Re: person location WRT position

Guido
thanks a lot for your suggestion below
I have been thinking about how to express the possible dilemma of space and
time
Cause objects change state, and can be sometimes static and sometimes
dynamic, in different measure

And static is always a relative value, anyway
So I am comfortable with the representation

Also what you say below, somehow links in with the notion of timestamp
as you say 'at a certain time'
So, I would be tempted to capture the time whenever such state changes,

pdm

On Wed, Sep 17, 2008 at 8:56 AM, Guido Vetere <gvetere@it.ibm.com> wrote:

>
> Hi all,
> I'm new here. I'm getting involved in your activity because I'm managing a
> R&D European Project on Crisis Management (www.workpad-project.eu) where IBM
> Italia participates.
>
> Also, here at my center we do some work with formal ontologies and
> cooperate with people at Laboratory of Applied Ontology at CNR Italy (
> www.loa-cnr.it)
>
> As for this discussion, I'd suggest looking at how the problem has been
> addressed in well-known upper ontologies such as SUMO or DOLCE - the latter
> is my favourite one, have a look at http://www.loa-cnr.it/DOLCE.html
>
> In brief, according with these models, there is a distinction between Space
> Region which is abstract - like numbers - and denotes a region on the Earth
> (or possibly elsewhere) and, for concrete objects, the notion of Spatial
> Location which is the Quality of being placed in a Space Region at a certain
> time. Space regions are the same, whether are taken by stable objects or
> mobile things, while locations of objects change, often, seldom, maybe
> never. To allign with known upper ontologies, 'Position' could be a Spatial
> Location (i.e. a (reified) Quality, or a property if you whish), while
> 'Location' could be a class representing a Space Region in any suitable
> standard way.
>
> Hope that help.
>
> Cordiali Saluti, Best Regards,
>
> Guido Vetere
> Manager & Research Coordinator, IBM Center for Advanced Studies Rome
> -----------------------
> IBM Italia S.p.A.
> via Sciangai 53, 00144 Rome,
> Italy
> -----------------------
> mail:     gvetere@it.ibm.com
> phone: +39 06 59662137
> mobile: +39 335 7454658
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>
>
>
>  *Gavin Treadgold <gt@kestrel.co.nz>*
> Sent by: public-xg-eiif-request@w3.org
>
> 17/09/2008 05.27
>   To
> public-xg-eiif <public-xg-eiif@w3..org>
>  cc
>   Subject
> Re: person location WRT position
>
>
>
>
>
> On 2008-09-17, at 1502, Nuwan Waidyanatha wrote:
>
> > IMO, location is relatively static because earth does rotate; relative
> > to the sun; therefore, the address, if labeled as a location, is in
> > motion.
>
> No it isn't, as most of the co-ordinate systems used for location are
> fixed to the earth's frame of reference - this includes the underlying
> model (e.g. a global geoid that approximates the chape of the earth,
> or a regional grid that approximates a country or jurisdiction. These
> are usually either global co-ordinate systems or local - e.g.
> jurisdictions, regions or countries. The application of them depends
> on the accuracy required and the application of the data e.g.
> cadestral databases generally require a high degree of precision and
> are more prone to say shifting of tectonic plates over time.
>
> In summary, most of the systems we use, such as WGS84 & Lat/Long move
> with the Earth's rotation so it is not an issue.
>
> Cheers Gav
>
>
>
>
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-- 
Paola Di Maio
School of IT
www.mfu.ac.th
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