First published in 1968 as Practical Field Surveying and Computations, this book has been completely rewritten by one of the original authors to reflect the profound changes in technology and its applications. The author has set out to retain the essential characteristics of the original book, including worked examples that explain the theory and can be used to check computer algorithms. With the introduction of electronic instrumentation and computerized data processing systems, today's surveyor's primary concern is quality control not only in avoiding blunders at the data-gathering stage but also in the ability to appraise computer output in the light of fundamental principles. The explanations and examples in the book are intended to equip readers to select those procedures and techniques that are most reliable, accurate, cost-effective and appropriate to the problem tackled.