The report "Value of Open Datra Sharing is available to download. The report was produced by CODATA specifically at the request of the GEO Secretariat in order to summarise arguments in favour of broad and open data sharing.

you can find more information on the report, which is also available to download here

Abstract

The Members and Participating Organizations of the Group on Earth Observations (GEO) make their Earth observation and environmental data available through the GEO Global Earth Observing System of Systems (GEOSS) portal. The preferred approach of the organization is to provide open access and unrestricted use to those data through the GEOSS Data-CORE (Collection of Open Resources for Everyone). This approach has not been adopted by all the GEO participants, despite the call for even greater openness that is promoted by the revised GEO Data Sharing Principles for next decade.