Doesn't layer=-1 mean that something should be 'below' the landuse polygons when rendering? So if you have a river at level=-1 on a landuse=farm, then you will never see the river because it's under the (default layer=0) ground.
In fact, I'm surprised the robot didn't automatically add a tunnel=yes to the rivers that were tagged layer=-1... (which would probably be valid for those cases where a stream just goes through a pipe to get under the road - that could hardly be described as 'a bridge') On Sat, Dec 20, 2008 at 8:32 PM, "Marc Schütz" <[email protected]> wrote: >> I also tag many waterways around here as layer=-1, because that's what >> they >> are... thank god they aren't layer=0 or the place would be under water! > > I know that many people assume that layer=0 means ground level, but this > assumption is unnecessary. Indeed, the wiki (AFAICS) doesn't state it either, > merely that data consumers should assume layer=0 if no layer tag is present. > > This of course also means it's perfectly okay to tag a river with layer=-1, > so as to not require a layer tag on bridges. > > Regarding the claim about layer on bridges being tagging for the renderer: > > I disagree. The layer tag is a "workaround" for deficiencies in our data > model (which only provides for two dimensions), the same way as area=yes is a > workaround for there not being a polygon primitive. And being redundant (i.e. > derivable from another tag, which it unquestionably is in many cases) does > not make it tagging for the renderer. Contrarily it keeps the information of > vertical order in one tag instead of spreading it over several (layer, > bridge, tunnel, power=line etc.) And noone would call highway=track tagging > for the renderer because it is redundant if there already is a > tracktype=grade2. > > Regards, Marc > > -- > Psssst! Schon vom neuen GMX MultiMessenger gehört? Der kann`s mit allen: > http://www.gmx.net/de/go/multimessenger > > _______________________________________________ > talk mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/talk > _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
