Database Reference
In-Depth Information
The concept SensorType was introduced by OpenIoT to ease the management
of large numbers of sensors. Both the Sensor and the Feature of Interest have a
Location, which is used to store where the object is.
Besides these defined relations, each of the above introduced objects can
have custom defined relations and properties that fit the use-case for which the
OpenIoT platform is being used.
2.2 SensorThings API
The OGC SensorThings API is an OGC candidate standard for providing an
open and unified way to interconnect IoT devices, data, and applications over
the Web. The OGC SensorThings API builds on Web protocols, the OGC Sensor
Web Enablement standards and the observations and Measurements model [
5
],
and applies an easy-to-use REST-like style. (see [
2
]). The RESTful web service
interface provides the typical Create, Read, Update, and Delete (CRUD) actions
on uniquely-identifiable resources. The OGC SensorThings API is specifically
designed for the IoT but inspired by the OASIS Open Data Protocol (OData,
[
4
]), which defines a general-purpose RESTful service interface.
It is the simplicity of the SensorThings API which makes it attractive for the
OpenIoT middleware. OpenIoT provides strong reasoning and semantic stream-
ing capabilities, but the typical clients for these kinds of services are devices with
more available resources. A more light weight client might benefit from a simple
resource based interface. Together with the fact that the OGC SensorThings
API is a candidate standard, this API is expected to be a strong added value
for the OpenIoT middleware.
The OGC SensorThings API consists of two parts based around the concepts
thing and location. The Tasking Profile part deals with actuators (things that
can accept commands) while the Sensing Profile deals with sensors. At the centre
of the API (see Fig.
2
) is the concept “Thing”. Each thing can have a location
indicating where the thing is, and multiple historical locations, each with a time
property indicating when the thing was there.
Fig. 2.
The OGC SensorThings API data model. [
3
]
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