This is an interesting topic which is well worth discussion, but to return to the original question for a moment. The issue is that mapnik is not capable of rendering a way that is both a path and an area. The example given was highway=service, amenity=parking.
Regardless of whether people are centerlineists or not, there are always going to be mappers who will tag ways this way. We have a free form tagging scheme so we cannot prohibit such things. For example, a way tagged as highway=waterway, power=line (two linear tags) might be unusual (water and electricity generally don't mix ;) but we cannot disallow it. So, if a way is tagged as highway=service to describe a road, but also amenity=parking to indicate that the road *"is part of the car park and defines its boundaries"* then that's the way it is. Suggesting that the data be changed to accommodate the deficiency of a particular renderer is very much a case of mapping for the renderer. This is a principle that is important to uphold. Fix the renderer not the data. Back to the centerlineist discussion... 80n On Thu, Sep 25, 2008 at 11:30 AM, Frederik Ramm <[EMAIL PROTECTED]> wrote: > Hi, > > On 25.09.2008, at 12:23, Ed Loach wrote: > > I would agree, and if Frederik does want to tag roads as areas he > > could use the width= and/or est_width= tags, although it is unlikely > > that the renderers use them, assuming that the widths they currently > > render are based on just the highway= value and doesn't take into > > account any width tags (though I may be wrong). > > Well I don't necessarily want to tag roads as areas, I just want to > map the fact that something (e.g. a forest) extends exactly up to the > road. If the road is 0 metres wide (or "as wide as the renderer wants > it to be"), then the only way to map this is to re-use the road > centreline as a forest border. If the road had a left and right > shoulder line then I could use that to delineate the forest border. > > It all boils down to whether the forest border and the road are > independent of each other or whether you simply wanted to express > "the forest stops at the road" (which is often the case for landuse > or administrative areas, less often for forests). > > Bye > Frederik > > -- > Frederik Ramm ## eMail [EMAIL PROTECTED] ## N49°00'09" E008°23'33" > > > > > _______________________________________________ > talk mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/talk >
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