This tutorial provides an overview of the fundamental concepts and components of RIEDP (Reuse and Interoperation of Environmental Data and Processes), developed within the Simulation Interoperability Standard Organization (SISO).  The focus of RIEDP is on the harmonization of environmental/terrain database generation processes, and the means to exchange such generated data. RIEDP promotes reusability of database generation efforts and fosters interoperability between simulations by providing standardized rules, methods, and semantics for sharing data from key stages of the simulation database generation process.  RIEDP leverages existing source data formats commonly used in GIS and simulation applications. RIEDP concepts and components are embodied in two SISO products: the RIEDP Data Model Foundations and the RIEDP Detailed Features Description. The tutorial will highlight key concepts from these RIEDP specifications and will provide an overview of the RIEDP Reference Process Model (RPM), the RIEDP Reference Abstract Data Model (RADM), and how RIEDP uses existing formats and a robust approach (including semantics through attributes and attribution, innovative and efficient use of metadata constructs, data organization on media, and a set of profiles for specific application sub-domains) to share and exchange environmental data.