DRAFT
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.
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. Click here to jump directly to the documentation.
Unified Metadata Model (UMM)
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 (or dataset level) object is modeled using the UMM-C (Collection) profile, and granule (or file level) objects are modeled using the UMM-G (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.
Other UMM models not covered here include UMM-S (Services) and UMM-Var (Variables).
For information regarding UMM-S please refer to the CMR Documents page and the UMM-S Curator's Guide.
For information regarding UMM-Var please download the UMM-Var document from the CMR Documents page.
Wiki Page Structure
Each wiki page is structured as follows:
Documentation Directory
There is a separate wiki page for each high level metadata concept in the UMM. The tables below link directly to the documentation for each concept:
Data Identification Concepts:
Element | UMM Model | Definition | Required |
---|---|---|---|
Entry Title | This element describes the title of the dataset described by the metadata. | Yes | |
Short Name | Yes | ||
Version | Yes | ||
Version Description | No | ||
DOI | Yes | ||
Abstract | Yes | ||
Purpose | No | ||
Data Language | No | ||
Data Dates | No | ||
Processing Level | Yes | ||
Collection Data Type | No | ||
Collection Progress | Yes | ||
Maturity | No | ||
Collection Citation | |||
Archive and Distribution Information | |||
Access Constraints | |||
Use Constraints | |||
Quality | |||
Contact Group | |||
Contact Person | |||
Publication Reference | |||
Metadata Association |
Temporal Information Concepts:
Element | UMM Model | Definition | Required? |
---|---|---|---|
Temporal Extent | |||
Temporal Keywords | |||
Paleo Temporal Coverage |
Spatial Information Concepts:
Element | UMM Model | Definition | Required? |
---|---|---|---|
Spatial Extent | UMM-Common | Yes | |
Spatial Information | No | ||
Tiling Identification System | No | ||
Location Keywords | UMM-C | No |
Acquisition Information Concepts:
Element | UMM Model | Definition | Required? |
---|---|---|---|
Platform | UMM-Common | Yes | |
Instrument | UMM-Common | No | |
Project | UMM-Common | No |
URLs:
Element | UMM Model | Definition | Required? |
---|---|---|---|
UMM-Common | Yes | ||
Online Resource |
|
Descriptive Keyword Concepts:
Element | UMM Model | Definition | Required? |
---|---|---|---|
Science Keywords | |||
Ancillary Keywords | |||
ISO Topic Category | |||
Additional Attributes |
Metadata Information Concepts:
Element | UMM Model | Definition | Required? |
---|---|---|---|
Metadata Language | |||
Metadata Dates | |||
Directory Names |
Granule Specific Concepts:
Element | UMM Model | Definition | Required? |
---|---|---|---|
GranuleUR | |||
CollectionReference | |||
Identifiers | |||
Production Date Time | |||
Provider Dates | |||
Metadata Specification | |||
Archive and Distribution Information for Granules | |||
Cloud Cover | |||
Day Night Flag | |||
Grid Mapping Names | |||
Native Projection Names | |||
Input Granules | |||
Measured Parameters | |||
PGE Version Class | |||
Reprocessing Actual | |||
Reprocessing Planned | |||
Related URLs (Granules) | *Will probably combine with existing Related URLs UMM-Common page |
Additional Resources
Below are additional resources regarding the UMM and the CMR:
Unified Metadata Model:
Miscellaneous CMR Resources
- CMR Introduction
- Earthdata Search Engine
- Global Change Master Directory (GCMD)
- CMR API Search Introduction
- CMR API Documentation
- Analysis and Review of CMR (ARC) Introduction