Time-parameterized queries in spatio-temporal databases

Time-parameterized queries (TP queries for short) retrieve (i) the actual result at the time that the query is issued, (ii) the validity period of the result given the current motion of the query and the database objects, and (iii) the change that causes the expiration of the result. Due to the highly dynamic nature of several spatiotemporal applications, TP queries are important both as standalone methods, as well as building blocks of more complex operations. However, little work has been done towards their efficient processing. In this paper, we propose a general framework that covers time-parameterized variations of the most common spatial queries, namely window queries, k-nearest neighbors and spatial joins. In particular, each of these TP queries is reduced to nearest neighbor search where the distance functions are defined according to the query type. This reduction allows the application and extension of well-known branch and bound techniques to the current problem. The propos...

• Type: Conference
• Year: 2002
• Where: SIGMOD
• Authors: Yufei Tao, Dimitris Papadias
• Keywords: Common Spatial Queries, Database, Neighbor Queries, SIGMOD 2002, TP Queries