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This book, enriched with maps and figures, deals with the concepts and business opportunities of geographical information system (GIS). Explaining the basic concepts of GIS, it discusses at length the data structure and software as well as hardware options. Also, it explores the role and application of GIS technology in state and local governments, water and wastewater utilities, health and human services, retail and commercial business, transportation, tele-communication, mobile location services, electricity and gas utilities, public safety, law enforcement and criminal justice, defence, and decision support system. The present status of GIS in India has been evaluated as well. About the Author Dr. Nag has been author of nearly hundred research papers and several publications. His latest books are Population, Settlement and Development in Zambia, Geography of India and Digital Remote Sensing. He has been UN consultant in Census Cartography in Oman. At present he is the Director of the National Atlas & Thematic Mapping Organisation, Calcutta.