RE: ssn: action-155

It seems to me that this discussion is now approaching something that could be built.  However, we need to  prioritise fixing down  the FPWD very shortly.  So there may be enough of a "thing" right now to write into the editor's draft. And indeed something rather like this was already written several weeks ago (thanks Armin), in http://w3c.github.io/sdw/ssn/ (see section "modularisation")  but escaped comment entirely.  So, in the short term, it would be really helpful if you could look at what is there already and make very specific suggestions about what needs to be changed, if anything. This is urgent.

The other option is to remove that section entirely from FPWD, which is where I thought we had to go earlier this week.

We also need the documentation around SSN as it is now, (as in SSN-minus-DUL) that Danh is working on. And a bit of polishing and we might get there!

Furthermore, please do explain your ideas and ontology fragments (or whole SSN rewritten ) on the wiki: https://www.w3.org/2015/spatial/wiki/Proposals_for_rewriting_SSN  . This is not so urgent  but would be our next job after FPWD is out.

-Kerry




From: Le Phuoc, Danh [mailto:danh.lephuoc@deri.org]
Sent: Wednesday, 11 May 2016 7:05 PM
To: janowicz@ucsb.edu; p.barnaghi@surrey.ac.uk; Simon.Cox@csiro.au; Kerry Taylor <kerry.taylor@anu.edu.au>; public-sdw-wg@w3.org
Subject: Re: ssn: action-155

Hi Krzysztof,

I think it's the right way to eventually, so, I'm happy to contribute, feel free to assign actions to me.

Best,

Danh

From: Krzysztof Janowicz <janowicz@ucsb.edu<mailto:janowicz@ucsb.edu>>
Reply-To: "janowicz@ucsb.edu<mailto:janowicz@ucsb.edu>" <janowicz@ucsb.edu<mailto:janowicz@ucsb.edu>>
Date: Tuesday 10 May 2016 23:35
To: "p.barnaghi@surrey.ac.uk<mailto:p.barnaghi@surrey.ac.uk>" <p.barnaghi@surrey.ac.uk<mailto:p.barnaghi@surrey.ac.uk>>, "Simon.Cox@csiro.au<mailto:Simon.Cox@csiro.au>" <Simon.Cox@csiro.au<mailto:Simon.Cox@csiro.au>>, "kerry.taylor@anu.edu.au<mailto:kerry.taylor@anu.edu.au>" <kerry.taylor@anu.edu.au<mailto:kerry.taylor@anu.edu.au>>, "public-sdw-wg@w3.org<mailto:public-sdw-wg@w3.org>" <public-sdw-wg@w3.org<mailto:public-sdw-wg@w3.org>>
Subject: Re: ssn: action-155
Resent-From: <public-sdw-wg@w3.org<mailto:public-sdw-wg@w3.org>>
Resent-Date: Tuesday 10 May 2016 23:44

Hi Payam,

Yes, help would be very much appreciated. I will email around a draft shortly. There are in fact many controlled vocabularies for sensor types and measurement types that we could refer to (e.g., http://www.bodc.ac.uk/products/web_services/vocab/ "101; anemometers; Instrument that measures wind speed and direction at a single elevation." to give just one example).

Best,
Krzysztof

On 05/10/2016 03:26 PM, p.barnaghi@surrey.ac.uk<mailto:p.barnaghi@surrey.ac.uk> wrote:

That would be great; I am also happy to help. NASA's sweet ontology has a vocabulary for units of measurement but I haven't come across any for sensor types

and other vocabularies.
OntoSensor may cover some of the vocab/concepts: https://marinemetadata.org/conventions

Thanks,
Payam
________________________________
From: Krzysztof Janowicz <janowicz@ucsb.edu><mailto:janowicz@ucsb.edu>
Sent: 10 May 2016 23:07
To: Barnaghi P Dr (Elec Electronic Eng); Simon.Cox@csiro.au<mailto:Simon.Cox@csiro.au>; kerry.taylor@anu.edu.au<mailto:kerry.taylor@anu.edu.au>; public-sdw-wg@w3.org<mailto:public-sdw-wg@w3.org>
Subject: Re: ssn: action-155

Thanks. I can work out a small set of axioms for such common core and then we can see whether this is an interesting route to take or not.

On 05/10/2016 03:04 PM, p.barnaghi@surrey.ac.uk<mailto:p.barnaghi@surrey.ac.uk> wrote:

I totally agree with Krzysztof's idea of creating a core ontology/vocabulary. Once we have good models we still need common models to

specify the data for those models; for example common types of sensors, observation types etc.

There are several works on creating ontology models but few on common ontologies (or at least I am not aware of).

