OK, I have read most all the wiki pages and I'm not getting how the
restrictions are being defined. So a little help getting over the mind
block I seem to be having for this.
Everything else seems really straight forward, so I can't imagine that
the restrictions are all the complicated, but it is not clicking with
any confidence in my head yet.
If I have the following:
a----b-----c
|
|
d
ab, bc, and db are all two way
and there is no right turn from db to bc
Then is the restriction:
b, d, c, forbidden, 7F 00 00
where:
b is the via-node
d is the from-node
c is the to-node
and the records should then be sorted by EDGE[via-node, to-node] ref.
Is this correct?
Thanks,
-Steve
On 11/9/2013 2:52 PM, Stephen Woodbridge wrote:
Yes, but I will read it again.
I'm still trying to get up to speed on everything.
Dennis, if you can answer my questions below that would be appreciated.
By the way, I'm extremely pleased that you have redone this under the
BSD license. I look forward to workign with you guys and integrating
this into pgRouting.
Thanks,
-Steve
On 11/9/2013 12:17 PM, Emil Tin wrote:
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 <[email protected]
<mailto:[email protected]>> 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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