Skip to content
Snippets Groups Projects
Commit 227f5b4e authored by Andreas Neubacher's avatar Andreas Neubacher
Browse files

Editorial changes: Corrected incorrect code for Figures

parent 2064e27c
No related branches found
No related tags found
1 merge request!8SDS-2024-0133-TS-0041-SensorThings_interworking-v5_1_0_baseline
Pipeline #1171 passed
![logo](media/image1.png)
![~~CPTION~~](media/image1.png)
|oneM2M<br/>Technical Specification |oneM2M<br />Technical Specification |
|-|-|
......@@ -139,20 +139,18 @@ The key words "Shall", "Shall not", "May", "Need not", "Should", "Should not" in
# 5 Introduction to OGC SensorThings API
The SensorThings API (STA) is a standard of the Open Geospatial Consortium (OGC). It provides a framework for communication and exchanging data between sensors and applications. The standard is devided in two parts. SensorThings API Part 1 is dedicated to sensing and was published in 2016 and updated in 2021 <a href="#_ref_1">[1]</a>.
The SensorThings API (STA) is a standard of the Open Geospatial Consortium (OGC). It provides a framework for communication and exchanging data between sensors and applications. The standard is devided in two parts. SensorThings API Part 1 is dedicated to sensing and was published in 2016 and updated in 2021.
A STA-based architecture works in client/server mode. A sensor device pushes data to the SensorThings Server via HTTP. A SensorThings Server may also support MQTT protocol to support publish and subscribe capabilities. An interested application can subscribe to the MQTT-Broker, in order to get notified about new sensor events.
<figure>
<img src="media/STA_flow.png" alt="STA_message_flow">
<figcaption>Figure 5-1 STA message flow</figcaption>
</figure>
![Figure 5-1 STA message flow](media/STA_flow.png)
The data in the SensorThings server are organized as according to **Sensing Entities** (see Figure 5-2: Sensing Entities data model <a href="#_ref_1">[1]</a>).
**Figure 5-1 STA message flow**
<figure>
<img src="media/data_model.jpg" alt="data_model">
<figcaption>Figure 5-2 STA Sensing Entities Data Model <a href="#_ref_1">[1]</a></figcaption>
</figure>
The data in the SensorThings server are organized as according to **Sensing Entities** (see Figure 5-2: Sensing Entities data model.
![Figure 5-2 STA Sensing Entities Data Model](media/data_model.jpg)
**Figure 5-2 STA Sensing Entities Data Model**
In the Sensing Entities Data Model events or sensor data are called "observations". Before a sensor is able to push an observation to the server it needs at least a 'Thing' and a 'Datastream' entity. This has to be created beforehand. One 'Thing' might have different 'Sensors', one 'Location' or many 'HistoricalLocations'.
......@@ -171,10 +169,9 @@ Figure 6.0-1 shows an architecture approach for an Interworking Proxy Entity (IP
The basic interworking enables applications that are connected to an oneM2M-based system to get data from sensors that are connected to an OGC/STA server. Furthermore, an application that is connected to an OGC/STA server will be able to get data from sensors that are connected to an oneM2M-based system.
<figure>
<img src="media/STA_oneM2M_architekturbild_01.svg" alt="arch_overview">
<figcaption>Figure 6.0-1: IPE architecture overview</figcaption>
</figure>
![Figure 6.0-1: IPE architecture overview](media/STA_oneM2M_architekturbild_01.svg)
**Figure 6.0-1: IPE architecture overview**
## 6.1 OGC/STA-to-oneM2M Data Model Mapping
......@@ -184,11 +181,9 @@ According to oneM2M TS-0033 <a href="#_ref_2">[2]</a> a representation of a non-
The IPE shall map the 'result' attribute of an OGC/STA 'Observation' to the 'content' attribute of a oneM2M &lt;contentInstance&gt;, and vice versa as shown in Figure 6.1-1.
<figure>
<img src="media/data_mapping.svg" alt="data_mapping">
<figcaption>Figure 6.1-1: OGC / STA-to-oneM2M data model mapping</figcaption>
</figure>
![Figure 6.1-1: OGC / STA-to-oneM2M data model mapping](media/data_mapping.svg)
**Figure 6.1-1: OGC / STA-to-oneM2M data model mapping**
<mark>The following text is to be used when appropriate:</mark>
......
0% Loading or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment