Title :
Navigating through hierarchical change propagation in spatiotemporal queries
Author :
Mountrakis, Giorgos ; Agouris, Peggy ; Stefanidis, Anthony
Author_Institution :
Nat. Center for Geogr. Inf. & Anal., Maine Univ., Orono, ME, USA
Abstract :
In spatiotemporal applications, meaningful changes vary according to object type, level of detail, and nature of application. We introduce a dynamic classification scheme and its interaction with a spatiotemporal model, to describe change propagation in spatiotemporal queries. Our classification is based on identifying three levels of change, ranging from simple verification of the continuous existence of an entity to the identification of change and the detailed description of this change. In order to provide a transformation function between these levels, we introduce a tree-based hierarchy in the spatial and temporal domains. This hierarchy is dynamic and continuously updated as new information arrives. The user has the flexibility to navigate through different resolution representations by manipulating two functions, the minimum spatial element and the minimum temporal element. In the temporal domain, queries are further more decoded as point-based and interval-based. In doing so we address the problem of time continuity within a spatiotemporal query context
Keywords :
database theory; query processing; temporal databases; tree data structures; visual databases; dynamic classification scheme; hierarchical change propagation; interval-based query; minimum spatial element; minimum temporal element; point-based query; spatial database; spatiotemporal queries; temporal database; tree-based hierarchy; Context; Decoding; Electrical capacitance tomography; Information analysis; Monitoring; Navigation; Query processing; Spatial databases; Spatial resolution; Spatiotemporal phenomena;
Conference_Titel :
Temporal Representation and Reasoning, 2000. TIME 2000. Proceedings. Seventh International Workshop on
Conference_Location :
Cape Breton, NS
Print_ISBN :
0-7695-0756-5
DOI :
10.1109/TIME.2000.856593