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Re: Observations and Measurement - draft

From: Luis Bermudez <lbermudez@opengeospatial.org>
Date: Mon, 12 Mar 2012 13:26:05 -0400
Cc: "'Thomas, George \(OS/ASA/OCIO/OEA\)'" <George.Thomas1@hhs.gov>, "'Dan Gillman'" <Gillman.Daniel@bls.gov>, 'Benedikt Kämpgen' <kaempgen@fzi.de>, <public-gld-wg@w3.org>, "'Ralph Hodgson'" <Ralph.Hodgson@nasa.gov>
Message-Id: <5E4AE2FD-5901-40C9-9847-3A7BBF862835@opengeospatial.org>
To: "Irene Polikoff" <irene@topquadrant.com>
Irene, Ralph and WG

Excellent. QUDT is a good example of units encoded in an ontology that can be used in O&M. 

If we were to recommend the use of this units ontology, then we should point to the units vocabulary [1], where for example Kelvin is identified as http://qudt.org/vocab/unit#Kelvin.


[1] http://qudt.org/1.1/vocab/OVG_units-qudt-(v1.1).ttl


Luis
-------------
Luis Bermudez
lbermudez@opengeospatial.org  
+1 (301) 760-7323 

The OGC: Making Location Count...
http://www.opengeospatial.org/contact




On Mar 12, 2012, at 12:57 PM, Irene Polikoff wrote:

