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title	What is the Common Metadata Repository (CMR)?

The Common Metadata Repository (CMR) catalogs all data and service metadata records for the EOSDIS system and 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.

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title	What are the objectives of CMR?

CMR is designed:

to serve as a middleware replacement for the ECHO and GCMD’s backend. Note: Users of GCMD should see no impact - as the GCMD frontend will remain as is.
to handle metadata at the Concept level; including Collections, Granules, Visualizations, Parameters, Documentation, Services, and more.
to manage hundreds of millions of metadata records; making them available through high performance, standards compliant, temporal, spatial, and faceted search.
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	What is the Unified Metadata Model (UMM)?

The Unified Metadata Model encompasses various metadata profiles maintained and archived by EOSDIS and will be used by the Common Metadata Repository to drive search and retrieval of metadata cataloged within that system.

The UMM is managed as a series of documents, each representing a UMM subset. Information and documents pertaining to the UMM are provided on the UMM Information page.

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