The fourth edition of this highly regarded and successful text continues to provide a clear and accessible introduction to the world of GIS for students and professionals. With an increased focus on the practical applications of GIS, the new edition features a wealth of new multi-disciplinary case studies and examples of GIS in practice, demonstrating how it is used worldwide and within a variety of different industries. Furthermore, the new edition has been substantially revised and updated to include coverage of the latest advances in GIS such as web and mobile applications. An Introduction to Geographical Information Systems is suitable for students of Geographical Information studies at all levels, from undergraduate to professionals retraining in GIS.