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The objective of the Poseidon Coastal Zone Management System project is to develop a distributed data and software architecture to locate, retrieve, utilize (in simulations and analysis), and visualize information about the coastal ocean environment. The work described in this paper concentrates on the issues related to efficiently identifying and creating the data needed for a given task. Since scientific data sets often do not contain information about the environment in which the data was obtained, we need a method of distinguishing data based on external information, or metadata. This metadata needs to be standardized in order to facilitate searching. While many metadata standards exist, no one of them is adequate for representing all the information needed for coastal zone management. We have therefore implemented a method that incorporates three existing metadata standards in an expandable object-oriented structure known as the Warwick Framework. Furthermore, since metadata is expensive and tedious to produce, we have developed a web-based software tool that simplifies the process and reduces the storage of redundant information.While we can search the metadata for the information we need, we still need a common vocabulary, or ontology, to ensure that we can identify data unambiguously. Since no existing vocabulary encapsulates all aspects of the ocean sciences and ocean systems management, we have facilitated the production of such a resource by creating a web-based tool that will allow specialists with the requisite domain knowledge (e.g., oceanographers, acousticians, coastal zone managers, etc.) to populate the ontology independently. The tool handles all the logistical issues of storage, maintenance, and distribution.