-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 flo Detig wrote: > Marcus Wolschon wrote: >> I think it would be better to discuss basic >> storage and indexes first before going on >> about special optimizations. >> > I agree with that. > Is there some lowest common denominator for a generalized routing format? > Something everyone could use / need who works on routing osm data? > There is a nice visual description by Michael Josenhans in the wiki > http://wiki.openstreetmap.org/index.php/OSM_Routing_Data_Layer > As a first step merge the intermediate nodes of degree two? > Is this simple enough to fit everyone? > Does it make sense to add this to the database (maybe in pgrouting > compatible format)? > Or just some kind of transformation script that outputs osm-xml again? > Anyone interested?
Personally, I don't think OSM should be trying to do this in the abstract. I think that as people develop routing applications, they should develop their own formats and converters from OSM XML format, optimised to how their particular applications work. As routing applications evolve, they could copy ideas and formats from each other. I don't think we should try to invent a format that is targeted at a particular market. It may be worth repackaging OSM XML and changesets as a binary format that is more compact, but routing applications would still need to index it before they could use it. Certianly I don't think that OSM centrally should be splitting the data into "routing layers". Competing routing algorithms should be making that kind of decision. It will break if you choose something like "avoid motorways" because the motorway layer would just become completely inapplicable. What if someone wants to make a system that lets you route over public transport? All the data is in OSM, but all the assumptions about how to index a routing format would be completely invalid. Robert (Jamie) Munro -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.8 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkj3IYsACgkQz+aYVHdncI12kwCg73tgU1Xc8AQ6ze5oAzMIea7U EZ8An0LWHVt2QG1Z+SNQ/nrvP100dCMm =I0Xu -----END PGP SIGNATURE----- _______________________________________________ Routing mailing list [email protected] http://lists.openstreetmap.org/listinfo/routing
