Page History

Introduction

This wiki resource provides best practices documentation for all collection and granule metadata concepts supported by the Common Metadata Repository (CMR). It is intended to support metadata authors as well as provide general guidance to those seeking information about CMR supported metadata concepts. 

The wiki is organized by metadata concept as specified in the Unified Metadata Model (UMM) and includes information such as: required metadata fields, definitions for each metadata concept, best practices for populating each metadata field, guidance on how to use controlled vocabularies, and the revision history of the UMM metadata schema. Also included are a detailed mapping/crosswalk between each UMM metadata field and the corresponding field in each CMR supported metadata standard. Supported standards currently include ECHO 10, DIF 10, ISO 19115-2 (in NASA specific MENDS and SMAP "flavors"), and ISO 19115-1.   

Unified Metadata Model (UMM): UMM-C

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, UMM-G

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and UMM-Common

The Unified Metadata Model (UMM) is used as a bridge to map between each of the CMR-supported metadata standards. A number of different objects require descriptive metadata that is modeled using a corresponding UMM profile. For example, a collection (i.e. or dataset level) object is modeled using the UMM-C (Collection) profile, and granule (i.e. or file level) objects are modeled using the UMM-C and the UMM-G profiles, respectively(Granule) profile.

While UMM-C and UMM-G are separate entities, some elements are common to each profile and are therefore modeled using UMM-Common.

Currently, this wiki resource provides documentation for elements found in the UMM-C, UMM-G and UMM-Common models. 

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For information regarding UMM-Var please download the UMM-Var document from the CMR Documents page.  

Wiki Page Structure

Each wiki page has the following outline:<>

UMM-Common: Elements Common between Collections and Granules

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