[GRASS-user] Converting polygons to lines

[Jarek Jasiewicz]

Well, if roads are polygons it colud be a problem.

if you don't need atributes of roads I sugest to convert polygons to 
raster, run r.thin, and convert raster to lines. But in that way you 
will lost road attributes.



supunmali pisze:
> I need to convert a road network in polygons to lines to do a network analysis.
> I converted polygons to line by using v.type.bl- converting boundaries to lines. Then instead of getting single lines, i'm getting border lines over the polygon that was there earlier (No polygon its now line data). I tried cleaning options in GRASS but it didnt work.
> Please provide me with guidelines on how to convert it to line data enabling to do network analysis.
>
> Thanks
>