URI*
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http://www.w3.org/ns/ssn/
http://www.w3.org/ns/ssn/
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Contact*
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Mat Portal Metrology Import
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Object creation date property
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http://purl.org/dc/elements/1.1/created
http://purl.org/dc/elements/1.1/created
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Submission date
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April 17, 2026
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Deprecated
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false
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Description*
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The Semantic Sensor Network Ontology models sensors, systems, deployments, capabilities, and observation-related context. In metrology workflows it provides the provenance and instrument-model layer around how measurements are produced and under which operating conditions., This ontology describes sensors, actuators and observations, and related concepts. It does not describe domain concepts, time, locations, etc. these are intended to be included from other ontologies via OWL imports.
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Documentation
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https://www.w3.org/2015/spatial/wiki/Semantic_Sensor_Network_Ontology
https://www.w3.org/2015/spatial/wiki/Semantic_Sensor_Network_Ontology
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License
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Representation language*
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OWL
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Object modification date property
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http://purl.org/dc/elements/1.1/modified
http://purl.org/dc/elements/1.1/modified
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Notes
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Please report any errors to the W3C Spatial Data on the Web Working Group via the SDW WG Public List public-sdw-wg@w3.org
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Preferred namespace prefix
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ssn
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Preferred namespace URI
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http://www.w3.org/ns/ssn/
http://www.w3.org/ns/ssn/
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Access URL
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https://www.w3.org/ns/ssn/
https://www.w3.org/ns/ssn/
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Creation date*
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April 17, 2017
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Repository
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https://github.com/w3c/sdw-sosa-ssn
https://github.com/w3c/sdw-sosa-ssn
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Status*
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production
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URI Lookup Endpoint
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https://dev.matportal.org/search?ontologies=SSN&require_exact_match=true&q=
search?ontologies=SSN&require_exact_match=true&q=
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Imports
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http://www.w3.org/ns/sosa/
http://www.w3.org/ns/sosa/
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Version information
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New modular version of the SSN ontology.
This ontology was originally developed in 2009-2011 by the W3C Semantic Sensor Networks Incubator Group (SSN-XG). For more information on the group's activities see: http://www.w3.org/2005/Incubator/ssn/. The ontology was revised and modularized in 2015-2017 by the W3C/OGC Spatial Data on the Web Working Group, see: https://www.w3.org/2015/spatial/wiki/Semantic_Sensor_Network_Ontology.
In particular, (a) the scope is extended to include actuation and sampling; (b) the core concepts and properties are factored out into the SOSA ontology. The SSN ontology imports SOSA and adds formal axiomatization consistent with the text definitions in SOSA, and adds classes and properties to accommodate the scope of the original SSN ontology.
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