The Common Metadata Repository (CMR) catalogues all data and service metadata records for the EOSDIS system. These metadata records are registered, modified, discovered, and accessed through programmatic interfaces leveraging standard protocols and APIs.
CMR will be the authoritative management system for all EOSDIS metadata for all EOSDIS data holdings.
CMR is a common middleware replacement for for the ECHO backend and GCMD’s backend. The GCMD frontend, however, will not change and users of GCMD should see no impact.
CMR is designed to handle metadata at the Concept level beyond just Collections and Granules to Visualizations, Parameters, Documentation, Services, and more.
CMR is designed around an evolvable Unified Metadata Model (UMM).
CMR is designed to handle hundreds of millions of metadata records; making them available through high performance, standards compliant, temporal, spatial, and faceted search.
CMR incorporates both human and machine metadata assessment features that work to ensure the highest quality metadata possible
Unified Metadata Model (UMM)
The Unified Metadata Model is a model that encompasses various metadata profiles maintained and archived by EOSDIS. The UMM will be used by the Common Metadata Repository and will drive search and retrieval of metadata cataloged within that system.
The UMM is managed as a series of documents, each covering a subset of the entire UMM. An overview of the UMM and the UMM documents are provided on the UMM Documents page.
