[pgrouting-users] driving_distance function nodes returned ok edges incomplete

[Daniel Kastl]

Driving distance only returns valid nodes.
The edge column is there to make the output look the same as the other
functions ... we can discuss this is a good idea or not.
Sorry for the confusion. Maybe this should be written somewhere more
clearly.

Daniel


2011/3/23 Sandor Csaba <sandor.csaba at viamap.hu>

> Hi List,
>
> I'm trying to figure out how the driving_distance function works.
>
> Here's my sql:
>
> SELECT * FROM driving_distance('SELECT id::int4,f_junc::int4 AS
> source,t_junc::int4 AS
> target,ST_Length(ST_Transform(the_geom,23700))::float8 AS cost FROM
> omsz_network',3094421,22500,false,false);
>
> The nodes in the given distance are returned correctly, but in case of
> edges some of them are returned, some other not.
>
> See attached image:
> Red dot is the starting point,
> black dots are nodes returned by the function.
> Red lines are the edges returned.
> Blue lines are all the street network.
>
> What am I doing wrong that not all the edges are returned in the
> driving distance?
>
> Thank you,
> Csaba
>
> --
> Sándor Csaba
> szolgáltatási vezető
> ViaMap Kft.
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>
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>
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-- 
Georepublic UG & Georepublic Japan
eMail: daniel.kastl at georepublic.de
Web: http://georepublic.de
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