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Why is discovery metadata important? Data can only be useful and used if it can be found.

Why is a metadata standard important? Publishing your metadata in a recognised standard inspires trust, enables new services, and opens up international opportunities.  

“GEMINI” is the UK geographic metadata standard. It provides guidance on how to publish geographic metadata in a way that conforms to relevant ISO standards and the UK’s implementation of the European INSPIRE regulations.

UK GEMINI (GEo-spatial Metadata INteroperability Initiative) is a specification for a set of metadata elements for describing geospatial data resources. It has been produced and is maintained by the Standards Committee. It is provided free of charge by the AGI for the benefit of the GI community, under a Creative Commons license.

If you're thinking, "why GEMINI? Why not just use the INSPIRE Metadata guidance or the ISO standards?" Click here for some reasons.


The AGI Standards Committee published version 2.3 of UK GEMINI in June 2018.


This revision incorporates material prepared by the UK Location Programme, previously published at, and material previously published as separate guidance documents. We hope this consolidation will make it easier for you to use. GEMINI has also been updated for change requests from revised INSPIRE guidance and UK users.  The AGI is grateful to Defra for funding part of this work, and for several AGI members also contributing.

The existing guidelines on the quality of metadata still apply: Guidelines for UK GEMINI Part 3 Metadata Quality

UK INSPIRE announced their intention to require data publishers to migrate to GEMINI 2.3 by December 2019, in line with the target date from Europe for adopting the current version of their INSPIRE Technical Guidance. However, technical implementations have been delayed. UK INSPIRE, and the system in particular, will continue to accept GEMINI 2.2 records encoded according to UK Location guidance, at least until then - although they may generate warning messages from the EU portal.

MEDIN and Astun Technology have written case studies on their experiences implementing GEMINI 2.3:

GEMINI 2.3 does not include any changes related to the publication of ISO 19115-1:2014; GEMINI remains based on ISO 19115:2003.

Previous version: 2.2,  published December 2012

Version 2.2 of UK GEMINI2 included changes requested by the UK Location Programme Metadata Working Group resulting from the implementation of the national geospatial metadata service.

  • UK GEMINI Standard v2.2

  • Guidelines for UK GEMINI Part 1 Introduction, which covers the basics of metadata

  • Guidelines for UK GEMINI Part 2 Creating Metadata using UK GEMINI, which provides a set of detailed guidelines for compiling UK GEMINI metadata elements.

  • Guidelines for UK GEMINI Part 3 Metadata Quality, which deals with metadata quality and covers quality evaluation and quality management of metadata including guidance on establishing acceptable quality levels.

Comments on UK GEMINI including suggestions for further developments, or on the Guidelines, may be submitted This email address is being protected from spambots. You need JavaScript enabled to view it..


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