Spatial Data in the Semantic Web

In order to employ the Web as a medium for data and information integration, comprehensive datasets and vocabularies are required as they enable the disambiguation and alignment of other data and information. Many real-life information integration and aggregation tasks are impossible without comprehensive background knowledge related to spatial features of the ways, structures and landscapes surrounding us. One of the central projects in this area is LinkedGeoData, in which data from OpenStreetMap is converted to RDF and linked to other knowledge bases. We designed a virtual mapping approach that allows to rewrite an incoming SPARQL query into a single SQL query potentially containing virtual spatial predicates. At that time, this was novel and allowed us to scale to a dataset with more than 30 billion facts, more than 1000 updates per minute and a semi-automatically generated ontology. Later on, in the GeoKnow EU project, we – together with other partners – build a landscape of tools to facilitate the entire life cycle of  spatial data including the stages shown below.

Figure: The Linked Data Life Cycle implemented in the GeoKnow EU project (2012-2015)

Related Publications

Journal Articles

Athanasiou, Spiros; Hladky, Daniel; Giannopoulos, Giorgos; García-Rojas, Alejandra; Lehmann, Jens

GeoKnow: Making the Web an Exploratory Place for Geospatial Knowledge Journal Article

In: ERCIM News, 2014 (96), 2014.

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Stadler, Claus; Lehmann, Jens; Höffner, Konrad; Auer, Sören

LinkedGeoData: A core for a web of spatial open data Journal Article

In: Semantic Web, 3 (4), pp. 333–354, 2012.

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Lehmann, Jens; Athanasiou, Spiros; Both, Andreas; García-Rojas, Alejandra; Giannopoulos, Giorgos; Hladky, Daniel; Grange, Jon Jay Le; Ngomo, Axel-Cyrille Ngonga; Sherif, Mohamed Ahmed; Stadler, Claus; Wauer, Matthias; Westphal, Patrick; Zaslawski, Vadim

Managing Geospatial Linked Data in the GeoKnow Project Incollection

In: The Semantic Web in Earth and Space Science. Current Status and Future Directions, 20 , pp. 51–78, IOS Press, 2015.

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Tahmasebzadeh, Golsa; Kacupaj, Endri; Müller-Budack, Eric; Hakimov, Sherzod; Lehmann, Jens; Ewerth, Ralph

GeoWINE: Geolocation based Wiki, Image, News and Event Retrieval Inproceedings

In: SIGIR '21: The 44th International ACM SIGIR Conference on Research and Development in Information Retrieval, Virtual Event, Canada, July 11-15, 2021, pp. 2565–2569, ACM, 2021.

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Athanasiou, Spiros; Giannopoulos, Giorgos; Graux, Damien; Karagiannakis, Nikos; Lehmann, Jens; Ngomo, Axel-Cyrille Ngonga; Patroumpas, Kostas; Sherif, Mohamed Ahmed; Skoutas, Dimitrios

Big POI data integration with Linked Data technologies Inproceedings

In: Advances in Database Technology - 22nd International Conference on Extending Database Technology, EDBT 2019, Lisbon, Portugal, March 26-29, 2019, pp. 477–488,, 2019.

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Dadwal, Rajjat; Graux, Damien; Sejdiu, Gezim; Jabeen, Hajira; Lehmann, Jens

Clustering Pipelines of Large RDF POI Data Inproceedings

In: The Semantic Web: ESWC 2019 Satellite Events - ESWC 2019 Satellite Events, Portorož, Slovenia, June 2-6, 2019, Revised Selected Papers, pp. 24–27, Springer, 2019.

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Auer, Sören; Lehmann, Jens; Hellmann, Sebastian

LinkedGeoData: Adding a Spatial Dimension to the Web of Data Inproceedings

In: The Semantic Web - ISWC 2009, 8th International Semantic Web Conference, ISWC 2009, Chantilly, VA, USA, October 25-29, 2009. Proceedings, pp. 731–746, Springer, 2009.

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