Re: [core] [SenML] Multiple values in a measurement

Michael Koster <michaeljohnkoster@gmail.com> Wed, 07 November 2018 17:38 UTC

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From: Michael Koster <michaeljohnkoster@gmail.com>
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Date: Wed, 7 Nov 2018 09:38:01 -0800
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To: Shantanoo Desai <des@biba.uni-bremen.de>
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Subject: Re: [core] [SenML] Multiple values in a measurement
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Here is one possibility:

[
  {
    "bn": "inertialmeasurement",
    "bu": "rad/s",
    "n": "xvalue",
    "v": 0.34,
  },
  {
    "n": "yvalue",
    "v": 1.43,
  },
  {
    "n": "zvalue",
    "v": 0.23,
  }
]

Or as an IPSO Smart Object representationfor the accelerometer object type (3313):

[
  {
    "bn": "3313/0/",
    "n": "5701",
    "vs": "rad/s",
  },
  {
    "n": "5702",
    "v": 0.34
 },
  {
    "n": "5703",
    "v": 0.34
 },

  {
    "n": "5704",
    "v": 0.34
 }
]


On Oct 18, 2018, at 1:35 AM, Shantanoo Desai <des@biba.uni-bremen.de>; wrote:
> 
> Hello all,
>  
> In a practical scenario there are sensors that provide more than one values, for e.g., an Inertial Measurement Unit (IMU) will provide Euler Angles as Yaw, Pitch, Roll indicating orientation of the sensor node or an Accelerometer which measures linear acceleration in X, Y, Z directions.
>  
> Is there any schematic in SenML that would support multiple values?
>  
> From my understanding there is none and most values are indicated by the field “v” as a single key:value pair in JSON.
>  
> <image006.png>
>  
> Even if I split the reading into three, there might not be clear distinction since “n” always remains the same (the sensor name is always “inertialmeasurement”)
>  
> <image007.png>
>  
>  
> Is there a way to inculcate such features into senML or is there a way around this that I have overlooked?
>  
>  
>  
> Mit freundlichen Grüßen
>  
> 
> i. A. M.Sc. Shantanoo Desai
> Wissenschaftlicher Mitarbeiter
>  
> BIBA - Bremer Institut für Produktion und Logistik GmbH
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