[GRASS-user] Contour lines extraction

[Odoardo Zecca]

On 7/21/06, Odoardo Zecca <odoardo.zecca at gmail.com> wrote:
>
> Thank you Maciej.
>
> It seem to work only for points, but not for lines. Maybe this doesn't
> work for lines because they don't have a unique x and y but only a unique z,
> or am I doing something wrong?
>

OK!  the  right option is  'start'  (or  'end'):

  v.db.addcol map=cl6361 layer=1 "columns=x double precision,y double
precision,z double precision"

 v.to.db map=cl6361 type=line layer=1 qlayer=1 units=meters option=start
column=x,y,z

Thank you very much, Maciej, this is an important step for may work!
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