> Ralph Hodgson who leads QUDT effort sent an e-mail to the list regarding
> QUDT, but his message never got posted. I am repeating the content of the
> e-mail below:
> 
> I am the ontology lead for NASA's QUDT work.  QUDT stands for 'Quantities,
> Units, Dimensions and Types'. 
> 
> QUDT has a website at http://qudt.org and catalog pages at
> http://www.linkedmodel.org/catalog/qudt/1.1/index.html, where you can
> download OWL models (schemas) and vocabularies. 
> 
> QUDT has both a simple representation of units and a full dimensional
> treatment. Using dimensions the ontology can compute quantities from
> quantity expressions. For example, you can ask what is the quantity I get if
> I multiply a mass and an acceleration. Using rules over dimensions, the
> ontology will answer 'Force'.
> 
> QUDT can be browsed using SPIN Services - an ontology driven user interface
> approach based on "SPARQL Web Pages".  You can use this link as an example -
> http://spinservices.org:8080/spin/doc.swp?baseURI=http://qudt.org/1.1/vocab/
> dimensionalunit
> 
> QUDT will become a NASA Handbook this year.  We are working on a new release
> of QUDT that will have substantially more systems of quantities and both
> RDF/OWL and XML representations. We will also have support for measurements,
> observations and calibrations.
> 
> This will be release 2.0 because of changes we are doing on URIs.
> 
> Irene Polikoff 
> Mobile Phone: +1 914-329-8576
> CEO, www.topquadrant.com, @TopQuadrant
> Voyages of the Semantic Enterprise
> Trainings: Introduction to Semantic Web Technologies: What They are and How
> to Use Them - Next Class, March 5-8, 2012;
> TopBraid Suite Advanced Product Training - Next Class, May 21-24 , 2012
> 
> 
> 
> -----Original Message-----
> From: Thomas, George (OS/ASA/OCIO/OEA) [mailto:George.Thomas1@hhs.gov] 
> Sent: Monday, March 12, 2012 10:01 AM
> To: Luis Bermudez; Dan Gillman
> Cc: Benedikt Kämpgen; public-gld-wg@w3.org
> Subject: Re: Observations and Measurement - draft
> 
> At the GLD-WG F2F1 [1] a presentation was given by TopQuadrant [2] on
> 'Linked Data Models' [3], which mentions a number of interesting
> ontologies including QUDT [4] that might be of interest here.
> 
> -g
> 
> [1] http://www.w3.org/2011/gld/wiki/F2F1
> [2] http://www.topquadrant.com/
> [3] 
> http://www.topquadrant.com/resources/Internal%20Presentations/TQ%20-%20Link
> edModels.ppt
> [4] http://qudt.org/
> 
> On 3/9/12 9:55 AM, "Luis Bermudez" <lbermudez@opengeospatial.org> wrote:
> 
>> Hi Dan
>> 
>> Good questions.
>> 
>> Observation and Measurement  (O&M)  is the overall container for
>> different concepts related to observations: Procedure, Property, Feature
>> of Interest and Result. I recently learned that there is an O&M ontology
>> [2] developed by CSIRO. Simon Cox is the editor of O&M and he also
>> developed this ontology. I think it is fairly new so I do not think there
>> are a lot of examples out there. However some examples of O&M in XML can
>> be found at the OGC Schemas repositories [1]. This can help clarify what
>> you can do with O&M. O&M also provides details of how the result can be
>> expressed depending on the result type. For example the ontology has
>> subclasses based on the type of observation, such as CategoryObservation,
>> CountObservations and GeometryObservation.
>> 
>> The Result not only contains the values but also the units of measure.
>> Dealing with Units of Measure is at another level and should be treated
>> separately. A units of measure ontology should contain enough information
>> that lets you know how to make conversions from one unit to another, or
>> if two values can be comparable. Similarly, the same applies for the
>> other main  components of O&M, like Feature of Interest or Procedure.
>> They should all have specialize ontologies. For example different
>> ontologies can exist and be plugged in that properly describe procedures
>> for statistical methods, numerical models or sensors.
>> 
>> Within OGC there are two ways to express Units of Measure: 1) via URIs,
>> defined in an ontology or 2) using UCUM [3]. UCUM is very well designed.
>> It is based on base units and nomenclature that can be use to express all
>> the other units. It has also an API. I know ontolog [4] also worked on a
>> units ontology and they looked at UCUM. I'm not sure about the status of
>> the ontolog work but I can ask. I also know that UCUM deals with the
>> dimension issue you mentioned. See specification, Section 3 semantics [5]
>> and example for Healthcare Units [6].
>> 
>> 
>> [1] http://schemas.opengis.net/om/2.0/examples/
>> [2] http://def.seegrid.csiro.au/ontology/isotc211/om
>> [3] http://unitsofmeasure.org/
>> [4] http://ontolog.cim3.net/cgi-bin/wiki.pl?UoM_Ontology_Standard
>> [5] http://aurora.regenstrief.org/~ucum/ucum.html
>> [5] http://www.hl7.de/download/documents/ucum/ucumdata.html
>> 
>> Best Regards,
>> 
>> Luis
>> -------------
>> Luis Bermudez
