[Tagging] Culverts and Fords

[Ralph Aytoun]

The real easy way to understand culverts and fords for OpenStreetMap is about the layers they are on and this dictates the nodes they use.

For a  ford the stream/river is at the same level as the road (effectively layer=0) and therefore they are able to share a node.

Because a culvert (layer=-1)  is not on the same level as the road but passes underneath so it cannot share a node with the road and therefore the culvert is attributed to the river/stream with a node either side of the road.

With a bridge the road (layer 1)  is not on the same level with the stream/river so again cannot share a node and therefore the bridge is attributed to the road with a node at each end of the bridge.

Hope this will be of help in understanding the problem.


Sent from Mail for Windows 10

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/tagging/attachments/20180302/3178923b/attachment.html>