[GRASS-user] r.to.vect and then v.clean using tool=rmarea createspolygonsinstead of holes.

[Markus Neteler]

On Fri, Dec 12, 2008 at 9:01 PM, Moskovitz, Bob
<Bob.Moskovitz at conservation.ca.gov> wrote:
> So, what would cause r.to.vect to create areas without centroids?

I have tried r.to.vect with a Spearfish map and it looks ok:

g.region rast=trn.sites
d.mon x0
d.rast trn.sites

r.to.vect trn.sites out=trn feature=area
Extracting areas...
 100%
 100%
Building topology for vector map <trn>...
Registering primitives...
74 primitives registered
903 vertices registered
Building areas...
 100%
20 areas built
2 isles built
Attaching islands...
 100%
Attaching centroids...
 100%
Number of nodes: 56
Number of primitives: 74
Number of points: 0
Number of lines: 0
Number of boundaries: 54
Number of centroids: 20
Number of areas: 20
Number of isles: 2
r.to.vect complete.


d.vect trn

d.vect trn disp=topo

v.out.ascii trn format=standard
-> boundaries and centroids

May a potential problem in r.to.vect depend on the shape or the
boundary lengths? Obviously, a reproducible example is desired.

Markus