This course introduces you to Geometrical and Physical Geodesy. It reinforces your knowledge and skills about the concepts upon which the science of geodesy is based and the mathematical tools applied. It examines how terrestrial and increasingly space-based geodetic measurements and techniques are used to define, maintain and use global and local coordinate reference systems. The Earth's gravity field, and how it is used to define and relate gravimetric and geometric vertical reference surfaces, is investigated through the study of physical geodesy.