On Thu, Jun 5, 2008 at 5:24 PM, Martijn van Oosterhout <[EMAIL PROTECTED]> wrote: > On Thu, Jun 5, 2008 at 2:07 PM, Dave Stubbs <[EMAIL PROTECTED]> wrote: >> Layer tags on areas are pure evil. The layer tag is there to indicate >> vertical separation, not to give a handy z-order hint to the renderer. >> So unless you do genuinely have two areas which are physically >> suspended one on top of the other then please don't add layer tags! >> Thankfully the mapnik maps will just ignore them. > > Not entirely. On the NL list we had a building overlapping a water > area and mapnik was drawing them in the wrong order. Due to the > shapes, the building covered more area. Perhaps longterm we should > change the styles to always draw buildings over waterways, but for now > a layer tags fixes it nicely. >
It might fix it. But it doesn't fix it nicely. You're taking something meant to represent a physical property, and abusing it to produce a pretty map. The question here is whether your building is actually over the water or not; if it is then adding the layer tag is actually correct for once, but if it isn't then please, please invent a new tag rather than abuse an existing one. Although that's been going on for ages now with the layer tag, so it's quite possibly useless except as a render hint which is a pity. At least it's not quite as silly as natural=land. Dave _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
