On Mon, Mar 8, 2010 at 19:07, Rich Shepard <rshep...@appl-ecosys.com> wrote: > Wolf, > > What you show above is the same two points on both lines. I changed the > file 'nodes' to read: > > 1|242856.60|431305.07 > 2|242551.88|432149.70
Hi Rich, Now you are mixing with the format for v.in.ascii. The v.net.path fomat is: id start_point_x start_point_y end_point_x end_point_y where id is a number, then comes the x and y coordinate points for the starting point and then comes the x and y coordinate pair for the end point. All fields are separated by a single space. Hope this helps! The id will become the cat of the new shortest path. So if you specify multiple lines toy will get multiple paths For a trivial example you might have (the coordinates are going to be different in your map) 1 11.22 43.22 32.12 45.21 Which will find the shortest path from point (11.22, 43.22) to point (32.12, 45.21) along your stream network. This single line will be stored in the output map (stream_length in your case). Now you can use v.to.db. to query the length of this (or all if you have multiple paths) like this: v.to.db -p map=stream_length option=length type=line Add units=k for length in km. See the manual pages for more info: http://grass.osgeo.org/grass65/manuals/html65_user/v.net.path.html http://grass.osgeo.org/grass65/manuals/html65_user/v.to.db.html Hope this helps, Wolf _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user