other errors. Which multipolygons give the error?

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