(I) AR has to do with
(1) rendering a realistic (human senses) and actionable (useful Metadata, explaining available controls e.g.) representation of the real world, and
(2) giving intuitive user interface and control, acting on real world.
(ii) For this purpose AR uses IoT, as:
-human control/partial automation /full automation
-machine to machine communication (M2M, see One M2M e. g.)
-real time scheduling, programming, operation.
Now let us start from the other end with
(a) IoT
To plan, operate, evolve IoT systems, a digital twin "model", "showing conviently" system parameters and states as they happen, can be used.
Such digital twins can be interacted with efficiently in an augmented reality environment (see ETSI-ISG-ARF which builds and standardises an augmented reality framework).
This brings about:
(b) AR/ARF
We have shown above first a path from AR to IoT, and second a path from IoT to AR.
We have mentioned industry standards families supporting these.
Hope this helps. Let me know
Since the IoT addresses the connection of physical objects (things) and virtual representations, there certainly is a great number of operation scenarios for the combined use of IoT and AR. - Renaud already mentioned interesting aspects.
AR offers the possibility to make things visible (e.g., a computing device behind the wall), show where things are (e.g. to locate a car with a built-in sensor or to find an animal with a transponder), to display additional information (e.g. virtual text labels giving information about the battery level of a IoT device), might offer user interfaces (as Renaud already said) and much more...
However, in the IoT context the design of a AR applications requires a spatial concept. This is an interesting subject for me as a geoinformation scientist.
I am looking forward to more answers to the question.
Regards, Benno
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