UNIGIS Abschlussarbeiten

Der krönende Abschluss eines UNIGIS MSc Studiums ist sicherlich die Master Thesis. Mit ihr belegen unsere MSc-AbsolventInnen, dass sie den akademischen Grad "Master of Science (Geographical Information Science & Systems)" zu Recht führen.  Im UNIGIS professional Studiengang muss keine Abschlussarbeit verfasst werden. Dennoch nehmen einige Studierende die Möglichkeit war, ein Geoinformatikprojekt durchzuführen und entsprechend zu dokumentieren.

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Sven Hendrik Tschirner [02-2012]:

Semantischer Zugriff auf INSPIRE. Verteilte Suche und Publikation von GML-Daten im Semantic Web am Beispiel INSPIRE

Diese Arbeit ist online verfügbar: Download

In the near future the INSPIRE-directive will make accessible pan-European harmonised geodatasets mostly free of charge. The interoperable data exchange will be established by standardised Geo Web-service interfaces and transfer formats while visualizing and querying geodatasets within compatible geoportals. The restriction to the Geo Web technical domain and the thereby predetermined analysis methods and use cases might imply obstacles for the usage of INSPIRE raw data. Because they generally hamper a semantic analysis, the simultaneous evaluation of multiple INSPIRE data pools or the integration with the already existing freely accessible Internet-databases of governmental or user-generated contents. The Semantic Web and its Linked Open Data initiative for linking noncommercial data o ers an alternative technical platform which is predestined for such integration tasks due to its semantic evaluation means and therefore could make a promising contribution to a broader usage of INSPIRE data. Serving as a feasibility study this thesis presents a comprehensive approach for accessing and doing distributed queries to INSPIRE data by means of the Semantic Web. For this purpose an examination is done to point out similiarities of both the Semantic Web and the Geo Web and to have a look at the particular standardisations and well-established methods of each discipline. Special attention is given to the eld of geodata processing, which the OGC considers to be the linking key of both disciplines and therefore brought forward a new standardisation approach called GeoSPARQL. The GeoSPARQL draft which has the goal to introduce professional GIS analysis methods into the Semantic Web is explicitly discussed within this thesis and the results are submitted as comments during the ocial GeoSPARQL review. The thesis' technical approach consists of two concepts. First, a modelling concept with conversion rules de ning the conversion of INSPIRE UML data models into Semantic Web OWL ontologies, taking into account Linked Open Data principles. Second, a proposal for a system architecture based on a proxy application, which uses the schema knowledge of the OWL ontologies in order to convert Semantic Web queries of the common language SPARQL into WFS GetFeature requests and forward them to remote INSPIRE Download Services. Finally the resulting INSPIRE GML datasets are transformed into SemanticWeb formats conform to the OWL ontologies. Both concepts, the language conversion as well as the result transformation are realised in a prototype implementation and their feasibility has been proved in several test scenarios. Hence, the proposed solution o ers a transparent and selective Semantic Web access to INSPIRE data providing the opportunity to apply distributed queries and semantic analysis for an overall increase in value.

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