Dear David, (01)
> Well stated. I think it's key to layer these ontologies. If I could
> restate and add one, starting from the lowest working up, I think we
> need:
>
> 1) Values with Units (this is the very basic ontology that just allows
> us to say "3 meters") (02)
[MW] Of course everyone (well at least most people) outside the US will want
to say "3 metres" and have it understood as the same thing :-) (03)
Regards (04)
Matthew West
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> 2) The measurement event (this just adds the temporal dimension, and
> recognizes that there is an event for the measurement)
> 3) The measurement method
> 4) The thing being measured
>
> Each can be underspecified at the lower level (i.e. I could have a
> measurement event at level 2 and say it's measuring "blood pressure" (a
> literal) without having a complete ontology about what blood pressure
> is (at level 4)
>
> And as I think you were suggesting to make progress let's focus on
> level 1
>
> > -----Original Message-----
> > From: uom-ontology-std-bounces@xxxxxxxxxxxxxxxx [mailto:uom-ontology-
> > std-bounces@xxxxxxxxxxxxxxxx] On Behalf Of John Graybeal
> > Sent: Friday, July 17, 2009 4:32 PM
> > To: uom-ontology-std
> > Subject: Re: [uom-ontology-std] retitled: magnitude of a quantity
> >
> > On Jul 16, 2009, at 3:56 PM, David Leal wrote:
> >
> > > This introduces a larger point which we have only just touched
> upon,
> > > which is how these domain specific, and often measurement method
> > > specific categories are included in the ontology.
> >
> >
> > To make sure I understand this point, allow me to start with an
> > example.
> >
> > In dealing with measurements of things like chlorophyll, Roy Lowry
> and
> > his team at BODC/NERC have come up with extensive vocabularies that
> > take into account the mechanism by which a measurement was made (by
> > evaporation, by 10um filtration, by 100um filtration, by in-situ
> > reflectance, ...). The theory is that for the measurements to be
> > comparable, the technique has to be known and comparable (if not
> > identical).
> >
> > On the one hand, I firmly believe (a) it is important to track
> > provenance of measurements, and (b) it is important to be able to
> > document the measurement mechanism supported by a given device. So I
> > understand that descriptives about the measurement technique belong
> > in, say, a device ontology, or a description of the data set.
> >
> > On the other hand, they seem clearly orthogonal to the question of
> > describing what is being measured (e.g., chlorophyll), and in turn
> > even further from the units used to quantify the measurement (grams,
> > or liters, or whatever). I don't think our ontology has to qualify
> > what the units apply to, on the theory that an ounce is somehow a
> > different quantify when applied to gold and lead.
> >
> > So now I'm thinking that you mean something else. Can you provide
> > some specific examples?
> >
> > John
> >
> > --------------
> > John Graybeal <mailto:graybeal@xxxxxxxxx> -- 831-775-1956
> > Monterey Bay Aquarium Research Institute
> > Marine Metadata Interoperability Project: http://marinemetadata.org
> >
> >
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