On Mon, Dec 14, 2009 at 10:36 PM, John Smith <span dir="ltr"><<a href="mailto:deltafoxtrot256@gmail.com">deltafoxtrot256@gmail.com</a>></span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
2009/12/15 Steve Bennett <<a href="mailto:stevagewp@gmail.com">stevagewp@gmail.com</a>>:<br>
<div class="im">> On Tue, Dec 15, 2009 at 1:31 PM, Anthony <<a href="mailto:osm@inbox.org">osm@inbox.org</a>> wrote:<br>
>> In a park is a ditch. There is a very small bridge going over the ditch.<br>
>> I've tagged the ditch with barrier=ditch. Should the ditch be layer=-1?<br>
>> Even though the park is layer=0?<br>
><br>
> Layers are only there to explain the relative heights of things when<br>
> they meet. No harm will result from marking the ditch as layer -1.<br>
> Whether or not it needs to be a lower number than that of the bridge<br>
> is an unresolved question.<br>
<br>
</div>I tend to mark bridges as layer=1 and anything at ground level I don't<br>
set a layer tag, which seems the most logical to me since ditches<br>
aren't under the ground etc.<br>
</blockquote></div><br>I tend to agree with you, but:<br><br><a href="http://wiki.openstreetmap.org/wiki/Image:IMG_6783.JPG">http://wiki.openstreetmap.org/wiki/Image:IMG_6783.JPG</a><br><br>Are both of those bridges layer=1? At least the road one, and arguably both, are effectively at "ground level".<br>
<br>Right now I have the ditch with no layer tag (this way it acts as a barrier to travel through the park at layer=0). But it doesn't feel right putting the bridges at layer=1. So I've used barrier=entrance for the node where the way and the ditch cross. For the part going under the road, I have barrier=ditch, tunnel=yes. Which, I don't know, is the part I like the least. But the ditch isn't really a ditch at the time it goes under the road. It's more of a drain pipe. Is there a tag for drain pipe? (I'll check the wiki right after I hit send).<br>