A professional who studies size, shape, and gravitational field of earth. Responsibilities include:

• Employs surveying and geodetic instruments, such as transits, theodolites, and other engineering instruments, in setting up and improving network of triangulation over earth's surface, in order to provide fixed points for use in making maps.
• Establishes bench marks (known points of elevation).
• Performs gravimetric surveying to determine variations in earth's gravitational field, and provides data used in determination of weight, size, and mass of earth.