Remote sensing has been used in terrain analysis for several decades in the form of conventional black and white aerial photographs. During the past decade or so, newer forms of remote sensing and improved methods of data analysis have become widely available. A number of texts now exist outlining the principles of remote sensing and their applications (see Ch. 2) and a somewhat smaller number has been published reviewing the principles of terrain analysis (see Ch. 1). As its name implies the present book is focused on the frontier zone between these two subject areas. Hopefully this book contains a more unified set of statements than the usual collection of essays bound in book-form: certainly this was our intention. Apart from our conscious efforts, two factors have helped achievement of this end. The authors have all spent a substantial part of their careers in a single university department, namely the Department of Geography in the University of Reading (with the exception of Alison Cook who spent only six months there) and, as this volumes dedication indicates, the authors owe much to the efforts of Professor R. A. G. Savigear who was primarily responsible for the development of remote sensing in the department.