[Tagging] Another multipolygon question

Kevin Kenny kevin.b.kenny at gmail.com
Sun Oct 21 17:59:49 UTC 2018

I'm somewhat familiar with a couple of places that Alaska Dave has mapped,
and they're the sort of places where the shoreline must be mapped from
winter, 'leaves down' aerials, because otherwise the shoreline is obscured
by overhanging trees and matted aquatic vegetation.

On Sun, Oct 21, 2018, 13:42 Mateusz Konieczny <matkoniecz at tutanota.com>

> Is forest starting immediately on the water edge or is there a
> beach/marsh/whatever between
> water and forest?
> With shoreline as border of both water and forest it is OK to reuse it, if
> there is - even
> currently unmapped - feature between them then reusing ways is only going
> to make
> life of future mappers more irritating.
> 20. Oct 2018 11:38 by daveswarthout at gmail.com:
> Another situation that occurs quite frequently in my mapping (in Alaska
> especially), is when an island defined by natural=coastline is also covered
> right to the water with natural=wood. Usually, I duplicate the coastline,
> shrink it a bit, and then tag it with natural=wood. But yesterday I tried
> something new, new for me anyway, and that was to create a single-member
> multipolygon from the coastline way and then tag the resultant relation
> with natural=wood in order to reduce the number of nodes used. I was
> pleased that JOSM didn't complain and that the island seemed to render okay
> but I'm not sure this is a legitimate procedure.
> ,
> The island is at 58.56588, -152.59579 and the relation ID=8828482
> What do you think is the best approach to handle this situation?
> Dave
> --
> Dave Swarthout
> Homer, Alaska
> Chiang Mai, Thailand
> Travel Blog at http://dswarthout.blogspot.com
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