[GRASS-user] Number of centroids outside area: difficulty with cleaning

[Markus Neteler]

On Sun, Apr 14, 2013 at 1:06 PM, Markus Metz
<markus.metz.giswork at gmail.com> wrote:
> On Sun, Apr 14, 2013 at 11:02 AM, RichardC <richtcooper at hotmail.com> wrote:
> > I'm trying to remove a 'Number of centroids outside area' after
> > re-projecting a file.
> >
> > I've tried v.clean with various tools. including breaklines/boundaries,
> > break polygons, snap lines/boundaries.
> >
> > The intial imported shapefile did not display any errors, but the following
> > errors appeared on re-projecting the latter file:
...
> The reason for these problems is one step earlier. Try to densify the
> vector boundaries with v.split, optionally followed by
> v.build.polylines before reprojecting it. See [0] for an example of
> the effect on reprojection.
>
> Markus M
>
> [0] http://trac.osgeo.org/grass/attachment/ticket/1918/dense_points_effect.png

This would be a nice addition for:

http://grasswiki.osgeo.org/wiki/Vector_topology_cleaning

markusN