On Mon, Jul 26, 2010 at 7:59 PM, Dave F. <[email protected]> wrote: > On 27/07/2010 00:28, Nathan Edgars II wrote: >> >> 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. > > That's what I meant. Maybe I should have said 'crosses over'
But it's not solely an aid to the renderer. Which bridge is higher is a useful bit of data. _______________________________________________ Tagging mailing list [email protected] http://lists.openstreetmap.org/listinfo/tagging
