[Tagging] Another multipolygon question

Kevin Kenny kevin.b.kenny at gmail.com
Fri Oct 26 15:06:27 UTC 2018


>
> 26. Oct 2018 11:52 by daveswarthout at gmail.com:
>
> Thanks, That helps a lot. I don't work with routes (yet) but it when I'm
> adding inners to riverbank multipolygons I always add them in the order
> they would appear if you were traveling downstream. It just makes sense to
> me although there's probably no programmatic reason to do it.
>
> On Fri, Oct 26, 2018 at 5:55 AM Mateusz Konieczny <matkoniecz at tutanota.com>
wrote:
> Order of elements is saved in OSM database.

That appears to be the answer to a different question.

The 'sort' operation in the JOSM relation editor changes the order of the
elements. If the layer is uploaded, the new order of elements, as produced
by the 'sort' operation, will replace the old order in the OSM database.

This is usually what I want with a multipolygon. With a route, I find
myself undoing or further altering a 'sort' operation much more often,
because there are often things about routes that JOSM doesn't get quite
right. (Example - a dual carriageway where both ways end in link elements
looks as if the route has floating endpoints, and the sort operation messes
up one of the directions.) Even there, though, the 'sort' is usually Pretty
Close to right, and is often usable as a starting point. Moreover, I'm not
sure that it can be improved. The topology of a route isn't always quite
right in the field, and some of 'getting it better' amount to 'read the
mapper's mind,' something computers are ordinarily not well equipped to do.
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