1Date: 2002-10-23 2 3Dr. Mark Lake 4 5http://www.ucl.ac.uk/~tcrnmar/GIS/v.build.polylines.html 6 7v.build.polylines 8 9 10Description 11 12v.build.polylines builds polylines from the lines in a binary vector file. 13It outputs the polylines in either binary or ASCII vector format, and if 14requested, copies the attribute and category files from the original file. 15 16A line is a single straight line segment defined by one start node, one end 17node and no other nodes. A polyline is also defined by one start node, one 18end node and no other nodes, but is made of two or more consecutive straight 19line segments. The connections between the constituent line 20segments of a polyline do not appear as nodes in the vector map. 21 22Polylines provide the most appropriate representation of curved lines when 23it is important that nodes serve to define topology rather than geometry. 24Curved lines are usually digitized as polylines, but these are sometimes 25broken into their constituent straight line segments during conversion from 26one data format to another. v.build.polylines can be used to rebuild such 27broken polylines. 28 29 30Acknowledgements 31 32This program was written during the author's tenure of a Leverhulme Special 33Research Fellowhip. 34