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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. Initiated over twenty years ago, the GCMD Keywords continue to be refined and expanded in response to user needs. The sets of GCMD Keywords are as follows.

• Earth Science

• Keywords                                                                 
• Earth Science Services Keywords            

• Data Centers                                             
• Projects                                                     
• Platform/Instrument/Sensors                     
• Locations
• Horizontal Data Resolution
• Vertical Data Resolution

• Temporal Data Resolution

• URL Content Types

• Chronostratigraphic Units