1. Ontology-based Information Visualization by Christiaan Fluit, Marta Sabou, and Frank van Hermelen ITCS6050 presentation by Roman Pyzh

2. Agenda What Is Spectacle? Ontologies Used In Spectacle Cluster Map: Basics Cluster Map: User Interactions Case Study: Single Perspective Case Study: Common Ontology Case Study: Multi-Perspective Query Uses of Onotology-Based Visualization Related and Future Work Summary and Q&A

3. What is Spectacle? –Spectacle is an information exploration tool that enables users to create problem/query-specific information presentations. The core idea of Spectacle is to leverage semantics of the data accessed. –Two ways Spectacle provides information structured in the right way: –1. Hypertext interfaces – usual benefits of a website. –2. Graphical visualization - novel insights into information.

4. Ontologies in Spectacle –Spectacle builds on taxonomies, i.e., light-weight ontologies that describe a domain through a set of classes and their hierarchical relationships. –Key concepts in taxonomies: – - specialization relationship is encoded in the hierarchy – - the set of subclasses of a class incomplete when their union does not contain all the objects of the superclass – - classes that share instances are overlapping if no specialization relationship holds between them

5. Cluster Map: Basics

6. Cluster Map: User Interactions

7. Case Study: Single Perspective

8. Case Study: Single Perspective (cont.)

9. Case Study: Common Ontology

11. Uses of Ontology-Based Visualization –Analysis: –- single domain –- comparison of different data sets –- monitoring –Querying: –- query formulation –- initiation of action –- review of results –- refinement –Navigation

12. Summary and Q&A