Terracost: Computing least-cost-path surfaces for massive grid terrains.

Thomas Hazel Laura Toma Jan Vahrenhold Rajiv Wickremesinghe Terracost: Computing least-cost-path surfaces for massive grid terrains. 2008 12 ACM Journal of Experimental Algorithmics http://doi.acm.org/10.1145/1227161.1370600 db/journals/jea/jea12.html#HazelTVW08