[GRASS-user] merging 2 line segments in a vector

[Stephan Holl]

Hello Michael, 

On Sun, 11 Jun 2006 21:47:48 +0200 Michael Fecht
<Michael.Fecht at uibk.ac.at> wrote:

> > Copy the original table (db.copy) and connect the copied one with
> > v.build.polylines output (v.db.connect).
> >
> Sounds good but did not work. Probably because all features in my
> v.build.polylines output have the category number 0. But there is no
> cat 0 in the original table. So a connection with v.db.connect
> "fails".

You cold try to build new categories using v.category and then upload
the new cats into a new table.

v.category
v.db.addtable
v.to.db op=cat

Perhaps this is a solution for you?

Best
	Stephan


-- 
GDF Hannover - Solutions for spatial data analysis and remote sensing
Hannover Office      -     Mengendamm 16d      -     D-30177 Hannover
Internet: www.gdf-hannover.de      -      Email: holl at gdf-hannover.de
Phone : ++49-(0)511.39088507       -        Fax: ++49-(0)511.39088508