Database Reference
In-Depth Information
This paper reports on the mapping between the OpenIoT native data model,
which is the SSN-ontology, and the OGC SensorThings API model. The challenge
for this mapping is to bridge the complexity of SSN-Ontology to the simplicity
of the OGC API while maintaining as much of the information as possible.
2 Conceptual Background
2.1 OpenIoT
The OpenIoT middleware is designed to provide an open interface to integrate
heterogeneous sensor data into one common information model. This information
model is based on the standard SSN-Ontology and the sensor data are seman-
tically aligned in order to fit into this model. The main purpose is to have a
semantically enriched description of the sensor data and the context to fit these
data into a world model. The OpenIoT middleware provides services to schedule
reasoning queries to analyse the data and it provides streaming mechanisms to
feed semantically filtered live data to the client applications.
A simplified form of the data model is displayed in Fig. 1 . At the core of the
model is the observation. Each observation has an observation value containing
the actual value of the observation, an observed property describing what is
being measured, and a feature of interest, describing the object that is being
monitored. Each observation is made by a given Sensor, which has a SensorType.
Fig. 1. Simplified OpenIoT data model
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