More details: First a link to a presentation: AGU Fall 2014 - Streamlining Metadata in NASA EOSDIS CMR To increase the level of quality and consistency among its metadata holdings, EOSDIS has developed (and continues to develop and expand) a model for various metadata profiles that it archives and maintains. This model aims to document vital elements that may be represented across various metadata formats and standards and unify them through core fields useful for data discovery and service invocations. This unified model, aptly named the Unified Metadata Model (UMM), has been developed as part of the EOSDIS Metadata Architecture Studies (MAS I and II) conducted between 2012 and 2013. The UMM will be used by the Common Metadata Repository (CMR) and will drive search and retrieval of metadata cataloged within that system. All UMM profiles will be mapped to the ISO 19115 metadata model as shown in the diagram below. Image Modified
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