Hello Paolo, Try v.build.polylines. This was discussed couple of times before. So you might want to have a look at some older discussions.
Daniel On Tue, Nov 3, 2009 at 11:07 AM, Paolo Cavallini <[email protected]> wrote: > > On Tue, 03 Nov 2009 11:59:34 +0100, Paolo Cavallini <[email protected]> > wrote: >> Hi all. >> I'm studying v.generalize; in the past I obtained good results, but now I >> keep on getting either 100% or 0% of the original vertices, no matter of >> which algorhitm and parameters I select: could this be a bug, or am I > doing >> something wrong? >> Testing on debian testing, grass64-5 from deb unstable, through qgis >> interface. >> Thanks. > > E.g.: > v.generalize input=sou...@butta type=area layer=1 method=douglas_reduction > threshold=1000.0 look_ahead=7 reduction=50 slide=0.5 angle_thresh=3 > degree_thresh=0 closeness_thresh=0 betweeness_thresh=0 alpha=5 beta=5 > iterations=1 layer=1 output=snake_simpl > Generalization (douglas_reduction)... > Building topology for vector map <snake_simpl>... > Registering primitives... > 1000 > 1488 primitives registered > 31776 vertices registered > Building areas... > 713 areas built > 618 isles built > Attaching islands... > Attaching centroids... > Number of nodes: 1393 > Number of primitives: 1488 > Number of points: 0 > Number of lines: 0 > Number of boundaries: 775 > Number of centroids: 713 > Number of areas: 713 > Number of isles: 618 > Number of vertices was reduced from 31776 to 31776 [100%] > > Finalizado com sucesso > > -- > http://faunalia.it/pc > _______________________________________________ > grass-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-dev > _______________________________________________ grass-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-dev
