I don't see any postgis functions for creating 3d lines. Is it safe to assume that you can do so by making a line with 3d points? Mark -- Have fun or die trying - but try not to actually die. http://www.AboveCalifornia.com Got Mac OS X? Get the AboveCalifornia Sherlock Channel: sherlock://www.AboveCalifornia.com/sherlock/SherlockChannel.xml?action=add