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The Semantic Sensor Network (SSN) ontology is an ontology for describing sensors and their observations, the involved procedures, the studied features of interest, the samples used to do so, and the observed properties, as well as actuators. SSN follows a horizontal and vertical modularization architecture, with the core classes and properties defined using minimal axiomatization in a graph called SOSA (Sensor, Observation, Sample, and Actuator) supplemented with additional axiomatization and terms in further graphs. These allow SSN to support a wide range of applications and use cases, including satellite imagery, large-scale scientific monitoring, industrial and household infrastructures, social sensing, citizen science, observation-driven ontology engineering, and the Web of Things.
The namespace for the core terms is http://www.w3.org/ns/sosa/
.
The suggested prefix for the SOSA namespace is sosa
.
The SOSA graph containing the core definitions is available at http://www.w3.org/ns/sosa/.
The SSN graph with the full axiomatization of the core terms is available at http://www.w3.org/ns/ssn/.
General Information
For OGC this is a Public Draft of a document prepared by the Spatial Data on the Web Working Group (SDWWG) — a joint W3C-OGC project (see charter). The document is prepared following W3C conventions. The document is released at this time to solicit public comment.
This section introduces the specifications for the RDF implementation of the Semantic Sensor Network Ontology.
This section provides details on modules that extend the scope and capabilities of SSN.
This section introduces the specifications for the modules that align SOSA and SSN to a variety of related ontologies and specifications.
This section discusses how to handle some common modeling questions.
Results of the wide review of SOSA and SSN is summarized here.
The editors recognize the major contribution of the members of the original W3C Semantic Sensor Networks Incubator Group. The editors also gratefully acknowledge the contributions made to this document by all members of the SSN subgroup of the Spatial Data on the Web working group.
For this new edition of SSN, in addition to the contributors listed at the top of the document, the editors acknowledge the work of the editors of ISO 19156:2023 [[OMS]].
A full change-log is available on GitHub.