On Mon, Jul 26, 2010 at 2:56 PM, Dave F. <[email protected]> wrote: > On 26/07/2010 14:07, Richard Mann wrote: >> If you draw the >> grey in the correct layer, then you get little semi-circular arcs of >> grey at the end of bridges (if they are layer=1). > > I've never noticed this in Mapnik,or an other. Do you have examples of these > please.
http://www.openstreetmap.org/?lat=51.45445&lon=-0.96211&zoom=17&layers=O > > >> So renderers have to do something. Different renderers have come up >> with different solutions, but all produce artefacts because there's a >> piece of data missing > > What data is this? > That one way is at a higher layer than another that it connects to. You can infer this from bridge=yes, but it doesn't always work, and you can't infer it directly from tunnel=yes. >> (which they could pre-process, sure, but there >> are better uses of time). It would be more effective to give them the >> data, and have renderers do it reasonably well consistently. > >> What I've suggested isn't the only solution, but it's the most >> economical, I think. > > So your saying to save the renders time, the data collectors have to waste > time adding new tags? > > It sounds like a rendering software problem to me & nothing to do with > tagging. It could be fixed by the renderer, though they haven't to date, and some of them (me included) can't with the tools available. > > I still don't see how layer_change solves anything. It fills a hole in the data model. At the moment, for almost all rendering tasks, I only have to look at the tags on the way and it's nodes. Without layer_change, I either have to pre-process information from the attached ways, or simplify, or make a plausible guess. With layer_change I just do what the tags tell me. > AFAICS it just adds even > more separated sections which cause other render problems such as one-way > arrows overlapping & cutoff name & ref labels. > now that is the sort of stuff for renderers to solve; it's a much more general problem than a few tunnel ramps > > incidentally, is there a reason you've joined the cycle path to the overhead > power line? > Weren't me guv, but I've fixed it. _______________________________________________ Tagging mailing list [email protected] http://lists.openstreetmap.org/listinfo/tagging
