Global Change Master Directory (GCMD)

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Global Change Master Directory (GCMD)
Mission To assist the scientific community in
the discovery of Earth science data, related
services, and ancillary information, which
includes descriptions of instruments and
platforms. Our primary responsibility is to
provide descriptions of NASA resources and
provide NASA scientists a comprehensive and high
quality database to reduce overall expenditures
for scientific data collection and dissemination.
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GCMD Meeting Obligations to the Community
Metadata Sharing and Linkages to Data Systems
April 2010
NASA
Non-NASA
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International Directory Network (IDN)
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Multiple Entry Points for Discovering Earth
Science Data and Services
Keywords
NASA Data
Data Services
Data Centers
Instruments
Map/Date Search
Projects
Platforms/ Sources
Location Name Search
Full-text
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Controlled Keyword Sets

• Science Keywords
• Services Keywords
• Locations
• Instruments
• Platforms
• Spatial/Temporal Data Resolution Range
• Visualization Type
• Analysis Type

• URL_Content Type
• Chronostratigraphic Units
• ISO Topic Category
• Data Set Language
• Data Centers
• Personnel
• Projects
• Authors may create new entries, but software
  checks for uniqueness consistency.
• Unique Entry_IDs are also assured.
• Required

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Five-Level Keyword Hierarchy
Variable Level 2
Variable Level 1
Term
Variable Level 3
Topic
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Data Service Descriptions

• Describe Earth science related tools, software,
  and services.
• Relate to the processing, viewing, analysis,
  archival, retrieval, production, interpretation,
  acquisition, modeling, visualizing, formatting,
  or indexing of Earth science data.
• Provide a link between services and associated
  data set descriptions.

Data Service Population by Keywords
Data Services Interface
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Contributing Earth Science Data and Service
Descriptions
Tools for Creating, Validating, and Submitting
Information About Your Data Set or Service.
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Metadata Submission, Validation and QA

• Validation (controlled fields and syntax)
• Science staff - metadata coordinators
• Partnership between coordinators and data
  providers

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Link Checker/Editor

• Internal Web-Based Tool (developed to fix
  EOSDIS links).
• Scans the entire GCMD metadata collection (2
  times a month).
• Provides reports of broken and redirected URLs
  based on scans. Reports are also available as a
  text file and can be distributed to metadata
  providers.
• Permits internal users to update broken links
  directly in the metadata.
• Caches all web pages to provide a reference in
  case a site is extinct.
• Implemented in docBUILDER to warn users of
  broken links at validation.

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Focus on Quality of Metadata Content
Focus on Quality of Metadata Content
Revised, New, and deleted DIFs
Revised, New, and deleted SERFs
Revised, New, and deleted SERFs
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Our Users Occupation
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Website Usage Over Time
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Directory Population Over Time (1999-2009)
24,000
Current Population Data Sets 22,508 Data
Services 2,194 Climate Diagnostics 203
20,000
16,000
Population Value
12,000
8,000
4,000
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GCMD Portal Collaborations
Portals are subset views of the directory,
allowing organizations to maintain and document
their contributed data set and services
descriptions.
http//gcmd.nasa.gov/Data/portal_index.html
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Portal Growth (1999-2009)
Number of Portals
Year
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CEOS Climate Diagnostics Climate Visualizations
for Environmental Decision Making
The Climate Diagnostics directory offers climate
diagnostic visualizations that can be easily
interpreted by decision makers. This site is
designed to enhance the Global Earth Observation
System of Systems (GEOSS) by providing these
visualizations of climate trends and variability.

Users can search by controlled Earth science
keywords, Essential Climate Variables (ECVs),
Societal Benefit Areas (SBAs), or through a
full-text search. Controlled location keywords
and a Google map are also available to query on a
location of interest.
Choose Add Climate Diagnostics to contribute
visualizations.
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Code 610 Portal (mockup)
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Science User Working Group Meeting June 2-4,
2010 Building 34