A number of government, corporate, and academic organizations are collecting enormous amounts of data provided by environmental sensors. However, this data is too often locked within organizations and underutilized by the greater community. In this paper, we present a framework to make this sensor data openly accessible by publishing it on the Linked Open Data (LOD) Cloud. This is accomplished by converting raw sensor observations to RDF and linking with other datasets on LOD. With such a framework, organizations can make large amounts of sensor data openly accessible, thus allowing greater opportunity for utilization and analysis. Authors - Harshal Patni, Cory Henson, Amit Sheth * First attempt on Linked Sensor Data

2. 48th ACM Southeast Conference. ACMSE 2010. Oxford, Mississippi. April 15-17, 2010. Linked Sensor Data HarshalPatni, Cory Henson, Amit P. Sheth Ohio Center of Excellence in Knowledge enabled Computing (Kno.e.sis) Wright State University, Dayton, OH

4. What is Linked Sensor Data

5. Sensor Datasets Generated

6. Data Generation Workflow

7. Future Work

8. Conclusion3

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

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

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

13. Average 5 sensors/weather station

14. Spatial attributes of the weather station

16. Observations generated by sensors described in LinkedSensorDataset7

17. Data Generation Workflow O&M2RDFCONVERTER 8

18. Workflow – Phase 1 9

19. Workflow – Phase 2 10

20. Workflow – Phase 3 Sensor Ontology Ontology – formal representation of knowledge by a set of concepts and relationship between those concepts

21. Workflow – Phase 3 Figure 1: System Components and Architecture

22. Workflow – Phase 4 Open Source RDF store by OpenLink Software for storing RDF data

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

24. x CONCLUSION 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 15

26. QUESTIONS 17

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