The document summarizes a workshop on using Shibboleth federations to securely access spatial data infrastructure (SDI) resources. It describes an interoperability experiment conducted by the Open Geospatial Consortium to test modifying open source clients to access web services secured by Shibboleth. Several organizations demonstrated desktop and browser-based clients accessing web feature and map services hosted in test identity federations. The experiment showed securing SDI resources with Shibboleth is practical and could help address cross-border data sharing challenges.