[pgrouting-users] Build the "right" direction in a network, from a fixed starting point

[Vicky Vergara]

Hi,
Maybe you want to see if all vertices are reachable from the starting (red)
point.
What I would do is a pgr_dijkstra(one to many) and verify which vertices
are not reachable and manually change the direction of the ones that are
not.
Vicky

On Wed, May 9, 2018 at 1:51 AM, andy <aborruso at gmail.com> wrote:

> Hi,
> I have a simple network like the one on the left side of the image below (
> https://i.imgur.com/4mHWfCz.png).
> The line directions of the left side are those I used to draw the lines.
>
> Choosing a starting point (in the image the red one), is there in
> pgrouting a way to assign/calculate the "right" direction of the network
> (the one I have on
> the right)?
> Imagine that this is an hidraulic network in a flat world and that I open
> a water faucet in the red point. I want to "correct" the directions
> highlighted in green on the right, and have the water direction.
>
> Thank you
>
> [image: immagine.png]
>
>
> --
> ___________________
>
> Andrea Borruso
> website: https://medium.com/tantotanto
> 38° 7' 48" N, 13° 21' 9" E, EPSG:4326
> ___________________
>
> "cercare e saper riconoscere chi e cosa,
>  in mezzo all’inferno, non è inferno,
> e farlo durare, e dargli spazio"
>
> Italo Calvino
>
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Vicky Vergara
Operations Research

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