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List:       postgis-users
Subject:    Re: [postgis-users] Routing
From:       Andrea Maschio <andrea.maschio () gmail ! com>
Date:       2008-01-29 8:54:32
Message-ID: 479EE9C8.3050700 () gmail ! com
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Thanks Daniel,

Daniel Kastl ha scritto:
> For routing with Dijkstra algorithm you only need a "valid" road 
> network with information about source (start) and target (end) of each 
> link. That's all, and you even don't need something like a geometry 
> column.
Ok, I understand what is a valid table, as it is a table "routable", 
this meaning that it is basically a list of branches with two fields 
indicating the two nodes. The question is: if I have a shape file (I 
assume it comes from a ArcGis environment) and who provided it claims it 
is topologically valid (btw I have two, one with nodes and one with 
branches), but I cannot see in the table generated from shp2pgsql any 
field (because actually in the shape file there isn't this information): 
is there a way to transform it into something readable from one of the 
shortest_path functions?


Thanks a lot

Andrea Maschio
http://wwwsuperandrew.it
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