Meaningful URIs for Linked Sensor Data

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

Meaningful URIs for Linked Sensor Data

by Arne Broering on Sep 20, 2010

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Meaningful URIs for Linked Sensor Data — Presentation Transcript

http://swsl.uni-muenster.de	23
http://sensorweb.uni-muenster.de	1