Thank you Maciej.<br><br>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?<br><br><div><span class="gmail_quote">
On 7/20/06, <b class="gmail_sendername">Maciej Sieczka</b> <<a href="mailto:tutey@o2.pl">tutey@o2.pl</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Odoardo Zecca napisa?(a):<br>> Hi all,<br>> I need to extract some contour lines from a vector map (imported with<br>> v.in.dwg -z). While I can do this on the base of their category, it would<br>> be easier to directly select the desired elevations, but I don't know
<br>> how to refer to them.<br><br>Maybe<br><br>add a x,y,z columns to your table (v.db.addcol)<br><br>populate it with coords (v.to.db option=coor)<br><br>now z coord is stored in table<br><br>?<br><br>Maciek<br></blockquote>
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