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During the last decade, operational monitoring and forecasting systems havebeen developed in all the European seas. The exchange of data and productsand the development of services for a wide community of users pose somefundamental issues, whose solution has become a priority in integrated andGMES referring projects, such as the MERSEA European project. These projectsaim to develop a European system for operational monitoring and forecastingon global and regional scales of ocean physics, bio-chemistry and ecosystems.GMES system and its operational projects need to federate resources andexpertise coming from diverse organizations working on different EarthSciences fields (e.g. satellite data processing, in situ observing systems,data management, ocean and ecosystem modeling, etc.). Therefore, it isrequired a Marine Information Management (MIM) system capable of facilitatingthe regular real-time exchange of high quality information, data andproducts. Moreover, MIM system must provide appropriate information for awide range of external users both in real-time and delayed mode.</p><p style="line-height: 20px;">In this paper an architecture based on the OPeNDAP/THREDDS technology isproposed as a solution for these operational systems. In this context, acatalog merging solution is introduced for the MIM system, which results inthe design and development of the THREDDS Dataset Merger (TDM): a set ofservices meant to merge THREDDS Dataset Inventory Catalogs, so to achieve aunique catalog service for a whole database federation. TDM service mergesdistributed and autonomous THREDDS catalogs in order to work out a virtualmerged catalog. The TDM service was extended in order to provide automaticcatalogs synchronization. This service allows extending the pull-based TDMparadigm to support push-based applications. Some security issues are alsoconsidered

Federated data bases for the development of an operational monitoring and forecasting system of the ocean: the THREDDS Dataset Merger