1. Avencia10 March 2004 Analysis Cubes: Building a Spatial OLAP Engine for Analyzing Crime Steve Meyer Robert Cheetham

2. Avencia10 March 2004 Overview OLAP = Online Analytical Processing Sits on top of transactional database Aggregates information to higher level of abstraction Help to ask complex summary questions Summarizes data into dimensions Most dimensions have hierarchy (year, month, day hour) or groups (robberies w/ a gun) Data structure is often called a cube, but isnt limited to 3D Designer creates measures (28-day moving average) Important foundation for data mining Add-on for most major RDBMS vendors

3. Avencia10 March 2004 Cube

4. Avencia10 March 2004 Cube

5. Avencia10 March 2004 Aggregations

6. Avencia10 March 2004 Processing Speed

7. Avencia10 March 2004 Dimensions

8. Avencia10 March 2004 Queries Q. How many 300-Series Crimes in District 5 in March were responded to by Patrol Car?

9. Avencia10 March 2004 Hierarchies

10. Avencia10 March 2004 Metrics

11. Avencia10 March 2004 Application 1

12. Avencia10 March 2004 Application 2

13. Avencia10 March 2004 Application 2

14. Avencia10 March 2004 Analysis Cubes: Building a Spatial OLAP Engine for Analyzing Crime Steve Meyer semeyer@avencia.com Robert Cheetham cheetham@avencia.com http://www.avencia.com/