The GCMD keywords 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. Established Initiated over twenty years ago, these controlled GCMD keywords GCMD Keywords are periodically analyzed for relevancy and will continue to be refined and expanded in response to user needs. There are twelve sets The categories of GCMD keywordsKeywords are as follows. Keywords Keywords- Data Centers/Service Providers
- Projects
Instrument- Instruments/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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