Digital Media Technology Week 13: LOD and Visualisation Peter Verhaar

Client-side interface made for you “The deep web” Client-side interface made for you Leiden University. The university to discover. Leiden University. The university to discover.

SQL PHP HTML http database HTML client server

Conversion from data to linear text (Cf. Manovich: databases vs Conversion from data to linear text (Cf. Manovich: databases vs. narratives)

BOOK_ID TITLE ISBN13 1 To Kill a Mockingbird 9780446310789 2 The Great Gatsby 9781853260414 subject: “Book-ID” Predicate: “hasISBN13” Object: “9780446310789” subject: “Book-ID” Predicate: “hasTitle” Object: “To Kill a Mockingbird”

The Semantic web Envisaged by Tim Berners-Lee as “a web of data that can be processed directly and indirectly by machines” RDF-Triples

http://lod-cloud.net/

dbPedia

Nano-Publications

Semantic Publishing

STCN SPARQL Endpoint

SPARQL Simple Protocol AND RDF Query Language “SQL” for Linked Open Data E.g. SELECT * WHERE { ?book dc:type schema:Book. ?book dc:title ?titel. ?book dc:publisher ?p. ?p skos:prefLabel "Elzevier, Bonaventura". }

Visualisation code library Result of SQL-query Visualisation code library

Visualisation code libraries Google Charts D3.js

Definitions of visualisation Distinction between “scientific visualisation” and “information visualisation” Lev Manovich: “a mapping between discrete data and a visual representation” (p. 2) Conversion to a graphic modality

Source: http://www.infovis- wiki.net/ Graphical modality Jacques Bertin, Semiology of Graphics Leland Wilkinson, Grammar of Graphics Source: http://www.infovis- wiki.net/