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Creating Visualizations with Linked Open Data
This document discusses creating visualizations with linked open data using Visualbox. It begins with an overview of linked data and how to query it using SPARQL. Examples are provided of SPARQL queries to retrieve data about London and schools in London from public linked data sets. The document then introduces Visualbox as a tool for applying visualizations to the query results. It describes the components of Visualbox including using a SPARQL query to obtain data, selecting a visualization type and filters, testing the query, and viewing or embedding the final visualization.
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Creating Visualizations with Linked Open Data
- 1.CREATING VISUALIZATIONSWITH LINKEDOPEN DATA Alvaro Graves @alvarograves alvaro@graves.cl
- 2.AGENDA• What is Linked Data?• How can I query Linked Data?• How to create visualizations using Visualbox
- 3.WHAT IS LINKEDDATA?• Linked Data is a way to publish data in a machine- readable way• Itallows you to describe information about things on the Web and their relationships• Government, NGOs and universities publish Linked Data
- 4.WHAT IS LINKEDDATA?• Example: • London is the capital of England. • London’s population is 8 million people • England is a Country.
- 5.WHAT IS LINKEDDATA? England is a capital of Country London population 8.000.000• England is a Country.• England ‘s capital is London.• London’s population is 8 million people
- 6.ON THE WEB...• We create a URI (i.e., “web address”-like identifier) for everything • London → http://dbpedia.org/resource/London • England → http://dbpedia.org/resource/England • Country → http://dbpedia.org/ontology/Country• Same for relations! • capital of → http://dbpedia.org/ontology/capital • is a → http://www.w3.org/1999/02/22-rdf-syntax-ns#type • population → http://dbpedia.org/ontology/populationUrban
- 7.LINKED DATA England is a capital of Country London population 8.000.000 http://dbpedia.org/resource/England http://dbpedia.org/ontology/capital http://www.w3.org/1999/02/22-rdf-syntax-ns#typehttp://dbpedia.org/resource/London http://dbpedia.org/ontology/populationUrban http://dbpedia.org/ontology/Country 8.000.000
- 8.HOW CAN IQUERY LINKED DATA?• We can use SPARQL, a query language for Linked Data• People (and governments) publishes Linked Data in SPARQL endpoints that can be queried
- 9.HOW SPARQL LOOKSPREFIXdbo: <http://dbpedia.org/ontology/>PREFIX dbp: <http://dbpedia.org/resource/>SELECT ?city ?population WHERE{ dbp:England dbo:capital ?city . ?city dbo:populationUrban ?population .}
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- 11.SCHOOLS IN THECITY OF LONDONPREFIX sch-ont: <http://education.data.gov.uk/def/school/>PREFIX geo: <http://www.w3.org/2003/01/geo/wgs84_pos#>PREFIX district: <http://statistics.data.gov.uk/id/local-authority-district/>SELECT ?school ?name ?lat ?long WHERE { ?school a sch-ont:School; sch-ont:establishmentName ?name; geo:lat ?lat; geo:long ?long; sch-ont:districtAdministrative district:00AA .}ORDER BY ?name
- 12.RESULTS Executed against http://education.data.gov.uk/sparql/education/query school name lat longhttp://education.data.gov.uk/id/school/581261 Barbican Playgroup 51.51879 -0.09267 Buffer Bear @ Barts &http://education.data.gov.uk/id/school/531003 51.51697 -0.10086 the London Charterhouse Squarehttp://education.data.gov.uk/id/school/590270 51.52038 -0.09886 School
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- 14.HOW TO CREATE VISUALIZATIONS• Part 1: Obtain the data ✓• Part 2: Apply a visualization → Visualbox
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- 17.VISUALBOX SPARQL query
- 18.VISUALBOX Visualization (HTML)
- 19.VISUALBOX Visualization Filters
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- 21.VISUALBOX Query testing Results
- 22.VISUALBOXView & embedcomponent
- 23.START PLAYING WITH VISUALBOX Edit: Final demos available athttp://orion.tw.rpi.edu/~agraves/mozfest/index.html