GeoKnow (http://geoknow.eu) is an EU funded, three-year project about research on the spatial Semantic Web. We will investigate interlinking, information management, quality assessment, aggregation, browsing, visualisation and authoring of spatial web data. Our research will be applied in supply chain management and travel industry use cases. IMIS participates in the project with the aim to develop query optimization and fusion/aggregation techniques for semantic geospatial data. We will be applying open geospatial data from OpenStreetMap and DBPedia, combining them with other linked data sources. Our research results will be integrated in Virtuoso and will offer web services for querying and managing linked data according to the GeoSPARQL specification.