This poster presents the self-developed, multi-level TR32DB Metadata Schema. It was designed and implemented with the purpose to describe all heterogeneous data, which are created by project participants of an interdisciplinary research project, with accurate, interoperable metadata. The metadata schema considers the interoperability to recent metadata standards and schemas. It is applied in the CRC/TR32 project database (TR32DB, www.tr32db.de), a research data management system, to improve the documentation, searchability and re-use of the data. The TR32DB is established for a multidisciplinary, long-term research project, the Collaborative Research Centre/Transregio 32 ‘Patterns in Soil-Vegetation-Atmosphere Systems: Monitoring, Modelling, and Data Assimilation’ (CRC/TR32, www.tr32.de), funded by the German Research Foundation.