I'll repeat what I told him through the OSM messaging system: > First of all, how did you determine that these features were in fact > "ground-level"? Many times when I set layer=-1 on something it's at least a > few feet below the surrounding terrain, if not more.
That's still ground-level. Look at the contour lines on a topo map; they'll dip down to follow manmade cuts. Negative layers are for tunnels that are underneath ground level (layer 0). > > Secondly, it is apparent that you didn't check the layer tags of all features > (such as bridges) that pass over these "ground-level features". Now there are > many instances of layer-0 bridges crossing over roads that do not have any > layer tags. Sounds like the problem is tagging the bridges as layer=0. A bridge is, by definition, usually above the immediate ground level. If you wish, I can go looking for bridges tagged as layer=0 and change them to layer=1. By the way, the immediate impetus for removing said negative layers was the large number of highways tagged layer=-1 in areas far from any bridges. So you'd have the main street through a town supposedly underneath any intersecting features (rendered as such and logically such in the underlying data). You may have noticed many residential/unclassified highways rendering above these more major layer=-1 roads. This is probably one of the initial reasons for giving bridges positive layers; they're already split from the longer ways. _______________________________________________ Talk-us mailing list Talk-us@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-us
