On Sat, Aug 8, 2009 at 1:20 AM, Roy Wallace <[email protected]> wrote:
> In other words, at any node which is a junction of way > segments with different layers (whether the segments are part of the > same way or different ways), the physical implication is that the > slope of the way changes in the close vicinity of that node. I think > this would then allow for layer transitions at T-junctions. > You can only get away with this if all of the arms of the junction render the same (yes it is tagging for the renderer; that is only bad if you falsify to achieve a rendering effect). Highway T-junctions are significantly more likely to have undesirable rendering effects, so it's a good idea to have all arms at the same layer. Nodes with only two ways (an I-junction?) and waterway T-junctions are much less likely to cause rendering problems if the layers are different. If you want to infer that the layer changes in the vicinity of the layer-change node, feel free, but it's probably safer to infer that it gradually changes along the length of the way that is layer<>0. Richard
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