When I create tracks from the overlay layer created by a shapefile, the tracks are often broken up into segments. If I want just one track from two segments, I have to be very careful of the order of the track I choose when I do the append. For example, I pick out two trails that are two segments of the same trail so track one goes from A to B and track two goes from B to C. When I do the append operation, I have to make sure I append track two to track one. If I append track one to track two, I get a jump from C to A so the single track will now go from B to C to A. It should be possible to determine the end points of the two tracks that are closest to each other and join the two tracks at that closest point.

Sam Chan
OCSD SRRU