#  Controlled Vocabularies 

 



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 ![Lines criss-crossing to form a network.](/sites/g/files/omnuum1806/files/wolbachlibrary/files/lines_shape-essi_header.jpg)

 

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[Earth and Space Science Informatics](https://connect.agu.org/essi/home). AGU.  


Wolbach Library develops and curates two controlled vocabularies to support the information needs of the international astronomy community: [*The Unified Astronomy Thesaurus*](/unified-astronomy-thesaurus "Unified Astronomy Thesaurus") and [*MetaSat*](/metasat "MetaSat").

Each vocabulary contains machine-actionable identifiers for important concepts that represent different aspects of the field. These identifiers can enable:

- Search Engine Optimization (SEO)
- Federated search across platforms via APIs
- Linked data applications

Our vocabularies are hosted by our colleagues at the [Australian Research Data Commons](https://ardc.edu.au/).