[GraphHopper] Detecting the orientation of an edge against the orientation of the way in OSM

[graphhopper]

Hey Bruno,

in a version before 0.3 it was hard to find out the orientation of *an
edge* as for bidirectional algorithms there is a forward and backward
search going on. Maybe a solution via your "baseNode < adjNode" check is
the only one.

*But* now that I better understand your use case ... to find out how the
original *OSM way* (not the edge) is oriented is impossible as we
"forget" this information while import. What do you want to achieve with
this or what information relies on the original OSM way orientation?

Regards,
Peter.


> Hi,
> The reverseNavigation flag is meant to tell me if the edge passed as
> parameter
> will be used in the path returned by route() in the same direction as
> the edge's way in the OSM file, or in the reverse direction.
>
> I use this information in order to apply the overrides that we
> implemented at Rinkai.
>
> From what I understood in yesterday's discussion, in the current
> release there is already such a flag beeing passed to the weighting
> function, but I am using a cloned repository which was last merged
> march 17.
>
> Thanks
> Bruno
>
>
>
> ----- Forwarded Message -----
> Sent: Wednesday, June 11, 2014 4:27 PM
> Subject: Re: Detecting the orientation of an edge against the
> orientation of the way in OSM
>
> Hey Bruno,
>
> looks like my mail in yahoo.de <http://yahoo.de> does not like message
> from your yahoo.com <http://yahoo.com>
> ;) hope they'll resolve this somehow. (for now keep me in CC)
>
> What do you want to achieve with reverseNavigation?
>
> The reverse variable is necessary if the backward search is going on -
> e.g. you need to call edge.getReverseSpeed. So I guess you just need
> reverseNavigation=reverse but not sure ...
>
> Regards,
> Peter.
>
>
>
>
> > Hi,
> > I have some code to override the edge's weight depending on the
> orientation of the way in OSM. Please could you tell me if the snippet
> below is correctly detecting the orientation of the edge against the
> orientation of the way in OSM? My doubt is mainly for the first
> statement reverseEdge=...
> >
> > public double calcWeight( EdgeIteratorState edge, boolean reverse )  {
> >     ...
> >     // is the edge in the same direction as way in OSM
> >
> >     boolean reverseEdge=edgeIteratorState.getBaseNode()
> <edgeIteratorState.getAdjNode();
> >     ...
> >
> >     // compare reverseEdge and reverse to figure out if we are
> navigating the edge forward
> >
> >     // or backward according to way in OSM
> >     boolean reverseNavigation=reverseEdge!=reverse;
> >     ...
> >
> > Thanks!
> > Bruno   
> >
>
>
> --
> GraphHopper.com - Fast & Flexible Road Routing
>
>
> _______________________________________________
> GraphHopper mailing list
> GraphHopper at openstreetmap.org
> https://lists.openstreetmap.org/listinfo/graphhopper

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/graphhopper/attachments/20140612/1490440c/attachment.html>