Thank you Ralph, I understand your perspective, but have to disagree a bit (I'm not looking for a battle, however).
A ford is a stack of layers that are directly adjacent vertically, with the road slightly below the stream/river. In the dry season a ford is only a road and only becomes a ford when a watercourse flows over the top of the road. A culvert is a part of of road construction, a culvert would not exist without the road, but the culvert is utilized by the stream. Personally I have physically installed culverts in road profiles where there is no watercourse. If I try to add a culvert in JOSM without an additional tag I get a validation warning. Wouldn't a road/stream crossing without a culvert or bridge be called a dam? Isn't a culvert similar in rendering to an embankment? An embankment is a tag applied to a road or railroad, but it is a level beneath the road or railroad. A culvert happens to be perpendicular or so to the road rather than adjacent to it. Part of this discussion also is a matter of scale. At some rendering of a map even a place like Paris would be displayed as a node. In the same way a culvert displayed as a node would be appropriate at certain zoom levels. I think an easy solution is to make the rendering rule for culverts be a layer below the road and allowed to be a node. I think this is an interesting discussion and is helping me understand different points of view, thanks. Emmor On Fri, Mar 2, 2018 at 12:39 AM, Ralph Aytoun <[email protected]> wrote: > The real easy way to understand *culverts* and *fords* for OpenStreetMap > is about the layers they are on and this dictates the nodes they use. > > > > For a *ford* the stream/river is at the same level as the road > (effectively *layer=0*) and therefore they are able to share a node. > > > > Because a culvert (*layer=-1*) is not on the same level as the road but > passes underneath so it cannot share a node with the road and therefore the > culvert is attributed to the river/stream with a node either side of the > road. > > > > With a *bridge* the road (*layer 1*) is not on the same level with the > stream/river so again cannot share a node and therefore the bridge is > attributed to the road with a node at each end of the bridge. > > > > Hope this will be of help in understanding the problem. > > > > > > Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for > Windows 10 > > >
_______________________________________________ Tagging mailing list [email protected] https://lists.openstreetmap.org/listinfo/tagging
