Peter Childs <pchi...@bcs.org> writes: >>>I decided that what would be fun to implement is a routing algorithm >>>that can find the best (shortest or quickest) route between any two >>>OSM highway nodes. I know that there are other routing algorithms >>>available but this started as an intellectual exercise so I developed >>>my own. It seemed to work so I added a fancy web front end to it and >>>put it on a server. >>> >>>http://www.gedanken.org.uk/mapping/router/router.html
> Neat, there seam to be a lot of good routing method appearing for OSM. > All with interesting differences over what the commersial sources > produce, (eg Google, Multimap, etc) Not usually wrong but different, > > Does anyone know of any Routing code thats Open Source. > > Is there any way to encourage the system to use Dual Carriage Way > Primary Roads over Single Carriage Way Primary Roads (or in this case > Seconday) eg eg A289 vs B2108 is Strood, Kent. Encouraging dual-carriageway rather than single will need some way of detecting one rather than the other. Perhaps lanes=n (n>1) and oneway=true would work if enough people tag them like that. For the problem of preferring primary roads instead of secondary I already have a solution but not an implementation (yet). Instead of a checkbox to allow or disallow a particular type of highway there would be a percentage preference. This means that you could set primary roads to 100% and secondary roads to 50%. When planning the route and there is a choice between the two then the secondary will only be taken if the route is less than 50% of the length of the primary. In general a highway type with a weighting of W% would appear 100/W times as long as it really is. > Also people seam to have used Trunk and Primary interchangeable. what > is meant to be the difference. For the UK this is simple: http://wiki.openstreetmap.org/index.php/Map_Features#Highway -- Andrew. ---------------------------------------------------------------------- Andrew M. Bishop a...@gedanken.demon.co.uk _______________________________________________ Talk-GB mailing list Talk-GB@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-gb
