[GRASS-user] Re: Converting line-vector to closed polygon-bounderies

[Joop Goedbloed]

Joop Goedbloed wrote:

> Hello Grassteam
> Te create catchment boundaries (closed polygon boundaries) for use in  
> InfoWorks suwer-system
> I have an autocad file with buildings and streets containing lines.
>
> For conversion I have imported it in Grass (6.2.1. Linux)
> en use the folowing commands I do not know if it is the right sequens.
>
> 1... v.build.polylines (to make polygons from lines)
> 2... v.category ( to add a catogory)
> 3... v.type ( to change lines to boundaries)
> 4... v.centroids ( to add missing ventroids)
>
> It works fine but
>  1  there are some missing linesegments (thats OK need some handjob)
>   2  boundaries containing arc's are wrong (need some handjob)
>   3 some boundaries are "OK" but  it is not  possible to create areas.
> See attatchment  (gray boundaries and green node)
> what is going wrong  en what is the right command sequens  to create 
> areas.
>
> thanks
>
> Joop Goedbloed
>
>
> ------------------------------------------------------------------------
>
>