[OSM-talk] Ditches

[John Smith]

2009/12/15 Steve Bennett <stevagewp at gmail.com>:
> On Tue, Dec 15, 2009 at 1:31 PM, Anthony <osm at inbox.org> wrote:
>> In a park is a ditch.  There is a very small bridge going over the ditch.
>> I've tagged the ditch with barrier=ditch.  Should the ditch be layer=-1?
>> Even though the park is layer=0?
>
> Layers are only there to explain the relative heights of things when
> they meet. No harm will result from marking the ditch as layer -1.
> Whether or not it needs to be a lower number than that of the bridge
> is an unresolved question.

I tend to mark bridges as layer=1 and anything at ground level I don't
set a layer tag, which seems the most logical to me since ditches
aren't under the ground etc.