[OSM-talk] Ditches

[Steve Bennett]

On Tue, Dec 15, 2009 at 2:36 PM, John Smith <deltafoxtrot256 at gmail.com> wrote:
> 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.

The one benefit of marking waterways layer=-1 (particularly for long
ones) is that it's protection against anyone else forgetting to set
layer=1. That is, someone else might draw a bridge over it somewhere
and not set the layer. Well, if the waterway itself is -1, that will
still behave the same.

(And there's no downside)

Steve