This document discusses spatial data infrastructure (SDI) technologies and implementation patterns. It provides examples of SDI implementations at various geographic levels from local to global. It also describes how SDI can address issues like environment, social issues, and economics. The document highlights the INSPIRE initiative as an example of an SDI and how ArcGIS can be used to support INSPIRE. It discusses how SDI is evolving with new technologies and patterns like GIS online to make spatial data and services more accessible to a wider audience.