In the wake of the so-called information technology revolution, many stakeholders from the public and private sectors (including citizens) have indeed grown accustomed to the promise and usability of spatial data infrastructures (SDI) for data access, use, and sharing. With contributions from international experts, this book presents cutting edge Spatial Data Infrastructure (SDI) research on information technology, systems, and infrastructures that is theoretically-based and empirically supported. It examines the complexities involved in the establishments of SDIs in the Northern and Southern hemispheres and use of SDIs in a variety of cultural, societal, and institutional contexts. The focus is on urban and regional levels where socio-economic and environmental sustainability is realized.