This book constitutes the refereed proceedings of the 7th International Symposium on Web and Wireless Geographical Information Systems, W2GIS 2007, held in Cardiff, UK, in November 2007. The 21 revised full papers presented were carefully reviewed and selected from 45 submissions. The papers provide an up-to-date review of advances in recent development of Web and wireless geographical information systems, and address a broad range of issues like conceptual and logical models for W2GIS.