What's the algorithm for mapping between locations and names? If I wanted to integrate this into my own code how would I do that -- is there a library?

Coincidentally I published a post about almost exactly the same thing only a few hours ago, http://h14s.p5r.org/2014/09/z-quads-strings.html. But it focuses more on the algorithmic side which is why I'm curious about the mechanics of UBIs.