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

[Markus Neteler]

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.

Markus