[GRASS-user] Extracting non-overlapping lines

Dwight Needels needels at translucida.com
Fri Jul 24 12:15:19 EDT 2009

Hi all,

Does anybody have a suggestion for subtracting the elements in one  
line vector from another line vector?


On Jul 21, 2009, at 7:06 PM, Dwight Needels wrote:

> Hi all,
> I have two nearly identical line vectors, and I would like to  
> extract the lines that differ between the two vectors into a third  
> vector. Specifically, I want to isolate the connecting lines that  
> were generated by v.net operation=connect. Something like:
> [map_C = map_A   NOT   map_B]  for line features.
> I thought I would be able to use v.overlay with operator=not, but it  
> it appears to require that btype=area. It also appears that v.select  
> allows only operator=overlap.
> Can someone point me in the right direction?
> I am using William Kyngesburye's 6.4.0RC3 on MacOS 10.5.7.
> Thanks,
> -Dwight
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