Linked Sensor Data Harshal Patni, Cory Henson, Amit P. Sheth Ohio Center of Excellence in Knowledge enabled Computing (Kno.e.sis) Wright State University, Dayton, OH 48 th ACM Southeast Conference. ACMSE Oxford, Mississippi. April 15-17, 2010.

OUTLINE  Application on Linked Sensor Data  What is Linked Sensor Data  Sensor Datasets Generated  Data Generation Workflow  Future Work  Conclusion 3

Sensor Discovery Application 4 Weather Station ID Weather Station Coordinates Weather Station Phenomena Current Observations from MesoWest MesoWest – Project under Department of Meteorology, University of UTAH GeoNames – Geographic dataset

What is Linked Sensor Data 5 Weather Sensors Camera Sensors Satellite Sensors GPS Sensors Sensor Dataset

What is Linked Sensor Data 6 Sensor Dataset Publicly Accessible Recommended best practice for exposing, sharing, and connecting pieces of data, information, and knowledge on the Web using URIs and RDF RDF – language for representing data on the Web locatedNear GeoNames Dataset

zn Sensor Datasets 7 LinkedSensorDataset RDF Descriptions of ~20,000 weather stations in US Average 5 sensors/weather station Spatial attributes of the weather station Links to locations in Geonames LinkedObservationDataset RDF descriptions of Hurricanes and Blizzard observations in US Observations generated by sensors described in LinkedSensorDataset

MesoWest Service Data OGC Observation and Measurement (O&M) RDF Instance Virtuoso RDF store Data Generation Workflow 8 O&M2RDFCONVERTER

Workflow – Phase 1 9 MesoWest Service Data OGC Observation and Measurement (O&M) RDF Instance Virtuoso RDF store

Workflow – Phase 2 10 MesoWest Service Data OGC Observation and Measurement (O&M) RDF Instance Sesame RDF store

Workflow – Phase 3 MesoWest Service Data OGC Observation and Measurement (O&M) RDF Instance Virtuoso RDF store Sensor Ontology Ontology – formal representation of knowledge by a set of concepts and relationship between those concepts

Figure 1: System Components and Architecture Workflow – Phase 3 MesoWest Service Data OGC Observation and Measurement (O&M) RDF Instance Virtuoso RDF store

Workflow – Phase 4 MesoWest Service Data OGC Observation and Measurement (O&M) RDF Instance Virtuoso RDF store Open Source RDF store by OpenLink Software for storing RDF data

Future Work 14 Linked Observation Dataset Temporal Linking the LinkedObservationDataset to DBpedia (RDF extraction of Wikipedia) Linked Sensor Dataset Spatial

x Publicly accessible Rich Weather Sensor datasets Datasets are easy to query Able to query Sensors based on location names Built O&M2RDFConverter to generate more publicly accessible sensor datasets CONCLUSION 15

ACKNOWLEDGEMENTS People Joshua Pschorr Air Force Research Lab Wright-Patterson Air Force Base 16

QUESTIONS 17

Semantic Web extension of the current web common vocabulary machine processable Semantic Web – is an extension of the current web in which data is expressed in a common vocabulary making such that the data becomes machine processable. Ontology conceptsrelationships Ontology – is a specification of concepts and relationships between them. Triple subject-predicate-object Triple - a ternary relation containing an entity pair and a relationship that expresses the link between them i.e. subject-predicate-object Entity/Concept thing Entity/Concept – an instance of a thing URI URI – a unique identifier for any resource/entity/thing on the web LOD LOD - a semantic web initiative to provide a repository of semantically connected datasets TERMINOLOGY 18