Advances in Spatial and Temporal Databases 12th International Symposium, SSTD 2011, Minneapolis, MN, USA, August 24-26, 2011, Proceedings - Pfoser, Dieter; Tao, Yufei; Mouratidis, Kyriakos; Nascimento, Mario A.; Mokbel, Mohamed; Shekhar, Shashi; Huang, Yan (Springer Berlin Heidelberg : Imprint: Springer, 2011)