The need to geo-spatial data in different applications particularly for knowledge-based sustainable
development is considerable. However, various problems encountered with production, dissemination and
accessing geo-spatial data makes users to face with many difficulties when intending to use them. Spatial Data
Infrastructure (SDI) is introduced as a solution to these problems. Success of an SDI strongly depends on
partnership among different parties at different administrative levels involved in SDI development, which
makes SDI to have a complex nature. The general SDI Hierarchy model tries to simplify the complexity of SDI
development. However, it is essential to expand this model in order to be adopted for specific initiatives at
the implementation phase. This paper proposes expansion of SDI Hierarchy for Iran as a country with
non-federated system. It also describes the concept and importance of Organizational SDI (OSDI) in developing
National SDI (NSDI).