A Grid-Based Approximation Algorithm for the Minimum Weight Triangulation Problem
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Given a set of n points on a plane, in the Minimum Weight Triangulation problem, we wish to find a triangulation that minimizes the sum of Euclidean length of its edges. This incredibly challenging problem has been studied for more than four decades and has been only recently shown to be NP-Hard. In this paper we present a novel polynomial-time algorithm that computes a 14-approximation of the minimum weight triangulation -- a constant that is significantly smaller than what has been previously known. In our algorithm, we use grids to partition the edges into levels where shorter edges appear at smaller levels and edges with similar lengths appear at the same level. We then triangulate the point set incrementally by introducing edges in increasing order of their levels. We introduce the edges of any level i+1 in two steps. In the first step, we add edges using a variant of the well-known ring heuristic to generate a partial triangulation Â_i. In the second step, we greedily add non-intersecting level i+1 edges to Â_i in increasing order of their length and obtain a partial triangulation A_ i+1. The ring heuristic is known to yield only an O( n)-approximation even for a convex polygon and the greedy heuristic achieves only a Θ(√(n))-approximation. Therefore, it is surprising that their combination leads to an improved approximation ratio of 14. For the proof, we identify several useful properties of Â_i and combine it with a new Euler characteristic based technique to show that Â_i has more edges than T_i; here T_i is the partial triangulation consisting of level < i edges of some minimum weight triangulation. We then use a simple greedy stays ahead proof strategy to bound the approximation ratio.
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