Ground-penetrating radar is a near-surface geophysical technique that can provide three-dimensional maps and other images of buried archaeological features and associated stratigraphy in a precise way. This revised edition, by the expert in the field, provides the basics of the physics, chemistry, geology, and archaeology in a clear fashion, unburdened by complex equations or theory. Additions to the forth edition include: -Updates to recent hardware and software advances in three-dimensional antenna array systems and antenna offset technology; -Expanded data processing methods that explains how to get more from your raw data, with examples to show why this is necessary and the results obtained; -Expanded examples from around the world and in various environmental settings that explains how non-traditional data analysis steps can provide clarity to results in ways that are not usually done with traditional. The reader will be able to understand how the latest equipment and software and the results of data collection and processing can be used effectively in a number of different settings. Both potential pitfalls and successes and the reasons for them are discussed. With over 100 images and important tables and graphs, this book is a useful reference in the field and for data processing in GPR.