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I'm trying to simplify my shapefile, which uses a lot of vertices to represent curvatures, by using the Generalizer plugin. But no matter what threshold I use for Douglas algorithm, it still includes almost all of those closely placed vertices, which I can see are less than 1 feet away from each other. Any hints of what I'm doing wrong?

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There is nothing the algorithm could simplify. In the test data you provided, one road/curve is modeled using multiple very short links which - by themselves - are mostly just short straight lines.

  • My bad; didn't expect it to be like that. Do you know any methods to merge those tiny links together automatically? I was thinking of doing it based on node degree(much like the second answer here:stackoverflow.com/questions/17735252/…), but it messed up a lot of other features – Alex Sep 21 '14 at 16:54
  • Best ask the merge question separately. It requires topology-aware tools. I currently can't think of a good solution off the top of my head. – underdark Sep 21 '14 at 17:05

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