ESDS Program

ESCO Unified Metadata Model Information


NASA’s Common Metadata Repository (CMR) is a high-performance, high-quality repository for Earth science metadata records that is designed to handle metadata at the Concept level. Collections and granules are common concepts in the Earth observation world, but this can be extended to visualizations, parameters, documentation, services, and more. CMR metadata records are supplied by a diverse array of data providers using a variety of supported metadata standards including ECHO 10, DIF 9, DIF 10, ISO 19115-1, and ISO 19115-2.

NASA's Unified Metadata Model (UMM) is an extensible metadata model that provides a cross-walk for mapping between CMR-supported metadata standards. Each CMR-supported metadata standard is mapped centrally to the UMM model, thus reducing the number of translations required. UMM describes metadata related to key Earth Observing System Data and Information System (EOSDIS) concepts such as collection or granule using UMM metadata “profiles." Each UMM profile is a document that provides a schema-agnostic representation of the elements necessary to provide high quality metadata for its related EOSDIS concept and that maps those elements to each CMR-supported metadata standard. To date, there are seven profiles described in the UMM:

  • Collections (UMM-C)
  • Granules (UMM-G)
  • Services (UMM-S)
  • Variables (UMM-Var)
  • Visualizations (UMM-Vis)—planned, publication date to be determined
  • Elements Common to multiple UMM component models (UMM-Common)


UMM profiles are implemented in CMR. More information on the status and schedule for UMM profile documents are contained in the UMM Schedules and Milestones table.
UMM documents will be periodically revised and updated.
Specification Profile Documents CMR Documents

User Resources

What Is CMR

More detailed information about UMM and CMR

Data Provider CMR Metadata Ingest

Earthdata Search Tool

Last Updated
Sep 17, 2019