[GRASS-user] problem with v.proj building topology

Markus Neteler neteler at osgeo.org
Sun Dec 5 14:50:27 EST 2010

Hi Margherita,

On Sat, Dec 4, 2010 at 8:18 PM, Margherita Di Leo <diregola at gmail.com> wrote:
> Hi List,
> I have a problem using v.proj. In in the destination location the vector map
> is incomplete, it seems that the topology is not completely built. In
> particular, there are missing polygons. The command line:
> v.proj input=suolo_paes_ext location=UTM_32_ED50 mapset=mimmo
> output=suolo_paes_ext --o
> gives the following WARNING:
> Building topology for vector map <suolo_paes_ext>...
> Registering primitives...
> 5305 primitives registered
> 26646 vertices registered
> Building areas...
> WARNING: Area of size = 0.0 ignored
> WARNING: Area of size = 0.0 ignored

You are reprojecting from UTM_32_ED50 into ...?

> I also tried to use v.build after that, without results.

In any case, you may need to clean up the topology *before* running v.proj.
Perhaps the original map isn't clean.


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