Best, Payam

________________________________
From: Krzysztof Janowicz <janowicz@ucsb.edu><mailto:janowicz@ucsb.edu>
Sent: 10 May 2016 21:45
To: Simon.Cox@csiro.au<mailto:Simon.Cox@csiro.au>; kerry.taylor@anu.edu.au<mailto:kerry.taylor@anu.edu.au>; public-sdw-wg@w3.org<mailto:public-sdw-wg@w3.org>
Subject: Re: ssn: action-155

As discussed before, I believe that om-lite should be integrated with the current SSN. In fact, I still strongly believe that we need to develop a simple core ontology/vocabulary around central notions such as sensor and observations that can be used for simple, everyday linked data and acts as interfaces/hooks for other SSN modules.

Krzysztof


On 05/09/2016 06:06 PM, Simon.Cox@csiro.au<mailto:Simon.Cox@csiro.au> wrote:
FWIW All classes and most properties in om-lite have reasonably precise definitions in rdf:comment and dct:description properties.  Not formally axiomatized, but a lot more than just labels. For example oml:Observation is described:

An observation is an act associated with a discrete time instant or period through which a number, term or other symbol is assigned to a phenomenon [2]. It involves application of a specified procedure, such as a sensor, instrument, algorithm or process chain. The procedure may be applied in-situ, remotely, or ex-situ with respect to the sampling location. The result of an observation is an estimate of the value of a property of some feature. Use of a common model allows observation data using different procedures to be combined unambiguously.

The observation itself is also a feature, since it has properties and identity.

Observation details are important for data discovery and for data quality estimation.

The observation could be considered to carry metadata about an instance of a property (of the feature of interest). This property-value metadata complements the dataset and feature metadata that have been conventionally considered (e.g. ISO 19115).

The values for the properties 'procedure', 'featureOfInterest', 'observedProperty', 'phenomenonTime', 'resultTime' may be inherited from a container resource.

See http://def.seegrid.csiro.au/ontology/om/om-lite#Observation

Simon

From: Krzysztof Janowicz [mailto:janowicz@ucsb.edu]
Sent: Tuesday, 10 May 2016 5:29 AM
To: Kerry Taylor <kerry.taylor@anu.edu.au><mailto:kerry.taylor@anu.edu.au>; public-sdw-wg@w3.org<mailto:public-sdw-wg@w3.org>
Subject: Re: ssn: action-155

Hi Kerry,

Sure. One of the reasons to include DUL in the original SSN was the need for a stronger semantic anchoring of the classes and relationships defined in SSN. One problem we faced was that terms such as Sensor, System, Observation, were under-specific to a degree where a major part of the intended interpretation of these classes was encoded in terms of their labels. DUL gave us additional axioms to further refine what was meant by 'Sensor', 'Observation' and so forth. Removing DUL, will leave us with the same problem as we had before, and, thus, I proposed to make use of the power of OWL2 to add a stronger axiomatic foundation to SSN (classes).

Best,
Krzysztof



On 05/09/2016 05:20 AM, Kerry Taylor wrote:
Krzysztof,
https://www.w3.org/2015/spatial/track/actions/155


Could you please address this remark you made in an ssn meeting some time ago? I read it as a suggestion for a major ssn rewrite, but perhaps it  is a suggestion for an extension instead?  Or something else?  It is sitting on this page https://www.w3.org/2015/spatial/wiki/SSN_Tasks  at present but maybe it deserves attention as one of these proposals on the wiki here https://www.w3.org/2015/spatial/wiki/Proposals_for_rewriting_SSN?  If nothing better can  you please explain it on the list so we can handle it appropriately and write it off the "task list" if appropriate?

Thanks,
Kerry




--

Krzysztof Janowicz



Geography Department, University of California, Santa Barbara

4830 Ellison Hall, Santa Barbara, CA 93106-4060



Email: jano@geog.ucsb.edu<mailto:jano@geog.ucsb.edu>

Webpage: http://geog.ucsb.edu/~jano/<http://geog.ucsb.edu/%7Ejano/>

Semantic Web Journal: http://www.semantic-web-journal.net




--

Krzysztof Janowicz



Geography Department, University of California, Santa Barbara

4830 Ellison Hall, Santa Barbara, CA 93106-4060



Email: jano@geog.ucsb.edu<mailto:jano@geog.ucsb.edu>

Webpage: http://geog.ucsb.edu/~jano/<http://geog.ucsb.edu/%7Ejano/>

Semantic Web Journal: http://www.semantic-web-journal.net




--

Krzysztof Janowicz



Geography Department, University of California, Santa Barbara

4830 Ellison Hall, Santa Barbara, CA 93106-4060



Email: jano@geog.ucsb.edu<mailto:jano@geog.ucsb.edu>

Webpage: http://geog.ucsb.edu/~jano/<http://geog.ucsb.edu/%7Ejano/>

Semantic Web Journal: http://www.semantic-web-journal.net




--

Krzysztof Janowicz



Geography Department, University of California, Santa Barbara

4830 Ellison Hall, Santa Barbara, CA 93106-4060



Email: jano@geog.ucsb.edu<mailto:jano@geog.ucsb.edu>

Webpage: http://geog.ucsb.edu/~jano/

Semantic Web Journal: http://www.semantic-web-journal.net