It is a collaborative project between The Heinz-Nixdorf Endowed Chair for Distributed Information Systems at the Friedrich-Schiller-University (FSU) Jena and German Aerospace Center (DLR). The project focuses on interoperability of the citizen science data. Semantic web technologies can be used to realize a model for citizen science measurement and observation data by covering not only the content related aspects, but also including information on the quality, trustworthiness and provenance of the data.