Hi
Is there a way of saying the link between nodes A and B in a given network
is a one way connection?
I had assume that setting the to_cost/reverse_cost would be the way to go,
but I have not see this type of thing describe on any of the web pages.
regards
Dave.
--
Ok the matter is addressed in
http://www.pgrouting.org/docs/howto/oneway.html
You just make the value for the cost to be very high, is there a given
value that should be used?
Dave Potts wrote:
Hi
Is there a way of saying the link between nodes A and B in a given network
is a one way connection?I had assume that setting the to_cost/reverse_cost would be the way to go,
but I have not see this type of thing describe on any of the web pages.regards
Dave.
--
_______________________________________________
Pgrouting-users mailing list
Pgrouting-users@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/pgrouting-users
--
On Wed, Jan 18, 2012 at 4:31 PM, Dave Potts <dave.potts@pinan.co.uk> wrote:
Ok the matter is addressed in
http://www.pgrouting.org/docs/howto/oneway.html
You just make the value for the cost to be very high, is there a given
value that should be used?
Well, you can make it high that you can be sure that it will be longer than what could be a valid total length of a route.
And if your result will be longer than that, you can assume that it took a one-way street in the wrong direction, because probably there was no other way.
Daniel
Dave Potts wrote:
Hi
Is there a way of saying the link between nodes A and B in a given network
is a one way connection?I had assume that setting the to_cost/reverse_cost would be the way to go,
but I have not see this type of thing describe on any of the web pages.regards
Dave.
–
Pgrouting-users mailing list
Pgrouting-users@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/pgrouting-users–
Pgrouting-users mailing list
Pgrouting-users@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/pgrouting-users
–
Georepublic UG & Georepublic Japan
eMail: daniel.kastl@georepublic.de
Web: http://georepublic.de
I am confused about the one way street issues.
The page http://www.pgrouting.org/docs/howto/oneway.html, says use a high
cost value eg 1000, but the page
http://www.pgrouting.org/docs/1.x/dijkstra.html says 'a negative cost will
prevent the edge from being inserted in the graph' ie use -ve value for a
cost.
Which is thecorrect value to use ?
Dave.
============================
Daniel Kastl wrote:On Wed, Jan 18, 2012 at 4:31 PM, Dave Potts <dave.potts@pinan.co.uk>
wrote:Ok the matter is addressed in
http://www.pgrouting.org/docs/howto/oneway.html
You just make the value for the cost to be very high, is there a given
value that should be used?Well, you can make it high that you can be sure that it will be longer
than
what could be a valid total length of a route.
And if your result will be longer than that, you can assume that it took
a
one-way street in the wrong direction, because probably there was no
other
way.Daniel
Dave Potts wrote:
>
>
> Hi
>
> Is there a way of saying the link between nodes A and B in a given
network
> is a one way connection?
>
> I had assume that setting the to_cost/reverse_cost would be the way
to
go,
> but I have not see this type of thing describe on any of the web
pages.
>
> regards
>
>
> Dave.
>
> --
>
>
> _______________________________________________
> Pgrouting-users mailing list
> Pgrouting-users@lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/pgrouting-users
>--
_______________________________________________
Pgrouting-users mailing list
Pgrouting-users@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/pgrouting-users--
Georepublic UG & Georepublic Japan
eMail: daniel.kastl@georepublic.de
Web: http://georepublic.de--
--
Dave,
I believe either can be used. Using a high value will allow you to traverse the oneway street in reverse if there is no other way to go rather than fail. Using -1 will eliminate the edge from the directed graph. Which you use depends on your use case and the type of analysis you are performing. In a general sense either should work.
Daniel - you have anything to add to this?
-Steve
On 1/24/2012 6:21 PM, Dave Potts wrote:
I am confused about the one way street issues.
The page http://www.pgrouting.org/docs/howto/oneway.html, says use a high
cost value eg 1000, but the page
http://www.pgrouting.org/docs/1.x/dijkstra.html says 'a negative cost will
prevent the edge from being inserted in the graph' ie use -ve value for a
cost.Which is thecorrect value to use ?
Dave.
============================
Daniel Kastl wrote:On Wed, Jan 18, 2012 at 4:31 PM, Dave Potts<dave.potts@pinan.co.uk>
wrote:Ok the matter is addressed in
http://www.pgrouting.org/docs/howto/oneway.html
You just make the value for the cost to be very high, is there a given
value that should be used?Well, you can make it high that you can be sure that it will be longer
than
what could be a valid total length of a route.
And if your result will be longer than that, you can assume that it took
a
one-way street in the wrong direction, because probably there was no
other
way.Daniel
Dave Potts wrote:
Hi
Is there a way of saying the link between nodes A and B in a given
network
is a one way connection?
I had assume that setting the to_cost/reverse_cost would be the way
to
go,but I have not see this type of thing describe on any of the web
pages.
regards
Dave.
--
_______________________________________________
Pgrouting-users mailing list
Pgrouting-users@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/pgrouting-users--
_______________________________________________
Pgrouting-users mailing list
Pgrouting-users@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/pgrouting-users--
Georepublic UG& Georepublic Japan
eMail: daniel.kastl@georepublic.de
Web: http://georepublic.de--