title: spatial filtering by proximity in R
body: <p>I have occurrence points for a species, and I'd like to remove potential sampling bias (where some regions might have much greater density of points than others). One way to do this would be to maximize a subset of points that are no less than a certain distance X of each other. Essentially, I would prevent points from being too close to each other.</p>
  
  <p>Are there any existing R functions to do this? I've searched through various spatial packages, but haven't found anything, and can't figure out exactly how to implement this myself.</p>
  
  <p>An example occurrence point dataset can be downloaded <a href="https://dl.dropboxusercontent.com/u/34644229/occurenceRecord.zip" rel="nofollow">here</a>.</p>
  
  <p>Thanks!</p>