Re: ISA Core Location Vocabulary

On 2014-01-10 11:55, John Goodwin wrote:
> 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?
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
> www.ordnancesurvey.co.uk | john.goodwin@ordnancesurvey.co.uk
> Please consider your environmental responsibility before printing this email.
>
> This email is only intended for the person to whom it is addressed and may contain confidential information. If you have received this email in error, please notify the sender and delete this email which must not be copied, distributed or disclosed to any other person.
>
> Unless stated otherwise, the contents of this email are personal to the writer and do not represent the official view of Ordnance Survey. Nor can any contract be formed on Ordnance Survey's behalf via email. We reserve the right to monitor emails and attachments without prior notice.
>
> Thank you for your cooperation.
>
> Ordnance Survey
> Adanac Drive
> Southampton SO16 0AS
> Tel: 08456 050505
> http://www.ordnancesurvey.co.uk
>
>
>


-- 
--------------------------------------
*Geodan*
President Kennedylaan 1
1079 MB Amsterdam (NL)

T +31 (0)20 - 5711 347
E frans.knibbe@geodan.nl
www.geodan.nl <http://www.geodan.nl> | disclaimer 
<http://www.geodan.nl/disclaimer>
--------------------------------------