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Hello, |
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The best solution would be to split the relation into two parts, one for each driving direction. In the US, directional roles have been used: north/south/east/west, but this does not seem to be the convention in France. I would include the two new relations in a super relatin, too
(28 Feb '11, 20:56)
Paul Johnson
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I'm not that an easy solution exists. Maybe you can code (for example with python and DOM) an analyser on the data that, starting from a node, build the set of ways that are connected. Hello Nicolas, Yes this is what I ended up with : I split the relation in x parts on my side by finding which ways have common nodes.
(27 Feb '11, 14:20)
y0n3l
Good. Maybe you can flag your question as answered :-) And it will be nice to post your script if it is possible.
(28 Feb '11, 10:42)
NicolasDumoulin
Yes, I'll flag the question as answered, but I was waiting for a little while to see different answers (actually I think that Mike's answer is the right one, after a more in depth look , I saw that some french highways were using this tag, but only a few of them). For the scripts , humpf, it's written in ObjectiveC so unless you're in the Mac / iOS I think it's useless :/ Are you the guy from http://pld.dumoulin63.net ? I'm also on open street map fr ;)
(28 Feb '11, 20:31)
y0n3l
Ok, ObjectiveC will be useless for me. Yes, it's the same dumoulin ;-)
(01 Mar '11, 08:43)
NicolasDumoulin
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You could try ignoring relations, and extracting "WayChains". A chain of ways that are connected end-to-end. My WayChains TIGER fixup analysis does this kind of thing (on motorways as it happens, although it would work for other kinds of end-to-end connected ways) The logic to join together ways into "waychains" can be found in waychainsummary.rb. I'm running it with a pre-processing step using my osmosis simplify plugin, which reduces ways down to just their start node and end node. Note however that I was deliberately designing this to help find problems in the U.S. motorways data. For extracting OpenStreetMap data for practical use, you may find this approach a little fragile. e.g. if a mapper tags an onramp with highway=motorway instead of highway=motorway_link, then it may not chain the ways correctly at that point. You'd have to fix it before trying again. |
