Querying geospatial data streams in SECONDO
Chengyang Zhang, Yan Qun Huang, Terry Griffin · 2009
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.