Re: Comment on the SOSA ontology

Hi Catherine,

Thanks for your additional comments. The examples on Github is a bit outdated and we are currently working on a new example. It is currently undergoing review: https://github.com/w3c/sdw/pull/891. The issue you raise regarding what is a FeatureOfInterest and what is the Property is currently being discussed in the group (see also https://www.w3.org/2015/spatial/track/actions/349). The hasProperty and isPropertyOf relations that relate a Property to a FeatureOfInterest are currently only defined in SSN, but we are considering their inclusion in the SOSA core.

The hasValue property has actually been replaced by the hasSimpleResult property which can be used to attach a value to an Observation/Actuation. If units of measurement are attached, the use of the sosa:Result class is required. For units of measurement SOSA as well as SSN are relying on external ontologies such as the QUDT. However, we will include an example how to attach a unit of measure to a sosa:Result using an external ontology such as QUDT.

Kind regards,
Armin

From: Catherine Roussey <catherine.roussey@irstea.fr>
Date: Wednesday, 10 May 2017 at 8:25 pm
To: "public-sdw-comments@w3.org" <public-sdw-comments@w3.org>
Subject: Re: Comment on the SOSA ontology
Resent-From: <public-sdw-comments@w3.org>
Resent-Date: Wednesday, 10 May 2017 at 8:26 pm


Dear all

I am some remark about the sosa example

https://github.com/w3c/sdw/blob/gh-pages/ssn/rdf/documentation_examples/sosa-core_examples.ttl


In the ssn ontology it was  clear what is a FeatureOfInterest (wind) and a Property of a FeatureOfInterest ( wind direction).
This distinction is no so easy to understand at the first reading. That why the design patern SSO is so important.
But I like very much this distinction. A temperature sensor may measure different think depending of its location (the soil, the outdoor air, the indoor air)

About the sosa example of room temperature
for me the FeatureOfInterest is a room (or buiding or indoor air), identified by one sample (a specific room 4830EH_UCSB)
and the property is the temperature (room temperature ).
In the example I think it is not so clear because I can not see where is defined  the property (temperature) .

the result of observation has no unit.
sosa-core:hasValue "23.8"^^xsd:double ;
there exist different unit about temperature celsius or degree.
Where can we find the unit of the temperature value?


Best regards
Catherine


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Catherine ROUSSEY

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