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The NASA Global Change Master Directory (GCMD) staff is pleased to announce the release of the GCMD keywords version 9.1. Version 9.1 consists of 5 new keyword schemes: (1) Projection Name (2) Projection Authority (3) ChainedOperations (4) Operations (5) ProjectionDatumNames. These new keyword schemes are in support NASA's Unified Metadata Model for Services (UMM-S).

The keywords help facilitate the classification and discovery of Earth Science data by providing a rich vocabulary for characterizing the data. The GCMD keywords are used by hundreds of data providers worldwide for categorizing the ~33,000 records stored in the Common Metadata Repository.

For more information about the keywords and how to access them, please visit the Keyword Landing Page. Questions about the keywords can be submitted to or directed to Valerie Dixon at

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