[GRASS-user] generate polygon from lines

[Hamish]

Craig Feuerherdt wrote:
> I have a vector layer that contains lines which define a polygon.
> I have attempted to build a polygon from the layer but have not had
> much luck.
...
> Number of nodes     :   238
> Number of primitives:   234
> Number of points    :   0
> Number of lines     :   234
> Number of boundaries:   0
> Number of centroids :   0
> Number of areas     :   -
> Number of isles     :   -


In GRASS-land boundaries + centroids make polygons, so convert lines to
boundaries with v.type and add centroids with "v.category option=add".

If it still doesn't work check with v.digit that all your nodes are
snapped (green "x"s instead of red ones).


Hamish