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Towards Multi-use of ocean data on the semantic web

Towards Multi-use of ocean data on the semantic web. Barry Tao, Jon Campbell, Gwyn Griffiths. Why USL?. Surely this is largely the preserve of data managers? By designing/building/operating a variety of platforms/instruments/sensors we are mainly data providers rather than users

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Towards Multi-use of ocean data on the semantic web

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  1. Towards Multi-use of ocean data on the semantic web Barry Tao, Jon Campbell, Gwyn Griffiths

  2. Why USL? • Surely this is largely the preserve of data managers? • By designing/building/operating a variety of platforms/instruments/sensors we are mainly data providers rather than users • We have control over, and responsibility for how data are recorded, formatted • BODC have already begun work in this area – our efforts will complement this

  3. Example of traditional ocean data gathering – Pride of Bilbao Ferrybox Sensors from different manufacturers need tailored software interfaces Data logged in special format Custom software required for each stage of processing Metadata recorded by hand

  4. Vision for the future • The sensors themselves should be self-describing and able to provide a complete set of metadata on request • The data structures should also be self-describing with machine readable headers defining the data types, formats and metadata • By following internationally agreed standards data would be immediately accessible to other organizations around the world • Time taken to interface new sensors and adapt software to handle new data types is greatly reduced

  5. Where to start? • Underpinning all this there has to be a set of agreed vocabularies and relationships • In other words an ontology • Over to Barry…

  6. Meta-data on data entries Year Jtime, … gps-x, gps-y, …, measurements, … Meta-data on data file Filename: all_ProB_2008.sts File location: \REMOTETEL\ascdata\Pride_of_Bilbao\concat Parameters Recorded: Salinity, temperature, conductivities Year: 2008 Location: Portsmouth, Bilbao • a formal context • shared and consistent conceptualisation • facilitate flexible annotating and linking resources • distributed contributions and reuse • scalability The Art of Enriching Data • Data Metadata  Ontology/Semantic Web all_PofB_2008.sts • … … • 2008 17.40278244 3599.98 20.00 11.81 0 3464 64708 0 0 101.0625 0.0 • 2008 17.44444656 3599.87 20.56 12.25 0 3600 1004 0 0 101.0625 3599.9 • 2008 17.48611259 3599.98 21.31 12.81 0 3600 301 0 0 101.0605 3600.0 • 2008 17.52778053 3599.98 20.81 12.69 0 3600 7186 0 0 101.0605 3600.0 • 2008 17.56944656 3600.04 21.37 13.31 0 3463 12216 0 1 101.0586 3600.0 • 2008 17.61111259 3599.93 21.31 12.94 0 3600 65202 0 0 101.0586 3599.9 • 17.65277863 3599.98 18.50 10.19 0 3600 64947 0 0 101.0586 3600.0 • … …

  7. The Semantic Web • A Web of machine process-able meanings • W3C (WWW Consortium) • Ontology (concepts and relations) • RDF (Resource Description Framework), URI (Universal Resource Identifier) • Open up data to the SW community • Typical semantic web activities for knowledge management • Ontology engineering • Knowledge acquisition • Shared conceptualisation – concepts and relations • OWL (Web ontology language) • Semantic annotation • Enriching resources using ontology • Generating RDF • Semantic processing • Query • Reasoning

  8. Semantic Web example in RDF • Things to express • JohnSmith        lastname        Smith • JohnSmith        sibling            KevinSmith • RDF Graph • Namespace and URI • <xmlns:foaf="http://xmlns.com/foaf/0.1/"> • <xmlns:rdfs=http://www.w3.org/2000/01/rdf-schema#><xmlns:family=http://www.example.org/ontology/family.owl> • RDF Triples • <Subject Predicate Object > • http://www.example.org/people/JohnSmith          rdfs:label                 "John Smith" • http://www.example.org/people/JohnSmith        foaf:lastName          "Smith" • http://www.example.org/people/JohnSmith          family:sibling      http://www.example.com/people/KevinSmith • http://www.example.org/people/JohnSmith          family:age                42 • http://www.example.com/people/KeviSmith                 rdfs:label                 "Kevin Smith" • http://www.example.com/people/KeviSmith                  family:age                35 • Query on the Semantic Web SELECT ?name ?age WHERE (?x rdfs:label ?name)       (?x family:age ?age)     AND ?age < 40 • "Kevin Smith" 35 “Smith” foaf:lastname John Smith family:sibling Kevin Smith

