This book constitutes the proceedings of the 11th International Symposium on Web and Wireless Geographical Information Systems, W2GIS 2012, held in Naples, Italy, in April 2012. The 13 full and 4 short papers presented in this book were carefully reviewed and selected from 32 submissions. The papers are organized in topical sections named, 3D and multimodal spatial interaction, positioning, spatial human-computer interaction, trajectory analysis, geo semantics, and sensor networks.