A set of controlled keyword best practices are a governance criteria used when determining what constitutes a well-curated keyword list. Below is a list of best practices.
- Keywords should be applicable to an established science discipline and practical to a broad range of users and metadata providers.
- Keywords should be composed of conventional terminology that is functional and understandable by the international community.
- Keywords should not overlap with keywords that already exists.
- Keywords that are frequently searched in free-text, but not part of the existing controlled keywords are candidates for inclusion into the controlled keywords.
- Keywords that are commonly populated in the Detailed Variables and Ancillary Keywords will be considered for inclusion into the controlled keywords (ex: the Detailed Variables and Ancillary Keywords can be moved into one of the existing Variable Levels).
- Keywords should only be considered if applicable to existing or forthcoming Earth science data/metadata (ex: new project, instrument, mission, or collaboration).
- Keywords will be periodically analyzed for relevancy and be updated or deprecated as needed.
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