open data repositories and big data ard prasad drtc, indian statistical institute bangalore
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Open Data Repositories and
Big Data
ARD PrasadDRTC, Indian Statistical Institute
Bangalore
Our Interest
We are working on (semantics of Big Data)
Structured Data
Hosting data repositories
Metadata of Big data
Ontology
Linked Open Data (LOD) Presently NOT working on
Unstructured Data (especially on social networks)
Data Analytics
Semantic Web
Semantic web can be realized only when the web provides answers to queries than web pages
Scope
The Semantic Web is a Web of Data ... The collection of Semantic Web technologies (RDF, OWL, SKOS, SPARQL, etc.) provides an environment where application can query that data, draw inferences using vocabularies, etc. Linked data (http://www.w3.org/standards/semanticweb/data)
Metadata Of books/Documents (Dublin Core etc.) Products Events Processes Organizations Individuals (FOAF) Keywords (Ontology) Preservation (PREMIS) DATA
Looking Back
Open Access to Information (OAI)
•A Fairly successful movement, resulted in•Open Access Repositories (> 2000)•Open Access Journals (> 5000)
•Partially bridging digital divide in Social, Physical, Natural Sciences and Humanities,
Nature of Publications
Many publications use data. Actual article may not have complete data used
• For lack of space• Author might have overlooked the data• Author deliberately did not present data - so that others can not verify the data
For Example
Some suspect that Sigmund Freud's data is of fictious persons, it is not just fictitious names
If data is available ...
• Others may draw different conclusions contradictory to that of the author
• Others may deal with other facets of the data• Data Transparency supplements the Objectivity
and self corrective characteristics of Science
If “Case history of patients” is openly available, it will contribute significantly to medical research
Digital Divide• Social Sciences do not require laboratory
infrastructure• However, physical and natural sciences do
require expensive infrastructure• If experimental data is available to scientists that
do not have infrastructure, it will significantly reduce digital divide in Physical and Natural Sciences
ODA is a step toward transparency and quality in science
For Example
• Human Genome data• Data from Accelerator Labs (CERN)• Recent controversy about particle moving faster
than light• Not surprisingly, astronomy data is openly
available even before the OA movement
Features of Open Data Repositories
• Metadata: specify who is the owner, creator etc
• license the data to waive your rights to facilitate bulk download Open Data
• Technology Tools: automate data extraction
• Ontology: Index data
Licences
Creative Commons licenses (apart from CCZero), GPL, BSD, etc are NOT quite appropriate for
open data licences
Open Data Licences
• Open Data Commons Public Domain Dedication and Licence (PDDL)
• Dedicate to the Public Domain (all rights waived)• Open Data Commons Attribution License• Attribution for data(bases)• Open Data Commons Open Database
License (OdbL)• Attribution-ShareAlike for data(bases)• Creative Commons CCZero• Dedicate to the Public Domain (all rights waived)
Amazon Web Services (AWS)
Public Data Sets on AWS• Annotated Human Genome Data provided by ENSEMBL– The Ensembl project produces genome databases for human
as well as almost 50 other species, and makes this information freely available.
• Various US Census Databases from The US Census Bureau– Demographic data– US Censuses– Summary information about Business and Industry– Economic Household Profile Data.
• UniGene provided by the National Center for Biotechnology Information
Data Repositories by Governments
Many countries are hosting their data on data.gov in various formats like RDF, XSL, JSON, CSV etc.
Ex: www.data.gov.in (India) Www.data.gov (USA) Www.data.gov.au (Australia) Www.data.gov.uk (UK)
Registry of Data Repositories
Popular Data Registries:- Databib and re3data.org
Databib connects to 978 data repositories and databases (agriculture,Geo-sciences,social Sciences,Biological sciences)
re3data.org currently lists 634 research data repositories from different disciplines and 586 of these are described in detail using the re3data.org schema.
In future, Databib and re3data.org are likely to get merged into one service.
Note: The registry entries provide URL to the data repository and also a brief description of it. Manually one has to visit and download the data from the data repository. Again, no protocol to expose metadata of data providers
Digital Curation
• Collecting verifiable digital assets• Providing digital asset search and retrieval• Certification of the trustworthiness and integrity
of the collection content• Semantic and ontological continuity and
comparability of the collection content• Use of open standards (formats) for term
preservation and future proofing by migration of data
Technology
• Data repositories are much larger than OA repositories
• Cloud Computing is a good solution (AWS uses)• Hadoop
Resource Description in terms of Metadata and Ontology
RDF: Resource Description Framework SKOS: Simple Knowledge Organization
System OWL: Web Ontology Language
SPARQL: SPARQL Protocol and RDF Query Language
NoSQL DBMS
Key / Value Based Redis, MemcacheDB, etc.
Column Based Cassandra, HBase, etc
Document Based MongoDB, Couchbase, etc
Graph Based AllegroGraph, Neo4J, etc.
DBpedia Data Set
Multi-domain ontology derived from Wikipedia 3.77 million “things” (entities - Entitypedia) 400 million “facts” Uses YAGO (Yet Another Great Ontology)
Entitypedia
Multilingual controlled vocabulary Entity matching Data quality and type checking Entity type specific services Semantic or faceted search and navigation on
entities Summarization of entities and concepts
DRTC Projects
Living Knowledge (European Commission funded project on semantic web based on SRR's Analytico Synthetic Classification, completed)
ITPAR: India-Trento Program for Advanced Research
(Govts. Of India & Italy; Work on DERA, Ongoing)
AgInfra: Agriculture data (European Commission funded, Agriculture data, ongoing)
Immediate Plan
An international workshop on Big Data with ICSU/CODATA
Thank You