Re: Sub-properties for locn:geometry? (was: RE: ISA Core Location Vocabulary)

On 2014-01-10 12:50, Andrea Perego wrote:
>
> ---------- Original message  ----------
>
> Da: "John Goodwin" <John.Goodwin@ordnancesurvey.co.uk 
> <mailto:John.Goodwin@ordnancesurvey.co.uk>>
> Data: 10/gen/2014 11:55
> Oggetto: RE: ISA Core Location Vocabulary
> A: "public-locadd@w3.org <mailto:public-locadd@w3.org>" 
> <public-locadd@w3.org <mailto:public-locadd@w3.org>>
>
> Hi all,
>
> I am still working my way through all the recent activity on this 
> group so apologies if this issue has already been discussed. One 
> requirement Ordnance Survey has in its administrative geography linked 
> data (http://data.ordnancesurvey.co.uk/datasets/boundary-line) is to 
> specify different geometries. In this case we have two: a 
> 'representative point' and an 'extent'. So I was wondering if we 
> should create a few subproperties of locn:geometry for a few common 
> geometry types, e.g. "hasCentroid" [1], "boundary", "extent", 
> "representativePoint", "mbr" etc.
>
> Thoughts?
>

------------- This was previously posted in a different thread and has 
already been responded to in this thread -----------------

An interesting idea. Aren't all these geometries derived geometries? 
Somehow a result of a calculation performed on the original geometry? I 
would expect at least a need for (SPARQL) functions that can return 
those derived geometries. But that puts extra demands on SPARQL 
endpoints, so why not simple make those data directly available? I am 
sure it will be helpful in some cases.

By the way, what is the difference between 'extent' and 'mbr'?

As all the subproperties are geometries themselves, why not define them 
as subclasses?

Regards,
Frans


> John
>
> [1] for some value of "hasCentroid"
>
> Dr John Goodwin
> Principal Scientist
> Research, Ordnance Survey
> Adanac Drive, SOUTHAMPTON, United Kingdom, SO16 0AS
> Phone: +44 (0) 23 8005 5761
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