On 31/01/2013 12:37, Martin Koppenhoefer wrote:
drawing the outline seems a good approach as it permits to group visually (and topologically) different carriageways running over the same bridge (as opposed to two parallel bridges).
This is approach is used by IHO for marine chart data. Where a bridge has more than span, they further divide the bridge outline into two or more butted polygons, one for each span, so that each span can have its own height & width attributes. They also map bridge piers as separate objects.
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