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The Global Change Master Directory (GCMD) Keywords are a hierarchical set of controlled Earth Science vocabularies that help ensure Earth science data, services, and services variables are described in a consistent and comprehensive manner and allow for the precise searching of collection-level metadata and subsequent retrieval of data, services, and servicesvariables. Initiated over twenty years ago, the GCMD Keywords are periodically analyzed for relevancy and will continue to be refined and expanded in response to user needs. The sets categories of GCMD Keywords are as follows.

• Earth Science Keywords                                                                 
• Earth Science Services Keywords            
• Data Centers                                             
• Projects                                                     
• Instrument/Sensors
• Platforms/Sources                    
• Locations
• Horizontal Data Resolution
• Vertical Data Resolution
• Temporal Data Resolution
• URL Content Types
• Chronostratigraphic Units
  
  

To submit a keyword request (addition or modification) the submitter should:

1. State the proposed keyword
2. Provide a definition of the keyword
3. State the rationale for the keyword addition or modification

4. Review the keyword requirements (criteria used when determining what constitutes a well-curated keyword list)
   

5. Verify that the keyword does not already exists by checking the keywords in the Keyword Directory and search for the keyword

Once the above steps have been completed, submit the request to support@earthdata.nasa.gov. or post to the forum.The submitter will be notified of their submission status and when the keyword change has been made.

Other keyword issues/questions should be posted to the keyword forum.