[GRASS-user] specify tunnel/bridge in roadmap

[MS]

If the bridge and tunnel are valid route options, can you remove the  
node and make them topologically incorrect?   Meaning, crossing lines  
with no node intersection so there is no option to turn.  I'm not sure  
if module needs topologically correct lines/network.

Alternatively, if the bridge or tunnel is not a valid route, can you  
break the network connection by creating a gap in the line/network for  
either the bridge or tunnel so one route is not an option?

Mark

On Apr 29, 2010, at 3:51 PM, Robbie Heremans  
<robbie.heremans at gmail.com> wrote:

> Dear,
>
> In order to perform (shortest path) network analysis, how can I  
> specify that
> the crossing of 2 lines in a roadmap is not an intersection but a  
> tunnel/bridge
> (impossible to turn left or right)?
>
> Is v.digit the right way to do this (deleting en changing lines/ 
> vertices)?
>
> Robbie
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