Fwd: A unit of measurement as a measuring property

Forwarding response from one of our students using SSN.
Amit

Amit Sheth  Home Page<http://knoesis.org/amit> G+<https://plus.google.com/u/0/104549534994875594081/> Twitter<http://twitter.com/amit_p> Blog<http://amitsheth.blogspot.com/> LinkedIn<http://www.linkedin.com/in/amitsheth> About.Me<http://about.me/amitsheth>
Exec. Dir., Ohio Center of Excellence in Knowledge-enabled Computing (like Kno.e.sis on FB<http://www.facebook.com/kno.e.sis>)
LexisNexis Ohio Eminent Scholar, Wright State University

Begin forwarded message:

From: Riccardo Tommasini <tomma156@gmail.com<mailto:tomma156@gmail.com>>
Subject: Re: A unit of measurement as a measuring property
Date: October 7, 2015 at 11:59:25 AM EDT
To: "Sheth, Amit" <amit.sheth@wright.edu<mailto:amit.sheth@wright.edu>>


There are many alternative solutions to represent the unit of measurements of a Property in SSN. They have  different constrains and characteristics.

Starting from the definition of ssn:Property, an observable Quality of an Event or Object.
There are the options:
1) Attach the unit of measurements to the ssn:ObservationValue class, the information will be replicated for any instance of the value. e.g [1]

2) Attach the unit of measurements to the sensor by exploiting the Measurement Capabilities class:  the information will be available for each sensor instance. Look at [2].

3) Attaching it to the sun:Property class, by defining an object property. I don’t recommend this option since it is not flexible and the ontology will be hard to be extended.


[1] http://www.w3.org/2005/Incubator/ssn/wiki/SSN_Smart_product

[2] http://www.w3.org/2005/Incubator/ssn/wiki/SSN_Sensor



Begin forwarded message:

From: Maxim Kolchin <kolchinmax@gmail.com<mailto:kolchinmax@gmail.com>>
Subject: A unit of measurement as a measuring property
Date: October 7, 2015 at 10:35:54 AM EDT
To: public-xg-ssn@w3.org<mailto:public-xg-ssn@w3.org>
Resent-From: <public-xg-ssn@w3.org<mailto:public-xg-ssn@w3.org>>

Hi,

Context: I have a sensor which observes the temperature of the air in
Celsius. And I want to represent these facts with SSN.

example:sensor-0 a ssn:SensingDevice ;
  ssn:observes example:AirTemperature .

Above the triples representing the sensor and the fact that it
observes the air temperature. Since normally (or usually) a sensor
uses the same unit of measurement, it's useful to represent it in its
description.

Question: How to represent using SSN ontology the fact that the sensor
observes the temperature in Celsius? Using a measuring property, e.g.
create an subclass of ssn:MeasurementProperty with name
example:UnitOfMeasurement?

Thank you in advance!
Maxim Kolchin
PhD Student @ ITMO University (National Research University)
E-mail: kolchinmax@gmail.com<mailto:kolchinmax@gmail.com>
Tel.: +7 (911) 199-55-73
Homepage: http://kolchinmax.ru<http://kolchinmax.ru/>