>> lbermudez@opengeospatial.org
>> +1 (301) 760-7323 
>> 
>> The OGC: Making Location Count...
>> http://www.opengeospatial.org/contact
>> 
>> 
>> 
>> 
>> On Mar 8, 2012, at 5:09 PM, Gillman, Daniel - BLS wrote:
>> 
>>> Luis,
>>> 
>>> In this Observation and Measurement scheme, is there a way to record
>>> equivalent units of measure?  Suppose I am measuring the speed of a car
>>> using a radar gun on some road at a dangerous curve where people usually
>>> drive too fast, and the radar gun reports the speed in miles per hour.
>>> Then, suppose someone else repeats the experiment using the same radar
>>> gun, but the machine is set to report kilometers per hour instead.  How
>>> do we know that all data reported in mph can be converted to data in
>>> kph, and vice-versa?
>>> 
>>> The ISO/IEC 11179 standard
>>> (http://standards.iso.org/ittf/PubliclyAvailableStandards/index.html)
>>> introduced the notion of dimensionality, the name coming from the
>>> dimensional analysis that scientists use to convert units of measure.
>>> However, this takes a wider view to include units of measure that are
>>> not a part of the scientific set, and the idea doesn't depend on the
>>> faux algebra of cancelling the same units in numerator and denominator.
>>> 
>>> Dimensionality depends chiefly on the set of operations, very similar
>>> to datatypes, that data in a unit of measure are allowed.  Take
>>> temperatures measured in degrees Celsius.  One can subtract them, take
>>> averages and similar statistics, but scalar multiplication makes no
>>> sense.  For instance, twice 10C is not 20C.  Therefore, data in degrees
>>> Fahrenheit are convertible to Celsius, since they share the same
>>> operations.  Interestingly, under this definition, Kelvin is not an
>>> equivalent measuring system, and that is because scalar multiplication
>>> makes sense in Kelvin.
>>> 
>>> Yours,
>>> Dan
>>> 
>>> 
>>> Dan Gillman
>>> Bureau of Labor Statistics
>>> Office of Survey Methods Research
>>> 2 Massachusetts Ave, NE
>>> Washington, DC 20212 USA
>>> Tel     +1.202.691.7523
>>> FAX    +1.202.691.7426
>>> Email  Gillman.Daniel@BLS.Gov
>>> -----------------------------------------
>>> "He has all the virtues I dislike
>>> and none of the vices I admire."
>>> - Winston Churchill
>>> ------------------------------------------
>>> 
>>> 
>>> 
>>> -----Original Message-----
>>> From: Luis Bermudez [mailto:lbermudez@opengeospatial.org]
>>> Sent: Thursday, March 01, 2012 11:10 AM
>>> To: Benedikt Kämpgen
>>> Cc: public-gld-wg@w3.org
>>> Subject: Observations and Measurement - draft
>>> 
>>> All,
>>> 
>>> Comments about Observations and Measurement related to:
>>> 
>>> - Section: Publishing Statistical Data
>>> - http://www.w3.org/2011/gld/track/issues/32
>>> - @@TODO: Are there any statements about compatibility and
>>> interoperability between O&M and Data Cube that can be made to give
>>> guidance to such organizations?
>>> 
>>> Suggest to use Observations and Measurements (OM) model.
>>> 
>>> An Observation is an event whose result is an estimate of the value of
>>> some property of a feature of interest, obtained using a specified
>>> procedure.
>>> 
>>> An Observation has essentially the following parts:
>>> 
>>> Procedure: e.g. person, sensor, observatory, model, macro.
>>> Property: e.g. temperature, color, weight.
>>> Feature of Interest: e.g. body, world, Washington DC, banana, specimen
>>> 123, Monterey Bay.
>>> Result: The actual value. Includes categories and quantities results,
>>> time series, multimedia (video, audio), one single value, a file, etc.
>>> 
>>> So in the figure: "Modeling quantity, measurement, observation" we can
>>> do the following:
>>> 
>>> Add Procedure, Result, Feature of Interest and Property Model Person as
>>> a type of Procedure Remove Measurement Category and Quantity are
>>> subclass of result.
>>> Phenomenon Type is same as Property
>>> 
>>> 
>>> Luis
>>> -------------
>>> Luis Bermudez
>>> lbermudez@opengeospatial.org
>>> +1 (301) 760-7323
>>> 
>>> The OGC: Making Location Count...
>>> http://www.opengeospatial.org/contact
>>> 
>>> 
>>> 
>>> 
>>> On Feb 22, 2012, at 11:38 AM, Benedikt Kämpgen wrote:
>>> 
>>>> Hello,
>>>> 
>>>> We have further refined the Data Cube use cases and copied the content
>>>> from the wiki into an Editor's Draft for "Use Cases and Requirements
>>>> for the Data Cube Vocabulary" [1].
>>>> 
>>>> Feedback of any kind would be well appreciated.
>>>> 
>>>> Best,
>>>> 
>>>> Benedikt
>>>> 
>>>> [1] 
>>>> <http://dvcs.w3.org/hg/gld/raw-file/default/data-cube-ucr/index.html>
>>>> 
>>>> 
>>>> 
>>>> --
>>>> AIFB, Karlsruhe Institute of Technology (KIT)
>>>> Phone: +49 721 608-47946
>>>> Email: benedikt.kaempgen@kit.edu
>>>> Web: http://www.aifb.kit.edu/web/Hauptseite/en
>>>> 
>>>> 
>>>> 
>>>> 
>>>> 
>>> 
>>> 
>>> 
>>> 
>> 
>> 
> 
> 
> 
Received on Monday, 12 March 2012 17:26:35 UTC

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