W3C home > Mailing lists > Public > public-locadd@w3.org > January 2014

RE: Sub-properties for locn:geometry?

From: John Goodwin <John.Goodwin@ordnancesurvey.co.uk>
Date: Mon, 27 Jan 2014 09:12:01 +0000
To: RaphaŽl Troncy <raphael.troncy@eurecom.fr>, "Andrea Perego" <andrea.perego@jrc.ec.europa.eu>, Frans Knibbe | Geodan <frans.knibbe@geodan.nl>
CC: Sven Schade <sven.schade@jrc.ec.europa.eu>, "LocAdd W3C CG Public Mailing list" <public-locadd@w3.org>
Message-ID: <30BB6C643AA06A429A22F4F40CCD13D420579F50@WP112.ordsvy.gov.uk>
Hi,

> * Your 'locn:representativePoint' predicate would be the equivalent of 
> the 'ex:aCentroid' of Frans?

Similar - centroid has a more specific meaning, and there are a number of 'centroids' (e.g. centre of gravity). By 'representative point' I simple mean a point guaranteed to lie within the region in question. 

> * I'm not sure I understand the difference between your proposed 
> 'locn:extent' predicate and the existing 'locn:geometry' predicate, 
> except the later is loosely defined. Is the same thing?

A could of things. Simon C points out that extent (in some ISO standard) is actually an MBR so I might need to pick a new predicate here. The different for me was the locn:extent was a specific kind of geometry representing the footprint of the geographic thing in question. Often a polygon, potentially a multipolygon/multisurface [1]. We could also potential link the geographic thing to a 'boundary' where the boundary is a line string. This would be another type of geometry.

> * What about the MBR? Is just another 'extent' (polygon) or should it 
> have a specific type because we want to say something about it?

Will have to check my standards...

John

[1] - possibly being too loose with my terminology at the moment, but it is Monday morning  :)
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Received on Monday, 27 January 2014 09:12:29 UTC

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