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Re: Observations and Measurement - draft

From: Thomas, George (OS/ASA/OCIO/OEA) <George.Thomas1@hhs.gov>
Date: Mon, 12 Mar 2012 10:00:46 -0400
To: Luis Bermudez <lbermudez@opengeospatial.org>, Dan Gillman <Gillman.Daniel@bls.gov>
CC: Benedikt Kämpgen <kaempgen@fzi.de>, "public-gld-wg@w3.org" <public-gld-wg@w3.org>
Message-ID: <CB837901.321DB%george.thomas1@hhs.gov>
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.


[1] http://www.w3.org/2011/gld/wiki/F2F1
[2] http://www.topquadrant.com/
[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 Bermudez
>+1 (301) 760-7323 
>The OGC: Making Location Count...
>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
>>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
>> 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 14:08:58 UTC

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