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title	Common Metadata Repository (CMR)	borderStyle	solidOverview

The Common Metadata Repository (CMR) catalogues catalogs all data and service metadata records for the EOSDIS system will be the authoritative management system for all EOSDIS metadata. These metadata records are registered, modified, discovered, and accessed through programmatic interfaces leveraging standard protocols and APIs.

CMR is designed:

to serve as a middleware replacement

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

Note: Users of GCMD should see no impact - asThe GCMD frontend will remain as is.
CMR is designed to handle metadata at the Concept level beyond just ; including 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 manage hundreds of millions of metadata records; making them available through high performance, standards compliant, temporal, spatial, and faceted search.
CMR incorporates to incorporate both human and machine metadata assessment features that work to ensure the highest quality metadata possible
around an evolvable Unified Metadata Model (UMM).

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title	Unified Metadata Model (UMM)
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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.

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