I'm not pretending it will work easily, but I seem to recall that in 
ARC/INFO you can digitize a center-line between the edges of a road or 
stream in ArcEdit. So the thing to do would be to write an AML that takes 
the vertices of your streams as input to generate center-lines. It is 
however three years ago that I worked with ARC on a regular basis, so I 
can't offer you any specific details. Hope this gives you a clue!

Philip Verhagen
-- 


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