[GRASS-user] Contour lines extraction

[Maciej Sieczka]

Odoardo Zecca napisa?(a):
> Hi all,
> I need to extract some contour lines from a vector map (imported with
> v.in.dwg -z). While  I can do this on the base of their category, it would
> be easier to directly select the desired elevations, but I don't know
> how to refer to them.

Maybe

add a x,y,z columns to your table (v.db.addcol)

populate it with coords (v.to.db option=coor)

now z coord is stored in table

?

Maciek