[GRASSLIST:3035] Re: v.extract without centroids

[Radim Blazek]

On Friday 26 March 2004 13:47, Otto Dassau wrote:
> Radim Blazek schrieb:
> > On Thursday 25 March 2004 13:36, Otto Dassau wrote:
> > > Dear list,
> > >
> > > I have two questions:
> > >
> > > 1) I imported an area shape with 6000 polygons in g57 and
> > > there are 2 centroids missing. How can I find these two
> > > centroids?
> >
> > I believe that those 2 areas without centroids are slivers between
> > shape polygons.
> >
> > > 2) I used v.extract on this shape (with the 2 missing centroids).
> > > v.extract in=SHAPE out=SHAPE2 type=area where='AREAQM>1'.
> >
> > Try type=area,centroid. This is not correct and it should be fixed,
> > type=area must export also centroids.
>
> Hi Radim,
>
> thank you for your hint:
>
> I used:
> v.extract in=SHAPE out=SHAPE2 type=area,centroid where='AREAQM>1'.
>
> it exports areas _and_ the centroids, but now _all_ areas,
> although I just want to export areas > 1 with centroid.
>
> Number of nodes     :   6765
> Number of primitives:   7692
> Number of points    :   0
> Number of lines     :   0
> Number of boundaries:   7529
> Number of centroids :   163
> Number of areas     :   2300 -> should be 163 !
> Number of isles     :   1373
> Number of areas without centroid :   2137
>
> What can be done to solve this?

No idea, for me it works.

Radim