[OSRM-talk] Questions on OSRM normalized file format

[Emil Tin]

Hi Stephen,

Back in April I wrote a wiki page detailing the internal processing flow and data structures, did you see it?
  
https://github.com/DennisOSRM/Project-OSRM/wiki/Processing-Flow

Maybe there is some useful info there.

Dennis can probably tell you what has changed since April.


Best regards,
Emil




On 09 Nov 2013, at 17:38 , Stephen Woodbridge <woodbri at swoodbridge.com> wrote:

> Hi all,
> 
> I'm currently the lead developer for pgRouting and I'm interested in being able to create a local instance of OSRM that can be accessed via pgRouting. This all seems pretty straight forward to prototype up.
> 
> At the moment, I have a few questions on OSRM normalized file format. I want to be able to write a utility program for postgresql to prep and dump a pgRouting topology to an OSRM normalized file.
> 
> Looking at the edge section:
> 
> It appears that edges can be entered as undirected (ie: twoway with same costs in both directions) or directed in the case of oneway streets.
> 
> 1. if I have a edge with different to-from and from-to costs am I correct in assuming that the way to enter this is to split the edge and enter it as two oneway edges with the appropriate costs?
> 
> 2. oneway edges must be entered where from->to is the direction of the edge, ie: the direction must be to the target node?
> 
> 3. Can you expound on the "rank of the speed profile"? Is this still used? in the Speedprofile page it says that this is now handled as LUA scripts.
> 
> Looking at the turn restrictions section:
> 
> Is there a graphic that explains this better. It is a little bit hard to follow where the various items come into play. There are references to via-node, from-node, to-node, from-way, and to-way.
> 
> Here is a common use case that I need to model. It is a majow road digitized as separated north and south bound lanes and intersected by a two way street digitized as a single line.
> 
>          e     h
>          |     |
>          |     |
>          |     |
> a---------b-----c---------d
>          |     |
>          |     |
>          |     |
>          f     g
> 
> Traffic is allowed:
> ab-bc-cd   - east bound cross traffic
> dc-cb-ba   - west bound cross traffic
> eb-bf      - one way south bound traffic
> gc-ch      - one way north bound traffic
> ab-bc-ch   - east bound onto north bound
> ab-bf      - east bound onto south bound
> dc-ch      - west bound onto north bound
> dc-cb-bf   - west bound onto south bound
> eb-ba      - south bound onto west bound
> gc-cd      - north bound onto east bound
> 
> U-Turns are not allowed:
> eb-bc-ch   - south bound u-turn to north bound
> gc-cb-bf   - north bound u-turn to south bound
> 
> and more obviously any turn the wrong way down a oneway edge.
> 
> Any help in understanding this would be greatly appreciated.
> 
> Thanks,
>  -Steve
> 
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