Proven through three highly praised editions, The GIS Book, Fourth Edition is a completely revised and greatly expanded resource for anyone who needs to understand what a geographic information system is, how it applies to their profession, and what it can do. New and updated topics include trends toward CAD/GIS convergence, the growing field of systems developers, and the latest changes in the GIS landscape. New case studies tie text to real life scenarios, and expanded appendices offer the latest resources including associations and events, published material and videos on GIS, consultants and trainers, educational institutions, and the Internet.