... queries in [10].This is a low level definition. In contrast, our definition of moving queries is at end-user level, which includes the notion of a focal object. Second, the work done in [10]indexes ... approaches in query processing formoving object trajectories. In VLDB, 2000.S. Prabhakar, Y. Xia, D. V. Kalashnikov, W. G. Aref, and S. E. Hambrusch. Query indexingand velocity constrained indexing: ... or data mining problems.1IntroductionClustering is a vital process for condensing and summarizing information, since it canprovide a synopsis of the stored data. Although there has been much...