Diploma Thesis, School of Electrical and Computer Engineering, National Technical University of Athens, Greece
Abstract. The objective of this thesis was firstly the transformation of geospatial data to RDF and secondly the development of techniques for the interlinking of semantic geospatial data. In the context of the first goal we developed Geosm, a tool for the transformation of mapping data from OpenStreetMap to RDF graphs in compliance with the OGC GeoSPARQL standard. For the development of the tool we made use of the existing tool Osmosis and of the library Apache Jena, while to ensure compatibility with LinkedGeoData project we made use of the same RDF vocabularies. In the context of the second goal we explored the issue of interlinκing semantic geospatial data by examining the capabilities of existing string similarity metrics, by designing new metrics for the similarity of geometries in concert with the requirements imposed by our data and lastly by executing a wide range of experiments on data we collected for this purpose in order to analyse the quality of the metrics and draw conclusions concerning their best use.