dbpedia mobile
DESCRIPTION
TRANSCRIPT
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Presentation By: Kishoj Bajracharya
Roll Number: st111224
Topic: DBpedia Mobile
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Location Based Application
of the Linked data
KISHOJ BAJRACHARYA
Roll No : 111224
DBpedia Mobile: A Location
Aware Semantic Web Client
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Linked Data
� A set of best practices for publishing and connecting structured data on the Web.
Principle of Linked data
� Use URIs as names for things.� Use URIs as names for things.� Use HTTP URIs so that people can look up those
names.� When someone looks up a URI, provide useful
information, using the standard formats. � Include links to other URIs for discovering more
things.
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Example of Publishing Linked Data using
D2R Server
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Linking Open Data Cloud Diagram
Only 25 dataset on 2007-10-08
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Linking Open Data Cloud Diagram
203 dataset on 2010-09-22
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Example of Consuming Linked data
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What is this paper all about?
� Location based applications� Useful for tourists.� Exploration of the places while visiting new places.� Using Mobile phone as a guide.� Getting other relevant information of nearby places.
� Based on the current GPS position, locates the position of user.
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What is this paper all about? (Contd.)
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What is this paper all about? (Contd.)
� Use position of the user to build SPARQL query and run it against different SPARQL endpoints, gather all relevant data.
� Data are retrieve from multiple linked data sources.
� Renders a map indicating nearby locations with current position & display background information.
� Discover, search and publish Linked Data on the Semantic Web using their mobile devices.
� Publishing content is interlinked with a nearby DBpedia resource.
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Why this paper is useful?
� Growing of linked open data cloud.
� Easy accessibility of linked data using SPARQL query.
� A real location based application of linked data which is very useful
� Support in many smart phones web-browser and all major desktop browsers. Example: Safari on iPhoneor Opera Mobile 8 on Windows Mobile, etc.
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Why this paper is useful?
� For desktop browsers, location estimated based on his IP address location.
� Performs "geo-tagging" to "resource-tagging" and allows users to contribute to Geospatial Semantic allows users to contribute to Geospatial Semantic Web.
� Discover, search and publish Linked Data on the Semantic Web using their mobile devices
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How
� Mobile phone’s GPS receiver => Location w.r.t. latitude & longitude.
� From latitude & longitude => Original location� geo:lat� geo:long
� SPARQL queries are run against different SPARQL endpoints of different linked data sources.
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How (Contd.)
� Data sources used are:� GeoNames: For locations
� Flickr TM wrapper: For images.
� Factbook: Provides statistical information about location.
� Revyu: Review about a location
� Yago: Information for location (museums, monuments, train stations)
� FOAF profile by individual based on worked at, were born at
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Example
http://www.geonames.org/maps/showOnMap?q=Ba
ngkok
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Example of application that display
images from RDF of Flickr TM Wrapper
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Running SPARQL query on Revyu
SPARQL Endpoint
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SPARQL response from Revyu SPARQL
Endpoint
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Data Sources:
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How (Contd.)
� Retrieves interlinked data from the Web.
� Caches retrieved data in a server-side RDF store.
� Dereferences the resource URI.� Dereferences the resource URI.
� Query the Sindice Semantic Web search engine for related information, as well as Revyu for reviews.
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DBpedia Mobile (Demo)
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Filter Information
� To limit the display to resources, SPARQL filter is used.
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Filter Information(Contd.)
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Publishing Linked data to Web
� User may publish his current location, photos &reviews, interlinked with DBpedia resources.
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Publishing Linked data to Web (Contd.)
� Log in and opens the Content Creation Panel.� Select the type of information to publish (i.e. position,
photo or review)� Choose a DBpedia location to be used to tag the
publish.
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� http://linkeddata.org/� http://www.w3.org/DesignIssues/LinkedData.html� http://richard.cyganiak.de/2007/10/lod/� http://wiki.dbpedia.org/DBpediaMobile� http://beckr.org/DBpediaMobile/
References
� http://beckr.org/DBpediaMobile/
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