Meaningful URIs for Linked Sensor Data
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Meaningful URIs for Linked Sensor Data

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Sensor data is stored and published using OGC’s Observation & Measurement specifications as underlying data model. With the advent of volunteered geographic information and the Semantic Sensor Web, ...

Sensor data is stored and published using OGC’s Observation & Measurement specifications as underlying data model. With the advent of volunteered geographic information and the Semantic Sensor Web, work on an ontological, i.e. conceptual, model gains importance within the Sensor Web Enablement community. In contrast to a data model, an ontological approach abstracts from implementation details by focusing on modeling the real world from the perspective of a particular domain or application and, hence, restricts the interpretation of the used terminology towards their intended meaning. The shift to linked
sensor data, however, requires yet another perspective. Two challenges have to be addressed, (i) how to refer to changing and frequently updated data sets such as stored in Sensor Observation Services using Uniform
Resource Identifiers, and (ii) how to establish meaningful links between those data sets, i.e., observations, sensors, features of interest, observed properties, and further participants in the measurement process. In this short paper we focus on the problem of assigning meaningful URIs.

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http://ifgi.uni-muenster.de/~arneb/de2010_final_submission.pdf

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  • Get the paper here: http://ifgi.uni-muenster.de/~arneb/de2010_final_submission.pdf

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Meaningful URIs for Linked Sensor Data Meaningful URIs for Linked Sensor Data Presentation Transcript

  • Towards Meaningful URIs for Linked Sensor Data K. Janowicz, A. Broering, C. Stasch, T. Everding Towards Digital Earth Workshop @ FIS2010, Berlin September 20th, 2010
  • Vision  World Wide Web is for websites  HTTP  HTML  ...  Sensor Web is for sensors  O&M  SOS  SPS  ... Arne Broering - broering@52north.org
  • Sensor Web Enablement (SWE) ® OGC  http://www.ogcnetwork.net/swe  Web Service interfaces & data encodings  Building blocks for a Sensor Web Arne Broering - broering@52north.org
  • SWE Functionality
  • Project: GITEWS
  • Sensor Observation Service GetCapabilities SensorML DescribeSensor O&M GetObservation GML GetFeatureOfInterest Arne Broering - broering@52north.org
  • Observations & Measurements Observed Property:= „Windspeed“ Sampling Time Result Feature of Interest:= „SeminarisHotelBerlin“ 23 m/s 16.9.2010 13:45 Unit of Measure Sensor := „Weatherstation_Dahlem“ Observation Arne Broering - broering@52north.org
  • Observations & Measurements class O&M Observ ation Any +result - samplingTime: Time 1 0..* +propertyValueProvider +procedure +observedProperty +featureOfInterest 1 1 1 Procedure PropertyType «FeatureType» AnyFeature Arne Broering - broering@52north.org
  • Goal: Linked Sensor Data To improve browsing & discovery of sensor data Arne Broering - broering@52north.org
  • Vision  World Wide Web is for websites / documents  HTTP  HTML  ...  Sensor Web is for sensors  SOS  O&M  ...  Linked Data Web is for linked data  RDF  ... Arne Broering - broering@52north.org
  • Linked Data  Shift from linked documents to linked data  Establish links:  Documents: HTML  Data: RDF  Already available linked data:  people, companies, publications, books, movies, music, television programs, genes, proteins… Arne Broering - broering@52north.org
  • Linked Data  Example usage:  What proteins are involved in signal transduction AND are related to pyramidal neurons?  Google search: 200.000 hits, NO results  Linked Data search: 32 hits, 32 results (see TED Talk from Berners-Lee)  Example “GEO”-usage:  Which sensors are located along the river Rhine AND measure water level higher than 4,50 m during yesterday? Arne Broering - broering@52north.org
  • Linked Sensor Data  Requirements  Linked Data Model (in RDF)  Links between data chunks  Unified Resource Identifier (URI) Scheme Arne Broering - broering@52north.org
  • RESTful SOS Proxy for Linked Sensor Data Arne Broering - broering@52north.org
  • URI Scheme for Linked Sensor Data  Access to features of interest: http://my.authority.org/foi  Example: http://my.authority.org/foi/SeminarisHotelBerlin  Access to sensors: http://my.authority.org/sensors  Example: http://my.authority.org/sensors/Weatherstation_Dahlem Arne Broering - broering@52north.org
  • URI Scheme for Linked Sensor Data  Access to observations: http://my.authority.org/observations  Thematic filter: ../observation/<sensor>/<foi>/<observed property>  Example: ../observations/Weatherstation_Dahlem/SeminarisBerlin/windSpeed  Example “Wildcard”: ../observations/-/-/windSpeed Arne Broering - broering@52north.org
  • URI Scheme for Linked Sensor Data  Temporal filter (aligned with ISO8601): ../observation/sensor/foi/observed property/<start date>/<end date> <start date>:= <year>/<month>/<day>/<hour>/<minute>/<second> <end date> := <year>/<month>/<day>/<hour>/<minute>/<second>  Example: February 2010 - 1st July 2010 at 13:05: ../2010/02/-/-/-/-/2010/07/01/13/05/-/.. Arne Broering - broering@52north.org
  • URI Scheme for Linked Sensor Data  Spatial filter: ../<start>/<end>/<minLat>_<minLong>_<maxLat>_<maxLong>_<crs>  Example: ../52.12_7.45_52.34_7.56_urn:ogc:def:crs:EPSG::4326 Arne Broering - broering@52north.org
  • RESTful SOS Architecture Arne Broering - broering@52north.org
  • Outlook  Linked Data model (O&M  RDF)  Accepted by W3C Semantic Sensor Network Incubator Group (http://www.w3.org/2005/Incubator/ssn/)  Meaningful Links within model  Include other SWE standards:  SensorML  RDF  RESTful SES Proxy Arne Broering - broering@52north.org
  • Demo: RESTful SOS Proxy http://v-swe.uni-muenster.de:8080/52n-OXF-WS/RESTful/sos
  • Questions? Thank you! Arne Broering broering@52north.org 52°North RESTful SOS Proxy: http://52north.org/RESTFul_SOS 52°North Semantics Community: http://52north.org/semantics IfGI SWSL: http://swsl.uni-muenster.de IfGI MUSIL: http://musil.uni-muenster.de