Spatial data infrastructures (SDIs) are being established across the globe in the most diverse political, institutional, and legal settings. The ultimate objectives of the SDI initiatives are promoting economic development, stimulating better cooperation and government, and fostering environmental sustainability. The book provides an overview of SDI policies, concepts, and practices associated with the design and implementation of an SDI to support spatially enabled societies. Technical aspects such as standards, networks, metadata, and clearinghouse concepts focus on developed and developing countries.