Hi, 2010/10/20 Markus Metz <[email protected]>: > v.build.polyline works as follows: > it picks a line and from its start node, walks back as long as exactly > one other line is connected to this node. Line directions are reversed > as required, i.e. it does not matter if the next line is connected to > the current node by its start or end node. > > Once the start line of a polyline is identified, it walks forward and > adds all vertices (in reverse order if needed) of connected lines to > the start line, i.e. the start line and connecting lines are reversed > as needed. That is, if a line is reversed depends on what node is > initially picked for building polylines. > > If the direction of lines is important (it's not for boundaries to > build areas), you have to manually change line directions with either > v.edit or the wxdigitizer or the tool by Maris.
I took a liberty to add your useful notes to v.build.polylines manual - r43979. Martin -- Martin Landa <landa.martin gmail.com> * http://geo.fsv.cvut.cz/~landa _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
