On Mon, Jul 26, 2010 at 8:45 AM, Dave F. <[email protected]> wrote: > On 26/07/2010 13:35, Nathan Edgars II wrote: >> >> On Mon, Jul 26, 2010 at 8:28 AM, Dave F.<[email protected]> wrote: >>> >>> Layer is used purely as an aid to the renderer to distinguish where two >>> or >>> more ways *cross* each other: >> >> Not quite purely - it gives nonredundant spatial information when a >> bridge goes over another. Not that this has anything to do with the >> layer_change proposal. > > "nonredundant spatial information" > > What's that when it's at home?
Information about the relationship of two physical objects to each other that isn't otherwise in the data. In other words, if you have two bridge=yes ways crossing without an intersection node, that tells you nothing about which one is the higher bridge. layer=* adds that information. _______________________________________________ Tagging mailing list [email protected] http://lists.openstreetmap.org/listinfo/tagging
