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
- Centers/Service Providers
- Projects
- InstrumentsInstrument/Sensors
- Platforms/Sources
- Locations
- Horizontal Data Resolution
- Vertical Data Resolution
- Temporal Data Resolution
- URL Content Types
- Granule Data Formats
- Measurement Names
- Chronostratigraphic Units
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