[postgis-users] OpenStreetMap + osm2pgsql + pgRouting into Postgis

Maria Arias de Reyna marias at emergya.es
Wed May 19 04:21:20 PDT 2010

El Wednesday 19 May 2010, roshni.spain escribió:
> Hi,
> how can i be sure about this? If i get wrong results i mean ...

Well, you can try some samples and check it by hand.

If I am not mistaken, that number is used to know the size of the buffer used 
to calculate which node goes to each vertex. 

If you use a small number and the lines you are using are not close enough, 
pgrouting will think they are not touching and will not assign them the same 

If you use a big number, pgrouting can think that lines, who should not be 
touching, are touching. Then it can lead you to stupid routes, like jumping 
from one road to the paralell.

María Arias de Reyna Domínguez
Área de Operaciones

Emergya Consultoría 
Tfno: +34 954 51 75 77 / +34 607 43 74 27
Fax: +34 954 51 64 73 

More information about the postgis-users mailing list