[Routing] Driving directions web map

[Frederik Ramm]

Hi,

flo wrote:
> Are there any approaches to 'normalizing' or 'layering'?  (like freeway- 
> / primary- / secondary Graphs)?

Every routing software/project does their own preprocessing. Navit has 
its own compiler, gosmore has a built-in compiler for creating an 
indexed tree file, openrouteservice uses unreleased code to create their 
routing graph inside a database.

At one time I thought about making general preprocessed routing graphs 
available on the Geofabrik web site in regular intervals but I then 
decided not to as every routing software has its own style anyway, doing 
different things in the preprocessing step.

(If, however, members of this list come up with some generalized format 
for an OSM routing graph plus the algorithm that creates it, then I'd be 
happy to look into providing such a routing graph available to all on a 
regular basis. Does pgrouting have something like a recommended general 
graph structure that would be suitable an usable to many?)

Bye
Frederik