[GRASS-user] to separate a polygon

[Vincent Bain]

AFAIU :
* your network was digitized as a single polygon, contouring
streets/roads and crossroads in one go ;
* you would like to turn it into a linear reference network.
Am I right ?
If no special splitting was initially performed on boundaries to
distinguish between connected street sections I fear you'll have to do
things manually...

Vincent


Le mardi 09 février 2010 à 16:03 +0100, Yvan Paillé a écrit :
> My road network was digitized into a polygon. Initially, I need to 
> separate into two distinct parts by half. In a second time, I need to 
> cut each polygon based on the streets and of belonging to adjacent 
> parcels. As if I would define a sidewalk.
> 
> Only the first step is already causing me problems.
> 
> Thank you
> 
> Yvan
> 
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> Vincent Bain a écrit :
> > Yvan,
> > could you please state your intention ? and clarify how your network is
> > represented : are roads delimited by polygon boundaries and crossroads
> > by nodes ? or was the network digitized as a polygon (I mean giving
> > roads thickness) ?
> > 
> > First, about data type conversion, you can have a look at v.type.
> > 
> > Yours,
> > Vincent.
> > 
> > 
> > Le mardi 09 février 2010 à 15:14 +0100, Yvan Paillé a écrit :
> >> Hello,
> >> I would like to separate a polygon that represents a road network into 
> >> several polygons or polylines. I do not know what functions to use to 
> >> display vertices and nodes.
> >> Thank you in advance for answers that guide me.
> >>
> >> Yvan
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> 
>