Additively Weighted Voronoi Diagrams for Optimal Sequenced Route Queries

The Optimal Sequenced Route (OSR) query strives to find a route of minimum length starting from a given source location and passing through a number of typed locations in a specific sequence imposed on the types of the locations. In this paper, we propose a precomputation approach to OSR query in vector spaces. We exploit the geometric properties of the solution space and theoretically prove its relation to Additively Weighted Voronoi diagrams. Our approach recursively accesses these diagrams to incrementally build the optimal sequenced route. Our experimental results verify that our pre-computation approach outperforms the previous index-based approaches in terms of query response time.