[Tagging] Another multipolygon question

bkil bkil.hu+Aq at gmail.com
Sun Oct 21 11:33:08 UTC 2018

It seems many would find a short video tutorial depicting these steps very
handy. Would you mind sharing on Bitchute or on some other video hosting

On Sun, Oct 21, 2018 at 3:26 AM Kevin Kenny <kevin.b.kenny at gmail.com> wrote:

> Works great, right up until you need to maintain it.  So, you've got
>> your "natural=wood" multipolygon sharing a way with an adjoining
>> "natural=scrub".  And then, some inconsiderate developer bulldozes his
>> way across the boundary and puts up a housing development.  Now what do
>> you do?  You can't unglue the boundary and shrink the two affected
>> areas to make room for the "landuse=residential" because there's only
>> one way.
>> The only option I've found is to remove the affected section of
>> boundary from one of the multipolygons, move it to the new location,
>> create a new boundary way for the other multipolygon in the proper
>> place and add it, create a new multipolygon for the development and add
>> the relevant boundary ways to it, and then confirm that you haven't
>> broken any of the multipolygons involved.  It's painful enough that
>> it's usually faster and easier just to delete everything and re-create
>> them from scratch as ordinary closed ways.
> I actually do edit those things pretty routinely. It involves redrawing
> only for the added ways.
> Draw the new closed polygon representing the landuse=residential. Make it
> a multipolygon immediately.
> Insert nodes at the intersections of this closed way with the existing
> ways (if you didn't draw it that way to start with). Split the old and new
> ways on the nodes. (Splitting is safe - they're multipolygons already.)
> JOSM has an 'add nodes at intersections' feature that helps with this.
> Edit each of the old multipolygons to replace their old boundaries with
> the new ones. That's just 'remove the old ways, insert the new ones' in the
> relation editor.
> Finally, delete any ways that are now unused.
> I can do this *lots* faster than I can redraw an irregular boundary, at
> least in JOSM. (I'm not skilled enough with iD to comment. it wasn't much
> harder in Meerkartor when I tried it.)
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