Chengyang Zhang Computer Science Department University of North Texas

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Presentation transcript:

Chengyang Zhang Computer Science Department University of North Texas Aggregating and Querying Geo-Streams: From static sensors to Evolving Phenomena Chengyang Zhang Computer Science Department University of North Texas

Geo-Stream Refers to data emitted by geo-referenced sensors and sensor networks, such as water level, vehicle speed Queries are often interested in moving/evolving phenomena, such as flood, traffic jam Need to bridge the gap between the point observations and continuous phenomena in REAL time. 06/26/08 CRI Group Meeting 2

From Point Observations to Moving Regions CRI Group Meeting

Challenges Supporting spatio-temporal stream data types Allow geo-streams to be grouped according to spatial proximity and then elevated into streaming regions Query Processing and Optimization CRI Group Meeting

1. Stream Data Types CRI Group Meeting SMU Talk March 26, 2008 5

2. Generalize Aggregate Functions CRI Group Meeting SMU Talk March 26, 2008 6

Generalize Aggregate Functions CRI Group Meeting SMU Talk March 26, 2008 7

3. Query Optimization CRI Group Meeting SMU Talk March 26, 2008 8

Semantics-based Optimization CRI Group Meeting SMU Talk March 26, 2008 9

Incremental Optimization CRI Group Meeting SMU Talk March 26, 2008 10

Experimental Results CRI Group Meeting SMU Talk March 26, 2008 11

Experimental Results CRI Group Meeting SMU Talk March 26, 2008 12

Questions? 06/26/08 CRI Group Meeting 13