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

[Margherita Di Leo]

Hi Markus,

Thanks for answering. I solved using:

ogr2ogr -s_srs EPSG:23032 -t_srs EPSG:32632 repr_suolo_paes.shp
suolo_paes_ext.shp

and imported the reprojected map with v.in.ogr. All polygons are reprojected
now.
But I noticed that using v.proj the map was reprojected with an important
error .I have another map of the same area, when I try to overlay them they
are in two different places, very far apart. But when I overlay the map
reprojected with ogr, everythings looks OK.
Couldn't it be a bug of v.proj? Has anyone had a similar problem using
v.proj?

Thank you

Margherita


2010/12/5 Markus Neteler <neteler at osgeo.org>

> 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
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.osgeo.org/pipermail/grass-user/attachments/20101206/3056e657/attachment.html