No, the bridge, called Hollandse Brug, is not a dam, although the bridge separates two waterbodies. The one to the northwest is called the Markermeer, and the other one is called Gooimeer.

https://www.google.nl/search?q=hollandse+brug&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a

On the other hand, the Houtribdijk (dijk Enkhuizen-Lelystad) is a dam, but that is not indicated by the coastline. See http://osm.org/go/0E7zb56-- The waterbody to the northeast is called the IJsselmeer (IJssel lake), and to the southwest is the Markermeer again.

I think that the big lakes (IJsselmeer and Markermeer) should be tagged as coastline. They form a distinct part of the outline of the Netherlands. The Gooimeer, and the other lakes bordering Flevoland (like Veluwemeer, etc.) are not.

Actually, that would be tagging for the renderer, which is bad. (The bigger lakes are freshwater lakes.) Shouldn't coastlines be reserved for the coasts of seas and oceans only?

Frank

Quoting Martin Koppenhoefer <dieterdre...@gmail.com>:

2012/10/3 Martin Vonwald <imagic....@gmail.com>:
Hi!

Any reason why the coastline should go around a bridge?

http://tools.geofabrik.de/osmi/?view=coastline&lon=5.13984&lat=52.32549&zoom=16&opacity=0.55&overlays=coastline_error_lines,line_not_a_ring,line_overlap,line_invalid,line_direction,questionable,coastline_error_points,unconnected,intersections,not_a_ring,double_node,tagged_node


that's obviously nonsense :D, or is it a dam?

cheers,
Martin

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