[GRASS-dev] v.generalize

[Daniel Bundala]

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 <cavallini at faunalia.it> wrote:
>
> On Tue, 03 Nov 2009 11:59:34 +0100, Paolo Cavallini <cavallini at faunalia.it>
> 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=south1 at 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
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