On Wed, Jan 27, 2010 at 9:47 AM, Dave F. <[email protected]> wrote:
> It's my understanding that bridge has an implied tag of level=1. I only add > level=* when I have multiple bridges crossing each other. > Were that the common understanding, the render that did not would be wrong. But it is only the common Mapnik behavior. The Map Features description for Bridge does not give such an implication, it should be listed under implies if it were agreed. http://wiki.openstreetmap.org/wiki/Key:bridge instead gives example of proper use highway <http://wiki.openstreetmap.org/wiki/Key:highway>=primary <http://wiki.openstreetmap.org/wiki/Tag:highway%3Dprimary> + *bridge*=yes + layer <http://wiki.openstreetmap.org/wiki/Key:layer>=1 + name <http://wiki.openstreetmap.org/wiki/Key:name>=*usually the road over the bridge* + ref <http://wiki.openstreetmap.org/wiki/Key:ref>=* and then specifically states "Tag layer <http://wiki.openstreetmap.org/wiki/Key:layer>=* is used to separate things that are physically on different levels. "The tag *bridge*=* does not imply anything about layers, "so if your bridge crosses any feature on layer <http://wiki.openstreetmap.org/wiki/Key:layer>=0 (the default if not present), "you should consider adding a layer <http://wiki.openstreetmap.org/wiki/Key:layer>=1 (or higher)." The OSM wiki Map Features section docments that a word means in OSM data as a tag or tag-value. As Data, it is only valuable to the extent we can maintain consistency. -- Bill [email protected] [email protected]
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