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This lecture covers the fundamentals of geodesy, focusing on coordinate systems, geoid, and ellipsoid. The instructor explains projection systems, geodetic references, and the physical model of the geoid. Topics include the relationship between gravity intensity and mass distribution, equipotential surfaces, and the concept of equipotential. The lecture also delves into coordinate transformations, national coordinates, and the representation of the earth's surface on a plane. Additionally, it discusses the importance of the geoid and ellipsoid in geodesy, as well as the challenges of representing a spherical surface on a flat plane.