Semantic enrichment of places with vgi sources a knowledge based approach

Centre Universitaire d’Informatique Institute of Information Service Science

Seman&cenrichmentofplaceswithVGIsources:aknowledge

basedapproachTardy,C.,Falquet,G.,Moccozet,M.WorkshopGIR’16–SIGSpa2al2016

November2016-SanFrancisco,California,USA

ProblemStatementHowtousesocialmediatagstoiden2fyplacesandtheir

characteris2cs?

•  Usingpicturetags

•  Categoriza?onalgorithm•  basedongeographicandterminologicalknowledgeresources

•  notasta?s?calapproach

•  Forplaceswithsmallnumberofdata

Tardyetal.,UniversityofGeneva 2

Example

Characteris&cs•  Music/Musique•  Concert/Gigs•  Shows

Tardyetal.,UniversityofGeneva 3hJps://flic.kr/p/m9ZBPB

Places•  Geneva/Genève•  Switzerland•  Plainpalais•  Carouge•  Alpes/Alps•  ChatNoir•  ThéatrePitoëff•  Canada

Method

Tagti

Geoweightgw(ti)

Sense&Category{ti,sensei,cati}


geoprocess

wordsenseprocess

Disambigua?on1.  Findngw(ti)2.  Compareweights

DispatchtagGeoORnonGeo

Geocoverage

Characteris?cs

Discard

GeoProcess


Localisa?onExampleFlickrphotoloca?oninfo:

<loca&onla&tude="46.193959"longitude="6.143385”accuracy="16"context="0"place_id="EDcBbVFWWrj07WE”woeid="782861”>


WordSenseProcess


Disambigua?on


TagsExtrac?on


Example

ActorEvent Temporal

Color Uniden&fied

“Seman&cEnhancementofPlaces”(SEP)tags:•  Ambiance•  Nightlife•  Music/Musique•  Concert/Gigs•  Shows•  Fes?val•  ASMV


Ingeocoverage:

àThéâtrePitoëff

Geographicfeature/Geographicfeatureclass

hJps://flic.kr/p/m9ZBPB

Tes?ng


hJps://flic.kr/p/qnvRLa

Results

•  142photos

•  3validators•  2datasetsinGenevaarea,Switzerland

•  Mul?-labelprecision-recall:o precision=72.5%;o recall=66.7%;o F-measure=0.695


Conclusion

•  Atechniquethatcombinesgeographicalknowledgeandtheextrac?onoftextseman?cs

•  Evalua?onsshowthatthetechniqueiseffec?ve–  Canbeusedtoenhancespa?aldescrip?onsingeo-services(Citygml,

OpenStreetMap)

–  Worksongeographiczoneswithlowdensityofresources

Futureexplora?ons•  Useitasapre-treatmenttosta?s?calapproach

•  Refinetheanalysisforphotosdescribingmul?plegeofeatures


Semantic enrichment of places with vgi sources a knowledge based approach

Science

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