  9. Collaborative Ocean • Agile Knowledge Engineering • Multiple domain experts (on sensor, platform, etc) • Distributed and asynchronised contributions • Experimental testbeds of semantic web applications for CO • Collaborative protégé • Ontowiki • Potential collaborators and related technologies • SeaDataNet (EU) - to construct a standardized system for managing the large and diverse data sets collected by the oceanographic fleets and the new automatic observation systems • Marine Metadata Interoperability, MMI (US) – Encourage good good metadata practices in marine science • BODC (UK) – Data and metadata archive of marine measurement • SensorML – XML models for processes related to sensor and sensor measurement • Sensor Web Enablement (SWE) in OGC • Results • Methodology and framework • RDF knowledge repository • Possible Service Interface • SOAP Web services (independent of operation system) • Reusable portlets • Browser accessible Portal • A tutorial http://www.noc.soton.ac.uk/nmf/usl/bt/co.htm

  10. CO in Protégé

  11. Semantically annotated instances in RDF … … <rdf:RDF xmlns:co="http://wwwtest.noc.soton.ac.uk/nmf/usl/ontology/collaberativeocean.owl#" xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns="http://wwwtest.noc.soton.ac.uk/nmf/usl/ontology/collaberativeocean_ins.rdf#" xmlns:protege="http://protege.stanford.edu/plugins/owl/protege#" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:xsd="http://www.w3.org/2001/XMLSchema#" xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#" xmlns:owl="http://www.w3.org/2002/07/owl#" xml:base="http://wwwtest.noc.soton.ac.uk/nmf/usl/ontology/collaberativeocean_ins.rdf"> <owl:Ontology rdf:about=""> <owl:imports rdf:resource="http://wwwtest.noc.soton.ac.uk/nmf/usl/ontology/collaberativeocean.owl"/> </owl:Ontology> <co:ChemicalSensor rdf:ID="Aanderaa_Oxygen_optode"> <foaf:depiction rdf:datatype="http://www.w3.org/2001/XMLSchema#string" >http://lh4.google.com/joncam.usl/R88SEn_OgTI/AAAAAAAAACc/5F_ng9iSMfc/IMG_7879.JPG</foaf:depiction> <co:serial_number rdf:datatype="http://www.w3.org/2001/XMLSchema#string" >123456789</co:serial_number> <co:calibration_last_date rdf:datatype="http://www.w3.org/2001/XMLSchema#date" >2007-03-08</co:calibration_last_date> <co:purchase_date rdf:datatype="http://www.w3.org/2001/XMLSchema#date" >2007-03-08</co:purchase_date> </co:ChemicalSensor> </rdf:RDF> … …

  12. In Triples PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX foaf: <http://xmlns.com/foaf/0.1/> PREFIX co: <http://wwwtest.noc.soton.ac.uk/nmf/usl/ontology/collaberativeocean.owl#> PREFIX co_ins: <http://wwwtest.noc.soton.ac.uk/nmf/usl/ontology/collaberativeocean_ins.rdf#>

  13. In Graph

  14. Semantic Web Applications Protégé Ontowiki … … RDF Ontology Semantic Web Oceanography resources at NOC hardware personnel datasets operations Status • Collaborative ontology maturing • Sensor, Platform, etc. • Testing semantic annotation for Collaborative Ocean • Establish a ontological reference model • Integration with other SW applications • Ontowiki

  15. Further Information • The ontology http://wwwtest.noc.soton.ac.uk/nmf/usl/ontology/collaberativeocean.owl • The semantic annotations (instances) http://wwwtest.noc.soton.ac.uk/nmf/usl/ontology/collaberativeocean_ins.rdf • A tutorial http://www.noc.soton.ac.uk/nmf/usl/bt/co.htm

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