The study of the Earth's gravitational field and its representation in a three-dimensional time-varying space by applying the rules of applied mathematics and Earth science is known as geodesy. It also includes the study of crustal motion, polar motion and the cause of tides. The methods used to measure these motions are gravimetry, geodetic astronomy, levelling, satellite geodesy, etc. This book elucidates the concepts and innovative models around prospective developments with respect to geodesy. Most of the topics introduced in it cover new techniques and the applications of the subject. For all those who are interested in the vast subject of geodesy, this textbook can prove to be an essential guide.