[OSM-talk] How to mark a footpath that goes under a bridge

[John F. Eldredge]

So, ground level is level 0?  I had wondered about that, as the scanty documentation that I have seen didn't make that point clear.

-- 
John F. Eldredge -- john at jfeldredge.com
"Reserve your right to think, for even to think wrongly is better than not to think at all." -- Hypatia of Alexandria

-----Original Message-----
From: David Earl <david at frankieandshadow.com>
Date: Sat, 28 Nov 2009 13:56:23 
To: <john at jfeldredge.com>; <talk-bounces at openstreetmap.org>
Subject: Re: [OSM-talk] How to mark a footpath that goes under a bridge

On 28/11/2009 13:52, John F. Eldredge wrote:
> I am in the process of learning how to use JOSM to transform a GPS
> trace into a way, and have a question about how to mark a footpath
> that passes under a highway bridge.  As I understand the conventions,
> placing a node at this crossing point would imply that they connect
> to each other, which is not the case.  Should the ways simply cross,
> relying on the layer tag to mark which one is above the other?  The
> existing highway data, probably derived from a TIGER import, does not
> indicate bridges as opposed to regular roadways.

The should cross, not connect, but the higher way one should be split
along the length of the bridge and marked layer=1, bridge=yes (unless
the footway is more a tunnel under the line, in which case instead split
the footway and mark the sub-railway section as layer=-1, tunnel=yes)

(This isn't JOSM specific BTW)

David