1. 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

2. 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

3. From Point Observations to Moving Regions
CRI Group Meeting

4. 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

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

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

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

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

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

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

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

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

13. Questions?
06/26/08
CRI Group Meeting 13