[GRASS-user] vector data - convert lines/intersections into areas?

[Maciej Sieczka]

Kurt Heston wrote:

> The CAD designer that
> generated these DXF files used horizontal and vertical lines to create
> large grids.  Visually, the lines form a multitude of squares and
> rectangles, but the intersections are not defined at the vector level. 
> That is, they were not drawn as closed polygons, so v.in.dxf doesn't
> yield any areas.
> 
> I'd like each of the "polygons" created by the grid lines to become a
> vector area, but haven't yet found a clever way to do it.  For now, I'm
> simply creating a raster with the vector data, pulling it back in with
> r.in.gdal and subsequently using "r.to.vect feature=area" to find the
> closed polygons.
> 
> Is there a way that I can go about this purely within the vector space?

v.type type=line,boundary
v.clean tool=bpol (or maybe tool=break?)
v.centroids

Maciek