Ontology-based Information Visualizationby Christiaan Fluit, Marta Sabou, and Frank van Hermelen

ITCS6050 presentation by Roman Pyzh

Agenda

What Is Spectacle?Ontologies Used In Spectacle

Cluster Map: BasicsCluster Map: User Interactions

Case Study: Single PerspectiveCase Study: Common OntologyCase Study: Multi-Perspective Query

Uses of Onotology-Based Visualization

Related and Future Work

Summary and Q&A

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.

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

Cluster Map: Basics

Cluster Map: User Interactions

Case Study: Single Perspective

Case Study: Single Perspective (cont.)

Case Study: Common Ontology

Case Study: Common Ontology

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

Summary and Q&A