Geonames.org
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My Name : Marc Wick
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Geonames.org : free global gazetteer
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Creative commons licence
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Daily dump (8.000-10.000 downloads/month)
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Webservices (up to over 3.000.000 requests/day)
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Semantic Web Ontology
8 March 2007, geonames.org
European GeoInformatics Workshop
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Data Sources
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Official sources wherever possible
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NGA,USGS,geobase.ca, linz, Brazil, ...
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Accuracy
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Geonames users
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Help find data
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Wiki-Style edit interface
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gtopo30,srtm3,timezone,polygon,postalcodes,tiger,...
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Wikipedia
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Geonames Feature Density
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Source Update - NGA
(National Geospatial Intelligence Agency)
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Every two or three months
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Compare updates to current geonames data
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Decide for every modification whether to apply
or not (mostly it is applied)
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Consistency checks (elevation, feature code)
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Who changed what?
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How reliable is source?
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NGA Update August 2006
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43244 Iran
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18272 Lebanon
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18247 Afghanistan
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10724 North Korea
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2476 Russia
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1431 South Korea
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783 Qatar
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729 Kuwait
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723 Pakistan
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Wikipedia Geodata
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Access to Geonames Data
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Html
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Csv : daily dump
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Xml (REST webservices)
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Json
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RDF
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RSS/GeoRSS
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KML (GoogleEarth)
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European GeoInformatics Workshop
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Geonames – Semantic Web
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Maintainer Bernard Vatant, Mondeca
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Ontology, codes
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Interlinking
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OWL Lite
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OWL Full (importing OWL Lite)
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Name
8 March 2007, geonames.org
rdfs:subPropertyOf
rdfs:label
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Categorization
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9 feature Classes
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650 feature codes
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SKOS (Simple Knowledge Organization System)
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gn:Class
subClassOf
skos:ConceptScheme
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gn:Code
subClassOf
skos:Concept
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Example :
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Class A = country, state, region
#A.ADM1 skos:inScheme rdf:resource="#A"
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RDF representation
<Feature rdf:about="http://sws.geonames.org/3020251/">
<name xml:lang="fr">Embrun</name>
<alternateName xml:lang="fr">Embrun, Hautes-Alpes</alternateName>
<featureClass rdf:resource="http://www.geonames.org/ontology#P"/>
<featureCode rdf:resource="http://www.geonames.org/ontology#P.PPL"/>
<inCountry rdf:resource="http://www.geonames.org/countries/#FR"/>
<population>7069</population>
<wgs84_pos:alt>900</wgs84_pos:alt>
<wgs84_pos:lat>44.5667</wgs84_pos:lat>
<wgs84_pos:long>6.5000</wgs84_pos:long>
<parentFeature rdf:resource="http://sws.geonames.org/3013738/"/>
<nearbyFeatures rdf:resource="http://sws.geonames.org/3020251/nearby.rdf"/>
<locationMap>http://www.geonames.org/3020251/embrun.html</locationMap>
<wikipediaArticle rdf:resource="http://fr.wikipedia.org/wiki/Embrun_%28Hautes-Alpes%29"/>
<wikipediaArticle rdf:resource="http://pl.wikipedia.org/wiki/Embrun"/>
<wikipediaArticle rdf:resource="http://de.wikipedia.org/wiki/Embrun"/>
<wikipediaArticle rdf:resource="http://en.wikipedia.org/wiki/Embrun%2C_Hautes-Alpes"/>
<wikipediaArticle rdf:resource="http://it.wikipedia.org/wiki/Embrun"/>
<wikipediaArticle rdf:resource="http://nl.wikipedia.org/wiki/Embrun"/>
<owl:sameAs rdf:resource="http://rdf.insee.fr/geo/COM_05046"/>
</Feature>
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European GeoInformatics Workshop
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Linked Data
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ChildrenFeatures
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ParentFeature
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NeighbouringFeatures
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NearbyFeatures (same FeatureClass)
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Alternate Names
<name>Edinburgh</name>
<alternateName xml:lang="ko"> 에든버러 </alternateName>
<alternateName xml:lang="ja"> エディンバラ </alternateName>
<alternateName xml:lang="th">เอดนบะระ</alternateName>
<alternateName xml:lang="cy">Caeredin</alternateName>
<alternateName xml:lang="br">Dinedin</alternateName>
<alternateName xml:lang="ga">Dún Éideann</alternateName>
<alternateName xml:lang="gd">Dùn Èideann</alternateName>
<alternateName xml:lang="oc">Edimborg</alternateName>
<alternateName xml:lang="fr">Édimbourg</alternateName>
<alternateName xml:lang="ca">Edimburg</alternateName>
<alternateName xml:lang="ast">Edimburgo</alternateName>
<alternateName xml:lang="es">Edimburgo</alternateName>
<alternateName xml:lang="gl">Edimburgo - Dùn Èideann</alternateName>
<alternateName xml:lang="de">Edinburgh</alternateName>
....
ca 60 names for Edinburgh in nearly as many languages. (up to 235)
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European GeoInformatics Workshop
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Concept vs Document
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Concept : http://sws.geonames.org/3020251/
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303 (See Other) redirection
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http://sws.geonames.org/3020251/about.rdf
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http://www.geonames.org/3020251/embrun.html
Accept-Header
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RewriteCond %{HTTP_ACCEPT} application/rdf
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RewriteRule ^/([0-9]*)/$ http://sws.geonames.org/$1/about.rdf [R=303,L]
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Apache
mod rewrite
ROME (RSS)
jdom.org (xml) JSON
Tomcat (Java)
JMS
JDBC
Full Text Index
TF-IDF
Gtopo30
Lucene
SRTM3
activeMQ
Database : Postgres
(postgis)
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Data exchange
www.PingTheSemanticWeb.org
download.geonames.org
dev.geonames.org
www.geonames.org
ws.geonames.org
sws.geonames.org
www.dbpedia.org
Semantic Web Crawlers
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Data exchange
www.PingTheSemanticWeb.org
download.geonames.org
www.geonames.org
dev.geonames.org
jms
Webservice call
Webservice call
jms
ws.geonames.org
sws.geonames.org
Rdf dump
www.dbpedia.org
Semantic Web Crawlers
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Are SW Crawlers obsolete?
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2 years to crawl 6.4 million records with 10sec
wait time
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How should SW search work?
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directories->crawlers->what is next?
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Structured data, synchronization
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Eg : ms hailstorm, google base, ping blogs,
sitemap ...
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What is next for geonames?
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Administrative divisions
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Integrate Wikipedia Landmarks in geonames
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Hotel data
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Continuously update and improve
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New gazetteer datasets
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Natural language geocoding
8 March 2007, geonames.org
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