Querying geospatial data streams in SECONDO

Authors:
Chengyang Zhang;Yan Huang;Terry Griffin
Affiliations:
University of North Texas;University of North Texas;Midwestern State University
Venue:
Proceedings of the 17th ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems
Year:
2009

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Abstract

In this demo paper, we report our experience of designing and implementing a geospatial data stream query engine in SECONDO. Compared with current data stream and moving object query systems, our query engine not only supports point geo-streams that represent continuously moving points, but also line and region geo-streams that represent complex spatio-temporal phenomena elevated from geo-referenced raw readings. We implement the data types, operators, and language extensions as a modular algebra in SECONDO. We also provide an independent SQL parser for specifying continuous queries using SQL-like syntax as well as an Ajax-driven web interface for dynamic visualization of steaming results.