[GRASS-user] extract the boundary

GRASS GRASS user
1

Hi:
I have a raster image which contains some polygons,and now I want to extract the boundary of them and change the boundary to vector, how to do that?

2

On Tue, Mar 23, 2010 at 3:00 PM, maven apache <apachemaven0@gmail.com> wrote:

Hi:
I have a raster image which contains some polygons,and now I want to extract
the boundary of them and change the boundary to vector, how to do that?

I think that r.to.vect (f=area) and then a v.type will do that job.

Markus