This presentation covers key issues related to Geospatial Semantic Web: (1) extracting hidden knowledge from unstructured and structured data, (2) knowledge fusion over heterogeneous data sources, (3) ontology sharing and (4) building user-friendly Semantic Web applications.

It also describes state-of-the-art technologies that attempt to solve these problems. This discussion covers upper-case Semantic Web vs. lower-case semantic web, GeoRSS, W3C Geo ontology, GML, Flickr machine tags, geonames and Google Maps mashups.