[GRASS-dev] v.extract centroids

GRASS GIS GRASS GIS developer
1

Hi,

re. rev 24328, "BugFix?: Do not extract centroids outside area"
  http://trac.osgeo.org/grass/changeset/24328

I don't think v.extract should be making those sorts of topological decisions. If that is wanted would 'v.extract type=area' do the trick?
if the option is for some reason wanted, then shelter it behind a flag?
or do I not understand the change properly and this is covering the type=area case?

Hamish

2

Hi Hamish,

2008/2/27, Hamish <hamish_b@yahoo.com>:

re. rev 24328, "BugFix?: Do not extract centroids outside area"
  http://trac.osgeo.org/grass/changeset/24328

I don't think v.extract should be making those sorts of topological decisions. If that is wanted would 'v.extract type=area' do the trick?
if the option is for some reason wanted, then shelter it behind a flag?
or do I not understand the change properly and this is covering the type=area case?

AFAIR it should fix type=area issue, a vector layer with one area and
one centroid outside

| Number of boundaries: 1 Number of faces: 0 |
| Number of centroids: 2 Number of kernels: 0 |

grass63 and grass630

$ v.extract in=earea out=earea1 type=boundary,centroid --o
Number of boundaries: 1
Number of centroids : 2

$ v.extract in=earea out=earea1 type=area --o
Number of boundaries: 1
Number of centroids : 1

grass62 gives
Number of boundaries: 1
Number of centroids : 2

Martin

--
Martin Landa <landa.martin gmail.com> * http://gama.fsv.cvut.cz/~landa *