[pgrouting-users] Get the edges in correct order

ancaag04 at alumnos.unex.es ancaag04 at alumnos.unex.es
Wed Sep 7 23:35:00 EDT 2011

Hello Steve, I know the discussion, but the problem is different.
For example, this image [1] shows a part of the city. I have marked the start and
end edges.

Now I have this query:

SELECT gid, AsText(the_geom) AS the_geom
        FROM shootingstar_sp('ways', 552, 1096, 0.1, 'length', true, true);

This image [2] shows the results.

[1] http://img828.imageshack.us/img828/7915/segments.png
[2] http://img215.imageshack.us/img215/5103/resultsi.png

I'm doing something wrong?
Thank you.


> On 8/31/2011 11:28 PM, ancaag04 at alumnos.unex.es wrote:
>> Hello, i'm using A-star like this:
>> SELECT gid, AsText(the_geom) AS the_geom
>> FROM astar_sp_delta('ways', 2124, 2168, 0.1);
>> The path is correct but sometimes I don't get the edges in the correct order.
>> Is this normal?
> I think the edges are always in the correct order, but some times the
> edge is reversed from the direction that you traverse it on the route.
> This has been discussed in the past and I have posted an algorithm to
> correct that, but I do not have a link to it handy.
> -Steve
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