Semantic Web Challenges for Visualisation and Visual Analytics

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Talk at retreat of Daniel Kiem's Konstanz visualisation research group. The tal

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Semantic Web Challenges for Visualisation and Visual Analytics

  1. 1. Semantic Web Challenges for Visualisation & VA<br />Alan Dix<br />Lancaster Universityand Talis<br />hcibook.com/alanalandix.com/blog<br />
  2. 2. Semantic Web – What is it?<br />web of data for computation<br />technologies: RDF, OWL, triples and ontologies<br />everything comes in threes<http://alandix.com/me> <foaf:name> “Alan Dix” .<http://alandix.com/me> <bz:works_at> <http://talis.com/> .<br />linking (open) data<br />
  3. 3. LOD cloud<br />
  4. 4. three paths to Sem Web<br /><fresh><semantic><data><br />SemWeb:RDF,etc.<br />from HTMLadd markup (RDFa)or data detectors<br />from existing data(CSV, RDMS, etc.)<br />
  5. 5. from raw data to semantic data<br />existingraw data<br />convert /describe<br /><RDF><triples><br />linkedopen data<br />linkage(via URIs)<br />
  6. 6. existing raw data<br />understanding: data, domain, connections<br />focus on structure<br />heterogeneous representations<br />different views (for different purposes) de-normalised<br />sub-unit semantics (e.g. “1000 kp rising” )<br />super-unit semantics (e.g. lat&long)<br /><RDF><br />
  7. 7. converting / describing<br />identity:are two things in different places the same<br />rules and exceptionslarge so try to do it with rules (e.g. natural keys) but need exceptions when rules don’t hold ... finding them – outliers<br />combination of hand-craft and crafted automation = visual analytics !!<br /><RDF><br />
  8. 8. RDF / Semantic Data<br />schema-lessvocabulary, but optional schema<br />potentially rich class & predicate typescoloured graph, not just tables! sometimes level mixing (meta-instance) and maybe BIG<br />sometimes text + structure (e.g. ODP)but many small text units (unlike classic IR) <br /><RDF><br />
  9. 9. linkage<br />establishing identity<br />value relationships<br />similar issues to raw=>RDF transformation<br /><RDF><br />
  10. 10. linked open data<br />heterogeneous<br />incomplete<br />pluggable visualisations<br />URI links ... but also value relationships<br />very BIG – the web of data<br /><RDF><br />
  11. 11. let me know what you do!<br />

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