[GRASS-user] Re: [GRASSLIST:1175] add centroids automatically to area boundaries

[Markus Neteler]

On Thu, Aug 10, 2006 at 03:04:05PM +0200, Ulrich Leopold wrote:
> Dear list,
> 
> I am trying to solve the impossible it seems. I have the following
> problem:
> 
> I have a patched vector map with lines. These lines should be converted
> into area boundaries in order to receive areas. Once boundaries are
> retrieved I still need  to attach centroids to them in order to overlay
> with *another* vector map which already consists of boundaries and areas
> including centroids. How can I achieve this?
> 
> I tried to convert all lines into boundaries with
> v.type type=line,boundary
> 
> It seems to work as there are only boundaries left. Next step would be
> to add automatically centroids to these boundaries. How can this be
> done?

Hi,

see v.category for this. I have added a micro FAQ for this:
http://grass.gdf-hannover.de/wiki/Convert_vector_types

hope this helps,

 Markus