[Tagging] Another multipolygon question
61sundowner at gmail.com
Sun Oct 21 01:40:45 UTC 2018
On 21/10/18 12:24, Kevin Kenny 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.)
An area of sand I introduced .. between a natural coastline, a tree area
and a water area... Relation: 8718211. Using JOSM.
Yes the coastline was already a relation, as was the tree area.. I don't
remember what the water areas was.. probably a relation too.
Most, if not all, the coastlines I deal with are relations.
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