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The GCMD keywords are a hierarchical set of controlled Earth Science vocabularies that help ensure Earth science data and services are described in a consistent and comprehensive manner and allow for the precise searching of collection-level metadata and subsequent retrieval of data and services. Established over twenty years ago, these controlled GCMD keywords continue to be refined and expanded in response to user needs. There are twelve sets of GCMD keywords.

1. Earth Science Keywords
2. Earth Science Services Keywords
3. Data Centers
4. Projects
5. Instrument/Sensors
6. Platforms/Sources
7. Locations
8. Horizontal Data Resolution
9. Vertical Data Resolution
10. Temporal Data Resolution
11. URL Content Types
12. Chronostratigraphic Units

All requests for keyword additions, modifications, or other keyword related issues/questions should be sent to support@earthdata.nasa.gov 

To submit a keyword, the submitter should:

• Review the controlled keyword rules

• Verify that the keyword does NOT already exist

• Include a definition of the proposed keyword