Towards Meaningful URIs
        for Linked Sensor Data

K. Janowicz, A. Broering, C. Stasch, T. Everding

     Towards Dig...
Vision


 World Wide Web   is for websites
   HTTP
   HTML
   ...


 Sensor Web       is for sensors
     O&M
     ...
Sensor Web Enablement (SWE)

            ®
OGC
    http://www.ogcnetwork.net/swe


 Web Service interfaces & data encodi...
SWE Functionality
Project: GITEWS
Sensor Observation Service

               GetCapabilities




SensorML       DescribeSensor


   O&M         GetObservati...
Observations & Measurements

              Observed Property:= „Windspeed“                        Sampling Time
          ...
Observations & Measurements

class O&M


                                     Observ ation                                ...
Goal: Linked Sensor Data

To improve browsing & discovery of sensor data




                            Arne Broering - b...
Vision


 World Wide Web    is for websites / documents
   HTTP
   HTML
   ...

 Sensor Web        is for sensors
  ...
Linked Data

 Shift from linked documents to linked data

 Establish links:
    Documents: HTML
    Data: RDF


 Alre...
Linked Data

 Example usage:
   What proteins are involved in signal transduction AND are
    related to pyramidal neuro...
Linked Sensor Data

 Requirements

   Linked Data Model (in RDF)

   Links between data chunks

   Unified Resource Id...
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:
     ...
URI Scheme for Linked Sensor Data

 Access to observations:
     http://my.authority.org/observations


 Thematic filter...
URI Scheme for Linked Sensor Data

 Temporal filter (aligned with ISO8601):

   ../observation/sensor/foi/observed proper...
URI Scheme for Linked Sensor Data

 Spatial filter:
  ../<start>/<end>/<minLat>_<minLong>_<maxLat>_<maxLong>_<crs>


   ...
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...
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/RESTF...
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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, 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.

Get the paper here:
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

    Try the demo of this RESTful SOS proxy: http://v-swe.uni-muenster.de:8080/52n-OXF-WS/RESTful/sos
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Meaningful URIs for Linked Sensor Data

  1. 1. Towards Meaningful URIs for Linked Sensor Data K. Janowicz, A. Broering, C. Stasch, T. Everding Towards Digital Earth Workshop @ FIS2010, Berlin September 20th, 2010
  2. 2. Vision  World Wide Web is for websites  HTTP  HTML  ...  Sensor Web is for sensors  O&M  SOS  SPS  ... Arne Broering - broering@52north.org
  3. 3. 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
  4. 4. SWE Functionality
  5. 5. Project: GITEWS
  6. 6. Sensor Observation Service GetCapabilities SensorML DescribeSensor O&M GetObservation GML GetFeatureOfInterest Arne Broering - broering@52north.org
  7. 7. 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
  8. 8. 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
  9. 9. Goal: Linked Sensor Data To improve browsing & discovery of sensor data Arne Broering - broering@52north.org
  10. 10. 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
  11. 11. 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
  12. 12. 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
  13. 13. Linked Sensor Data  Requirements  Linked Data Model (in RDF)  Links between data chunks  Unified Resource Identifier (URI) Scheme Arne Broering - broering@52north.org
  14. 14. RESTful SOS Proxy for Linked Sensor Data Arne Broering - broering@52north.org
  15. 15. 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
  16. 16. 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
  17. 17. 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
  18. 18. 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
  19. 19. RESTful SOS Architecture Arne Broering - broering@52north.org
  20. 20. 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
  21. 21. Demo: RESTful SOS Proxy http://v-swe.uni-muenster.de:8080/52n-OXF-WS/RESTful/sos
  22. 22. 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
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