[GRASS-user] problem with v.patch

[Maciej Sieczka]

lami at faunalia.it wrote:
> Hi all,
> I tried to use v.clean with the follow tools: snap,break and rmdupl but
> the result is only a little better:
> 
> Topology was built.
> Number of nodes     :   1323
> Number of primitives:   1657
> Number of points    :   0
> Number of lines     :   0
> Number of boundaries:   1188
> Number of centroids :   469
> Number of areas     :   468
> Number of isles     :   138
> Number of incorrect boundaries   :   77
> Number of centroids outside area :   3
> Number of areas without centroid :   2
> 
> And if I increase the thresh (default=0) for rmdupl the result get worse.
> Is the only solution to edit it?

Well yes. And it's no bug in v.patch. If the 2 vectors are not
compatible in terms of geometry, v.patch is not any guilty that
patching them produces a non-topological vector.

Maciek