[GRASS-user] v.lrs.create with routes that "double back"

Micha Silver micha at arava.co.il
Thu Jun 12 06:14:39 EDT 2008

I'm using the v.lrs.create module to make a table of distances between 
mileposts along some trails. Some of the trails "double back" on 
themselves. i.e - a circular route in which the last few kilometers or 
so overlap the first kilometers and ends at the starting point. So I 
might have a situation where milepost 19 is identical to milepost 3, and 
mp 20 = mp 2, and mp 21 = mp 1.

The module fails in these cases (start_mp > = end_mp). Is there any way 
to work around this? Up till now, I've deleted the last few 
(overlapping) mileposts, then the module works fine. But I then have to 
add the final few distances by hand.

Is there any way to work around this?


Micha Silver
Arava Development Co

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