Thanks.
Your answers and links helped a lot.
But, It would be nice to review how DBpedia obtains the geo:lat,geo:lon and
geo:geometry because there are resources
with incoherent data (geo:lat has an apparently incorrect value while the
dbpedia extractions from Wikipedia are correct).
If those values come from the Wikipedia dumps seems like the geo-extractor
is failing in some cases, obtaining
incorrect geo:lat geo:lon values.
Salut!
On Wed, May 30, 2012 at 1:17 PM, <
[email protected]> wrote:
> Date: Wed, 30 May 2012 11:06:57 +0200
> From: Ghislain Atemezing <[email protected]>
> Subject: Re: [Dbpedia-discussion] Geographic Coordinates of Places
> To: [email protected]
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Hi Jordi,
> >
> > I have a couple of questions and probably you have the correct answer
> > that I can't find.
> >
> > 1)
> > I'm retrieving city points using the SPARQL endpoint and I find that
> > there are various predicates for the geographic coordinates: geo:lat ,
> > geo:long, geo:POINT, grs:point and geo:geometry
>
>
> > For my convenience I used geo:geometry WKT format, but I realized that
> > not all the resources have this predicate (http://dbpedia.org/page/Oslo
> > does not have it while http://dbpedia.org/page/Barcelona) has it.
> >
> > It poses me the question, Which of those predicates is present in all
> > the resources?
>
> I guess the most uses are geo:lat, geo:long and geo:POINT. At least the
> first two predicates, because they come from the W3C Geo onto [1] and is
> one of the most used in GeoData [2]. WKT is a serialization as well as
> KML, GeoJSON , etc..
> > 2)
> > This question comes from a problem that I have with some points in
> > DBpedia. For example Allueva (Spain).
> >
> > Are the coordinates extracted from Wikipedia geodata or from another
> > service? Because I see that the properties are properly parsed
> > dbpedia:latd, dbpedia:latm, dbpedia:latns etc but the geo:geometry has a
> > different value.
> Here, I could only point you to other initiatives/ services dealing with
> GeoData: linkedGeoData [3], GADM [4] and NUTS [5] with mappings to DBpedia
>
> I hope it helps..
>
> Best,
>
> Ghislain
> [1] http://www.w3.org/2003/01/geo/wgs84_pos#
> [2] http://stats.lod2.eu/vocabularies
> [3] http://linkedgeodata.org/Datasets
> [4] http://gadm.geovocab.org/
> [5] http://nuts.geovocab.org/
>
> --
> Ghislain Atemezing
> EURECOM, Multimedia Communications Department
> 2229, route des Cr?tes, 06560 Sophia Antipolis, France.
> e-mail: [email protected] & [email protected]
> Tel: +33 (0)4 - 9300 8178
> Fax: +33 (0)4 - 9000 8200
> Web: http://www.eurecom.fr/~atemezin
>
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