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Introduction
The Open Geospatial Consortium OGC Sensor Web Enablement SWE activity, is being executed through the OGC Web Services OWS initiatives under the
Interoperability Program. The SWE initiatives are establishing the interfaces and protocols that will enable a “Sensor Web” through which applications and services will
be able to access sensors of all types over the Web. These initiatives have defined, prototyped and tested several foundational components needed for Sensor Web
Enablement, namely:
1. Sensor Model Language SensorML – The general models and XML
encodings for sensors and observation processing. SensorML originated under OWS 1.1, was significantly enhanced under OWS 1.2, OWS 3, and
OWS 4 Initiatives.
2. Observations Measurements OM - The general models and XML
encodings for sensor observations and measurements. OM originated under OWS 1.1 and was significantly enhanced under OWS 1.2, OWS 3,
and OWS 4.
3. TransducerML TML – A model and encoding for streaming
multiplexed data from a sensor system, and for describing the system and data encoding. Developed initially by the IRIS Corporation, this service is
being brought into the OGC SWE framework and has undergone further development as part of the OWS 3 and OWS 4 Initiatives.
4. Sensor Observation Service SOS – A service by which a client can
obtain observations from one or more sensorsplatforms can be of mixed sensorplatform types. Clients can also obtain information that describes
the associated sensors and processes. This service originated under OWS 1.1 and was significantly enhanced under OWS 1.2, OWS 2, OWS 3, and
OWS4.
5. Sensor Planning Service SPS – A service by which a client can
determine collection feasibility for a desired set of collection requests for one or more mobile sensorsplatforms, or a client may submit collection
requests directly to these sensorsplatforms. This service was defined under OWS 1.2 and enhanced under OWS 3 and OWS 4.
6. Sensor Alert Service SAS – A service for advertising, subscribing to,
and publishing alerts to alert listener clients. This service is being defined under the Sensor Alert Service Interoperability Experiment and enhanced
under the OWS 4 Initiative.
7. Web Notification Service WNS – A service by which a client may
