- From: <Simon.Cox@csiro.au>
- Date: Tue, 7 Jan 2014 00:44:48 +0000
- To: <auguste.atemezing@eurecom.fr>, <frans.knibbe@geodan.nl>
- CC: <public-locadd@w3.org>
Still catching up on the various threads here: > we are finishing two vocabularies that basically reuse NeoGeo, GeoSPARQL to re-define the existing semantics of POINT by taking into account what you just pointed out.. > > 1- A vocab for CRS: http://goo.gl/UchRcy, that will be tied to the publication of at least the list of CRS maintained at IGN. The current authority for CRS definitions would be ISO 19111:2007 'Spatial Referencing by Coordinates' which provides a UML model for the description of CRS, essentially as used in the EPSG registry. It looks like much of your vocabulary uses similar terminology, though I don't see any specific provenance statement. The ISO ontologies you (Ghislain) found on the CSIRO site includes a skeleton with just the class hierarchy - http://def.seegrid.csiro.au/isotc211/iso19111/2007/crs [1] but almost none of the properties, yet. ISO/TC 211 will complete these in due course. Please note that the ISO ontologies are/will be very literal translations of the UML models, so may miss a few tricks that would be used starting with OWL, but do nevertheless embody a great deal of analysis and 'tradition'. Some harmonization would probably be desirable. Simon [1] Parrot documentation here: http://ontorule-project.eu/parrot/parrot?documentUri=http%3A%2F%2Fdef.seegrid.csiro.au%2Fisotc211%2Fiso19111%2F2007%2Fcrs&mimetype=default&documentUri=http%3A%2F%2Fdef.seegrid.csiro.au%2Fisotc211%2Fiso19111%2F2007%2Frs&mimetype=default&documentUri=http%3A%2F%2Fdef.seegrid.csiro.au%2Fisotc211%2Fiso19111%2F2007%2Fcs&mimetype=default&documentUri=http%3A%2F%2Fdef.seegrid.csiro.au%2Fisotc211%2Fiso19111%2F2007%2Fdatum&mimetype=default&profile=technical&language=en&customizeCssUrl= -----Original Message----- From: Ghislain Atemezing [mailto:auguste.atemezing@eurecom.fr] Sent: Saturday, 21 December 2013 1:07 AM To: Frans Knibbe | Geodan Cc: public-locadd@w3.org; atemezin Subject: Re: ISA Core Location Vocabulary Hi Frans, > A completely different thing: I see that the Location Core Vocabulary > does not define a new way of encoding geometry, but rather permits the > encoding specified in GeoSPARQL and Basic Geo. Was NeoGeo ever > considered too? One consideration may be that the world at large will > not be helped by having many different encodings for geometry. I think > I would prefer just an encoding of WKT, but without including the (URI > of) the coordinate reference system (CRS). I believe the SRS should be > a separate entity, to be applicable to a geometry, to a collection of > geometries, or to a dataset. +1. This is definitively a way to go and with the colleagues at IGN-France, we are finishing two vocabularies that basically reuse NeoGeo, GeoSPARQL to re-define the existing semantics of POINT by taking into account what you just pointed out.. 1- A vocab for CRS: http://goo.gl/UchRcy, that will be tied to the publication of at least the list of CRS maintained at IGN. 2- A yet another vocab for geometry, where we allow to have different CRS for a geometry. See http://goo.gl/nsJfei. You can play with this application, "Perfect School"[1] where from the initial dataset in LAMBERT93, we provide for each resource two different encoded values for the geometries. For example, we have queries like this [ ?s rdf:type aiiso:School ; geom:geometry ?loc ; ecole:nature ?nature . ?loc geom:coordX ?lat ; geom:coordY ?lng ; geom:systCoord ignfr:wgs84g . # here we specify the CRS, e.g: ignfr:ntflamb2e ] where we will publish all the CRS in this domain space ignfr: <http://data.ign.fr/id/ignf/systemecoordonnees/> More to come when all the current issues are solved and the vocabs are in a stable version... Happy Holidays to everyone. [1] http://semantics.eurecom.fr/datalift/PerfectSchool/ -- Ghislain Atemezing EURECOM, Multimedia Communications Department Campus SophiaTech 450, route des Chappes, 06410 Biot, France. e-mail: auguste.atemezing@eurecom.fr & ghislain.atemezing@gmail.com Tel: +33 (0)4 - 9300 8178 Fax: +33 (0)4 - 9000 8200 Web: http://www.eurecom.fr/~atemezin Google+:http://google.com/+GhislainATEMEZING Twitter:@gatemezing
Received on Tuesday, 7 January 2014 00:45:34 UTC