removing duplicate vectors

[Dave Gerdes]

> A small program to remove duplicate vectors in a binary
> vector file is available via anonymous ftp at
> 	pasture.ecn.purdue.edu:/pub/mccauley/grass/v.rmdup.tar.Z
> 
> It should be considered pre-alpha, but it works on my test files.
> So far, it only removes vectors that are exact duplicates
> (all points are the same within threshold, within IEEE "wobbling 
> precision" tolerance. see iszero(3)), but in the future
> I hope to add a threshold option which will increase this
> the tolerance to remove "similar" vectors.
> 
> Use at your own risk (read the man page on g.copy first).
> 
> --Darrell McCauley
> 

For the record v.spag also does that.  4.0 had a rather nasty bug
in it, but in 4.1 it has been fixed and a -i option has been
added to tell it to just do that one function.

Now if you get the 'similar' feature working, lemme know. I can
come up with a bunch of cases to test it on.


-- 



  Dave Gerdes
  US Army Construction Engineering Research Lab
  Spatial Analysis & Systems Team
  dpgerdes at zorro.cecer.army.mil
  (217) 352-6511 x591