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 (n1) 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
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