The third edition of this successful text continues to provide a clear, practical and accessible introduction to the world of Geographical Information Systems. A selection of new features helps to explain and demonstrate how GIS are actually used, across a variety of disciplines and within a range of industries. This edition is fully updated and includes coverage of the latest topics, such as web-based and mobile GIS. An increased focus is also placed on the practical applications of GIS to show their relevance and use within the world around us.