On Tue, Sep 8, 2009 at 7:27 PM, Alex Mauer <[email protected]> wrote: > On 09/07/2009 01:51 PM, Richard Fairhurst wrote: >> can use any tags you like. But from the outside, there doesn't seem to >> be any huge agreement on how it's used (I mean, what is this >> 'designated' shit?), > > Conveniently, there's a wiki page dedicated to documenting it: > > http://wiki.openstreetmap.org/wiki/Tag:access%3Ddesignated > > It’s even pretty > >> and so the render rules are going to have to be >> really complex to cope with the many possibilities. > > (highway=path AND bicycle=designated) OR highway=cycleway => Render like > a cycleway.
last time I tried to figure this out the rule ended up looking a bit like: ([highway] = 'path' and ([bicycle] = 'designated' or [bicycle] = 'yes')) or [highway] = 'cycleway' then i had to modify the foot path rendering as well (([highway] = 'path' and ([foot] = 'designated' or [foot] = 'yes') and [bicycle] <> 'designated' and [bicycle] <> 'yes') or [highway] = footway then we have cycle bridges of course so: (([highway] = 'path' and ([bicycle] = 'designated' or [bicycle] = 'yes')) or [highway] = 'cycleway') and [bridge] <> '' altering the original to not match bridges (([highway] = 'path' and ([bicycle] = 'designated' or [bicycle] = 'yes')) or [highway] = 'cycleway') and [bridge] = '' and the foot bridges become: ((([highway] = 'path' and ([foot] = 'designated' or [foot] = 'yes') and [bicycle] <> 'designated' and [bicycle] <> 'yes') or [highway] = footway) and [bridge] <> '' You can see how this blows up out of any maintainability quite quickly, especially with the proliferation of 'yes' values since the original highway=path proposal (I think, I wasn't following too closely). And to boot I wasn't even sure that those were correct. And that's why it's not been done. Obviously our stylesheets/data processing (we're using the original mapnik stylesheet syntax) needs to work in a different way to cope with all this -- but getting that done is a lot of work. It's not a huge personal priority as I don't think I've ever used the highway=path tag, not for a cycle related route at least. Oh, incidentally.. someone mentioned on here that MTB routes aren't rendered, now I can't find the post... -- that's not stricting true -- way way way back in the day I added a few in wales with a route relation route=bicycle, network=mtb .. probably not the best tagging in the world but the cycle map does render them.. look!: http://www.opencyclemap.org/?zoom=12&lat=52.55544&lon=-3.79561&layers=B000 Unfortunately we added hillshading since then so the green doesn't really work, but hey ho. Dave _______________________________________________ newbies mailing list [email protected] http://lists.openstreetmap.org/listinfo/newbies
