Semantic Web Challenges for Visualisation and Visual Analytics

Semantic Web Challenges for Visualisation & VA
Alan Dix
Lancaster Universityand Talis
hcibook.com/alanalandix.com/blog

Semantic Web – What is it?
web of data for computation
technologies: RDF, OWL, triples and ontologies
everything comes in threes<http://alandix.com/me> <foaf:name> “Alan Dix” .<http://alandix.com/me> <bz:works_at> <http://talis.com/> .
linking (open) data

LOD cloud

three paths to Sem Web
<fresh><semantic><data>
SemWeb:RDF,etc.
from HTMLadd markup (RDFa)or data detectors
from existing data(CSV, RDMS, etc.)

from raw data to semantic data
existingraw data
convert /describe
<RDF><triples>
linkedopen data
linkage(via URIs)

existing raw data
understanding: data, domain, connections
focus on structure
heterogeneous representations
different views (for different purposes) de-normalised
sub-unit semantics (e.g. “1000 kp rising” )
super-unit semantics (e.g. lat&long)
<RDF>

converting / describing
identity:are two things in different places the same
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
combination of hand-craft and crafted automation = visual analytics !!
<RDF>

RDF / Semantic Data
schema-lessvocabulary, but optional schema
potentially rich class & predicate typescoloured graph, not just tables! sometimes level mixing (meta-instance) and maybe BIG
sometimes text + structure (e.g. ODP)but many small text units (unlike classic IR)
<RDF>

linkage
establishing identity
value relationships
similar issues to raw=>RDF transformation
<RDF>

linked open data
heterogeneous
incomplete
pluggable visualisations
URI links ... but also value relationships
very BIG – the web of data
<RDF>

let me know what you do!

Semantic Web Challenges for Visualisation and Visual Analytics

by Alan Dix on Apr 20, 2011

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Semantic Web Challenges for Visualisation and Visual Analytics — Presentation Transcript