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Post on 21-Dec-2015
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Challenges in Visualizing Knowledge and Metadata
Jennifer Golbeck
VIKE 2003
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Unique Challenges in Knowledge Engineering
• Scale– Size of individual ontologies– On the Semantic Web - Size of the entire RDF
graph when external concepts are linked in
• Interconnectedness– Usually no simple hierarchy or strongly
disjointed graphs
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Two Fronts of Visualization
• Large Graphs– Understand structural properties of the data
• Hierarchies– Using the hierarchy as a base, display well
organized semantic graphs
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Graphs
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Currency
• Three letter currency codes as defined by ISO 4217.
• Visualization shows that, as expected from the ontology, most items are individual currencies and their data. However, visualization also shows centralized collection of terms
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Space Shuttle
• Ontology describes the Shuttle’s System and parts
• Visualization shows connection between shuttle parts and functions
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Hierarchies
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Space Tree
• Node-link tree design
• Dynamic Rescaling
• Zooming
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Taxon Tree
• Designed to show hierarchy of animal taxonomy
• SpaceTree layout combined with dynamic queries
• http://www.cs.umd.edu/hcil
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Challenge
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Challenge for Visualization Tools
• National Cancer Institute Ontology• Golbeck, Jennifer, Gilberto Fragoso, Frank Hartel, Jim Hendler, Bijan
Parsia, Jim Oberthaler, " The National Cancer Institute’s Thesaurus and Ontology," to appear in the Journal of Web Semantics, vol 1 (1).
• http://www.mindswap.org/2003/CancerOntology
• 17,000 classes• ~500,000 triples• 32MB
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Contact
• Jennifer Golbeck
MINDSWAP: http://www.mindswap.org
Human Computer Interaction Lab : http://www.cs.umd.edu/hcil